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https://thesynesthesiatree.com/2021/04/blog-post.html
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 WELCOME TO THE SYNESTHESIA TREE!

 


This is an encyclopedic website of types of synesthesia and synesthesia knowledge in general. It has lists, tables and browsing tools to help you find the type you're looking for, more than 100 information pages on specific types, manifestations etc. with real examples and descriptions, and other pages with information on all aspects of the subject, useful links, etc.

Go to the

ALPHABETICAL
LIST OF
SYN TYPES




find yourtype of synesthesia hereo
Go to the

TABLE OF
SYNESTHESIA
TYPES




by
combinations
of senses
o Go to the

SYNESTHESIA
TYPES BY
PREVALENCE




from most
to least
common
o


Step-by-step: click answers to brief questions and it will lead you to your type


SITE MAP (A LIST OF ALL THE PAGES IN THE SYNESTHESIA TREE)

Or you can search the whole site here:

The Synesthesia Tree works in symbiosis with the Synesthesia subReddit to improve and enrich both sites, and collaborates with Journey Through The Senses, Daniel Schüster's neurodiversity and event website.
Also on this site:

Information pages:  All about synesthesia · Why it is impossible to say how many types of synesthesia there are? · The most common types of synesthesia · What are the rarest types of synesthesia? · Do I have synesthesia? · The neurological basis for synesthesia · Books about synesthesia · Artists with synesthesia · Facebook groups · Synesthesia Associations · About the Author (who created this site and why)

Brief definitions: Synesthesia · Inducer/concurrent ·  Projectors/associators; projective/associative · Photism · Ideasthesia




The name of this website with the British English spelling would be "The Synaesthesia Tree".


Website last updated (in general): 15 May 2026

This page last updated: 6 April 2026


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TYPES OF SYNESTHESIA IN ALPHABETICAL ORDER
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There are numerous types and subtypes of synesthesia, which can manifest in different ways. This page provides an alphabetical list to help you find the type, subtype or manifestation you are looking for. The links lead to just over a hundred different pages on the Synesthesia Tree with more detailed information on each type and real-life descriptions by people who experience it. Some phenomena that are similar but not considered synesthesia are also included on the list. 
Find your type here!
This list is designed for searching and browsing and it contains a variety of different keywords and terms that sometimes lead to the same pages. For a shorter, more schematic list of synesthesia types you can visit the Site Map or the Tables, all linked on the side bar.
For more information on how the Alphabetical List works, see the end of this page.
Acupuncture-colour/shape (tactile-visual) (not always synesthesia)Alphabet form (alphabet spatial sequence synesthesia)ASMR (not considered synesthesia; for similarities/differences see auditory-tactile)Audio-tactile synesthesia 
Audio-motor (see either lexical-motor or auditory-motor/sound-to-kinetics synesthesia)
Auditory-gustatory synesthesia
Auditory-motor synesthesia (hearing sounds produces involuntary movements)
Auditory-olfactory synesthesia
Auditory-tactile synesthesia
Auditory-visual synesthesia
Aura synesthesia (projective personality-colour)Autobiographical time-colour
Calendar synesthesia (time units-spatial location)
Cardinal points-colour
Centuries-colour  
Chord-colour (musical chords) 
Chord-taste (musical chords) 
ChromesthesiaCities or towns-colour
Coloured hearing
Coloured numbers
Coloured lettersColoured sensations
Coloured sequence synesthesia (colour associations for sequences of things)
Colour-graphemic or colour-grapheme (= grapheme-colour)
Colour-emotion (not considered synesthesia) 
Colour-musical notes (colour-tone synesthesia)Colour-numbers
Colour-odd or even
Colour-personality or gender 
Colour-smell 
Colour-sounds 
Colour-tactile sensations 
Colour-taste  
Colour-tones (musical notes)
Concept-colour 
Concept-shape 
Concept-smell Concept-sound Concept-spatial positioning Concept-taste 
Countries-colour 
Cutlery personification
Dance steps-colour (as a coloured sequence or as kinetics-colour synesthesia)
Days of the week-colour
Days of the week-colour/shape/texture
Days of the week-personality
Days of the week-image (mentioned in time units-colour)Days of the week-spatial locationDays of the week-taste or smell
Decades-colour 
Dichotomy or Duality (concepts are masculine/feminine, heavy/light, round/sharp etc.)
Emotion as a synesthetic concurrent (not usually considered synesthesia)Emotionally mediated synesthesia
Emotions observed in other people-colour/shape/smell/taste/sound/touch
Emotion-colour/shape/texture/image 
Emotion-smell 
Emotion-sounds  Emotion-tactile sensations 
Emotion-taste Emotion-texture 
Empathy with machines
Feeling physical pain on seeing or hearing about others hurt (but not in the same part of your body)
Feeling touch, pain etc. in the same part of your body when you observe it in othersFeelings or vibes as a synesthetic concurrentFigurative images as a synesthetic concurrent
Fingers-colourFlashes on hearing sudden or loud sounds when falling asleep (not considered synesthesia)
Flavour (see taste)Flow state images
Gender as a synesthetic concurrent (concepts, letters, numbers, etc. are masculine or feminine)
General sounds-colour (and/or shape)
Geometric shapes-colourGeometric shapes-numbers
GIFs (motion)-sound
Grapheme-colour synesthesia
Grapheme-shape/texture/colour/image
Grapheme-smell
Grapheme-soundGrapheme personification (see either ordinal linguistic personification, letter personification or number personification)Grapheme-tactile
Grapheme-taste
Grapheme-temperature
Gustatory-auditory synesthesia
Gustatory-olfactory (not considered synesthesia)
Gustatory-tactile synesthesia
Gustatory-visual synesthesia
Hearing GIFs
Hearing motion (hearing sounds when you see things moving)Hearing smells
Hearing sounds for numbers
Hearing the taste of food
Hearing your own body movementsHigh-production synesthesia
Ideasthesia (or ideaesthesia) (not a type of synesthesia but an alternative way of defining it)Ideas-abstract shapes, spatial positioning, vision
Images (figurative, not abstract) as a synesthetic concurrentImages perceived on learning/playing a musical instrumentImages seen in creative/musical tranceImages - smelling or tasting them
Involuntary movements in response to sounds
Key signature-colour (in music)
Kinetic synesthesia (or kinesthetic synesthesia)
Kinetics-colour
Kinetics-soundKissing-colours or images
Languages-colour 
Learning to play an instrument-imagesLeft/right-colourLetter form synesthesia (letters have a spatial location)
Letters-colour 
Letters-colour/shape/texture/imageLetters-gender
Letters-personality 
Letters-smell/taste  
Letters-sound 
Letters-spatial locationLetters-tactile sensations
Letters-temperature
Lexeme-colourLexeme-taste (mentioned in lexical-gustatory)
Lexical-gustatory synesthesia
Lexical-motor synesthesia
Lexical-olfactory synesthesiaLexical-tactile synesthesia
Machine empathy, machine synesthesia (machines/objects induce tactile sensations if watched)
Massage-colour/shape/image (tactile-visual)Mathematical concepts-vision
Mathematical synesthesias
Mirror kinetics (mirror movements, involuntary movements on seeing other people move)  Mirror pain  
Mirror speech  
Mirror touch
Mirror touch with machines or inanimate objectsMixed perceptions or concurrents, multi-sensory synesthesia
Misophonia (not considered synesthesia)
Months-colour  Month-colour
Months-colour/shape/texture
Months-personality
Months-spatial location
Morpheme-colourMotion-colour
Motion-sound (watching things move makes you hear sound)Motor synesthesia
Movements of your own body-colourMovements of your own body mirroring movements made by other people
Movements of your own body-sound
Music (all music-related types of synesthesia)Multiple perceptions or concurrents, multi-sensory synesthesia
Musical genres-colour
Musical genres-smell
Musical genres-taste
Musical instruments-colour and/or shapeMusical keys-colourMusical modes-colour
Musical notes-colourMusical notes-numbers
Musical notes-smell
Musical notes-tasteMusical notes-texture
Musical synesthesias (all the different types)
Music-colour
Music-emotion (not considered synesthesia)
Music-images, landscapes or “music videos” (not considered synesthesia)Music-numbers
Music-smellMusic-tactile sensations
Music-taste
Music-temperature
Music-visionNames (proper nouns)-imagesNames (proper nouns)-actions/movement
Number form synesthesia (numbers have a spatial location)Numbers as a synesthetic concurrent
Numbers-colour
Numbers-genderNumbers-personality
Numbers-shape/colour/texture-image
Numbers-smell or taste
Numbers-sound
Numbers-spatial locationNumbers-tactile sensations
Numbers-temperatureObject personification (only considered synesthesia in certain cases)
Objects are odd or even
Objects have personalitiesOdd and even: concepts are either odd or even
Odour (see smell)
Olfactory-auditory synesthesia
Olfactory-gustatory (not considered synesthesia)
Olfactory-tactile synesthesia
Olfactory-visual synesthesia
OLP (= ordinal linguistic personification)One-shot synesthesia
Ordinal linguistic personification
Orgasm-colour/images
Pain empathy (not usually considered synesthesia)
Pain-colour/shape/image
Pain-smell
Pain-sound
Pain-taste
Parity (odd or even) as a synesthetic concurrent
Parts of the body-colourPerceived emotion-colour (and other concurrents)Perceived pain-colour
Person-colour synesthesia Person-sound Personality-colourPersonality-number
Personality-smell
Personality-taste
Personification
Personification of colours
Personification of cutlery
Personification of days or monthsPersonification of graphemes (see either ordinal linguistic personificationletter personification or number personification)
Personification of letters
Personification of musical notes, chords or keys
Personification of numbers
Personification of objects
Personification of musical sounds or sequencesPhases of your life-colour
Phonemes-colourPhonemes-taste (mentioned in lexical-gustatory) Pitch-colourPitch-texturePlaying a musical instrument-imagesProper nouns-imagesProper nouns-actions/movementRight/left hand-colourScales (musical modes)-colour
School subjects-colour 
Seasons of the year-colour Seeing "auras" around peopleSeeing flashes on hearing sudden or loud sounds (not considered synesthesia)Seeing ideas and thoughtsSeeing images when in a creative/musical trance
Seeing landscapes, figurative images or “music videos” when listening to music (not considered synesthesia)
Seeing music or sound
Seeing time units, letters or numbers in a spatial locationSeeing sequences of concepts in a spatial location
Seeing smells
Seeing tastes
Seeing touch, pain etc. in other people and feeling it in the same part of your body
Seeing words (like subtitles) when people speakSensations-colour or visual perceptionsSequence-colour
Sequence-spatialSequences of concepts-smell or tasteSequences of concepts-sounds
Sequence-personality or sequence personification
Sexual synesthesia; sexual and romantic synesthesiaShapes-colourShapes-numbers
Sight as a synesthetic inducer
Smell-emotion: see Emotion as a concurrent or Smell and memories (not considered synesthesia)Sight-smell: see either smelling images or concept-smellSight-taste: see either tasting images or concept-tasteSmelling colours (colours trigger smell perceptions)
Smelling images
Smelling music or sound
Smelling numbersSmelling personalities
Smelling sequences of concepts
Smelling words
Smells-colour 
Smells-memories (not considered synesthesia)
Smells-musical notes or sounds
Smells-shape 
Smells-sound 
Smells-tactile sensationsSmells-vision 
Smell-taste (not considered synesthesia)
Social synesthesia
Songs-colour 
Songs-smell 
Songs-taste
Sounds-colour Sounds-emotion (not considered synesthesia)Sounds-personification 
Sounds-physical sensations
Sounds (sudden or loud) produce visual flashes (not considered synesthesia)
Sounds-shape 
Sounds-involuntary movements Sounds-kinetics Sounds-numbers
Sounds-smell 
Sounds-tactile sensations (sound-touch)
Sounds-taste 
Sounds-temperature 
Sounds-texture 
Sounds-visual perceptions 
Spatial sequence synesthesia
Spatial sequences of letters
Spatial sequences of numbers
Spatial sequences of other conceptsSpatial sequence of time units
SSS (= spatial sequence synesthesia)Stimulus-dichotomy synesthesia (concepts belong to one of two groups)
Stimulus-parity synesthesia (concepts are odd or even)
Subtitles (ticker tape synesthesia)
Swimming styles-colour
Tactile-auditory synesthesiaTactile-colour (and shape/image)
Tactile-emotion synesthesia
Tactile-gustatory synesthesia
Tactile-olfactory synesthesia
Tactile-visual synesthesia
Taste-colour synesthesiaTaste-memories (not considered synesthesia)
Taste-musical notes 
Taste-shape 
Taste-smell (not considered synesthesia)
Taste-sound synesthesia 
Taste-tactile sensations
Taste-visionTasting colours (colours trigger taste sensations)Tasting imagesTasting personalities
Tasting sequences of conceptsTasting sound or musicTasting wordsTemperatures associated with letters or numbersTemperatures associated with sound or music
Texture-colour/shape/image Texture-emotion synesthesia Texture-smell or taste Texture-sound Thinking in shapes; thoughts or thought processes-shapes/colours 
Ticker tape synesthesia
Timbre-colour synesthesiaTimbre-shape synesthesia
Time units-colour
Time units-image (mentioned in time units-colour)Time units-spatial locationTime units-personification
Time-space synesthesiaTone-colour (musical note-colour)Tone-taste (musical note-taste)Tone-texture (musical note-texture)Touch-colour (and shape/image)Touch (texture)-emotion
Touch-smell
Touch-sound
Touch-tasteTouch-sight
Towns or cities-colourVibes or feelings as a synesthetic concurrent
Vicarious pain (not normally considered synesthesia)
Vision as a synesthetic inducerVisualised sensations
Visually-induced auditory synesthesiaVisual-olfactory synesthesia (vision-smell): see smelling imagesconcept-smell or colour-smellVisual-gustatory synesthesia (vision-taste): see tasting imagesconcept-taste or colour-tasteVisuo-spatial synesthesia
Voice-colour 
Voice-shape 
Voice-smellVoice-tactile sensations 
Voice-taste 
Words appear visually when hearing people talk
Words-actions, words-movement, perceiving moving images or attitudes Words-colourWords-flavour  Words-imagesWords-involuntary body movementsWords-odd or even
Words and letters-shape/texture/colour/images
Words-smell 
Words-tactile sensationsWords-taste 
Words-temperature
Years-colour 
Years-spatial location

About this Alphabetical List 
This alphabetical list includes types and subtypes of synesthesia and some of its common manifestations. There are also some phenomena that are similar but not considered to be synesthesia. 
Click on any entry to go to a page in the Tree with information on that particular type. 
The list has more than 300 entries, but they don't all lead to separate pages and it doesn't mean there are 300 types of synesthesia! They lead to just over 100 different pages. The number of types of synesthesia that exist can't be quantified with a number, for various reasons (see this page if you'd like to read about why: Why is it impossible to say how many types of synesthesia there are?).
This alphabetical list is long because it's designed for scrolling, and sometimes the terms are referenced in several different ways, to make it easier for you to find what you’re looking for because people think of and search for their experiences using different words. And also because the types of synesthesia often have more than one name. 
Remember that in the terms with a hyphen, the “inducer” or stimulus comes first, followed by the “concurrent” or secondary synesthetic perception, so for example "Taste-colour" is when tasting something makes you experience a colour, not the other way round.
If you prefer a shorter, more schematic list to find specific types of synesthesia, you can search in the Site Map (with a list of all the pages on this site, grouped by synesthesia types and key words, shorter and easy to navigate). Other pages you might prefer are the List of Synesthesia Types by Prevalence or the Table of Synesthesia Types by Combinations of Senses. If you go to the Home Page you can get an overview of all these.
Another way to quickly find what you're looking for is the Synesthesia Finder tool, where you answer brief questions and it will lead you to the page you need. It's ideal if you have experiences with crossings of the senses or other experiences that seem to fit into some category of synesthesia, but it would be difficult for you to name them.
If you're searching in this Alphabetical List (or anywhere else on the Tree site) here's a note about the spelling. Although I write in British English, I always use the word "synesthesia" in its international or USA spelling without the "a" (in British English it's spelt "synaesthesia", and both spellings are correct of course.) But I spell all other words in British English on the Tree site, so you'll find "colour" and not "color", for example. That's just personal preference!

This page last updated: 14 April 2026


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TABLE OF SYNESTHESIA TYPES (by combinations of senses)
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This page contains a large table of types of synesthesia organised by combinations of the different senses (plus some additional inducers and concurrents that are related with concepts rather than senses). Click on any link to go to the page on each type, where you will find a full description and examples provided by people who have this type.
Note: the table does not list all the existing types of synesthesia (and it isn't a complete list of all the pages on this website), it's just a useful route for finding information on this site if you're searching by the different crossovers.

Why is it impossible to list all the types of synesthesia that exist?  

Concurrents
                 →
↓ Inducers

Sight

Hearing

Touch

Taste

Smell

Other sensations   
Personification
Spatial position

Parity

 

Sight

(Note: for more

visual inducers,

see “sequences

of concepts”

below)

Colour-sound

 

Colour-tactile

Mirror touch

Machine empathy 

Colour-taste

 

Colour-smell

 

 


 

 

 

 

 

 

Hearing

(Sight)

Auditory-visual

Including:

Chromesthesia

Tone-colour

Chord-colour

Song/musical genre-colour

Timbre-colour/shape

Key signature-colour

Musical modes-colour

General sounds-vision

Voice-colour/shape

Ticker tape

Phoneme-colour

 

(Touch)

Auditory-tactile

Mirror speech

Sound-texture

(Taste)

Auditory-gustatory

Including, among others:

Tone-taste

Chord-taste

Song/musical genre-taste

Voice-taste

(Smell)

Auditory-olfactory

The types included are described on the page on auditory-olfactory synesthesia

(Other)

Auditory-motor

Music-temperature

Sound-texture

Musical note-texture

(Personification)

Personification of musical sequences

 

 

 

  

Touch

(Sight)

Tactile-visual

(Hearing)

Tactile-auditory

 

(Taste)

Tactile-gustatory 

(Smell)

Tactile-olfactory

 

(Other)

Tactile-emotion

 

 

 

 

  

Taste

(Sight)

Gustatory-visual

 

(Hearing)

Gustatory-auditory

 

(Touch)

Gustatory-tactile

 

 

 

 

 

 

 

  

Smell

(Sight)

Olfactory-visual

 

(Hearing)

Olfactory-auditory

 

(Touch)

Olfactory-tactile

 

 

 

 

 

 

 

 

 

Other

sensations

(Sight)

Pain-colour/shape

Emotion-colour/shape

Perceived emotion-to-colour/shape

Sexual (and romantic) synesthesia

Kinetics-colour

(Hearing)

Pain-sound

Motion-to-sound

Kinetics-sound

Emotion-sound

Perceived emotion-sound

 

(Touch)

Emotion-tactile

Perceived emotion-tactile

 

(Taste)

Pain-taste

Emotion-taste

Perceived emotion-taste

 

(Smell)

Pain-smell

Emotion-smell

Perceived emotion-smell

 

 

 

 

 

 

 

Sequences

of

concepts

(Sight)

Time units-colour

Coloured sequences

Concept-shape

Mathematical concepts-vision

Grapheme-colour

Lexeme/ morpheme-colour

Person-colour

Personality-colour

(Hearing)

Grapheme-sound

Concept-sound


 

 

 (Touch)

Grapheme-
tactile


Lexical-tactile

(Taste)

Lexical-gustatory

Grapheme-taste

Personality- taste

Concept-taste

 

 

(Smell)

Lexical-olfactory

Grapheme-smell

Personality-smell

Concept-smell

 

(Other)

Lexical-motor

Grapheme-temperature


 

(Personification)

Ordinal linguistic personification

Personification of days or months

Colour personification

Personification of sequences of objects

 

(Spatial)

Spatial sequence

Its subtypes are:

Calendar synesthesia

Number form

Alphabet form

Spatial sequences of other concepts

(Parity)

Stimulus-parity

Duality

 

Concurrents
                →

Sight

Hearing

Touch

Taste

Smell

Othersensations

Personification

Spatial position

Parity


This page last updated: 30 March 2026

The UK spelling is "Table of synaesthesia types by combinations of senses"
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LIST OF SYNESTHESIA TYPES BY PREVALENCE
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This page contains a table of the different types of synesthesia grouped by the types that are the most common, less common, more infrequent and rare. All the types in the table are linked to the respective pages on this website with more detailed information and specific descriptions.

The percentages are very approximate and are based on the existing studies and on personal intuition in the cases for which there are no figures available. They refer to the percentage of the synesthetic population that could have each type. The synesthetic population probably consists of around 4% of the general population.

Within each of the four boxes, the types of synesthesia are ordered alphabetically, not from more to less common.

*Marked with an asterisk: as I have not been able to find any conclusive studies, I have taken the liberty of making an estimate based on what I have read and observed over the last few years.

**Marked with two asterisks: these are just personal impressions as it is currently impossible to establish a prevalence for these types. See the note at the end of this page as to why not.



More than 50% of synesthetes

15% – 50% of synesthetes

1% – 15% of synesthetes

Less than 1% of synesthetes

Very common

Common

Not so common

Uncommon

Grapheme-colour (letters, written words, numbers)

(Grapheme-colour can actually be considered a type of Coloured sequence synesthesia, making this group of synesthesias in general the most common of all)

 

 

Auditory-visual / chromesthesia

 

Coloured sequences (time units such as days and months, and other sequences)

 

Ordinal linguistic personification (letters and/or numbers)**

 

 Spatial sequence**

 

 

 

Auditory-gustatory (sound or music-taste)

Auditory-olfactory (sound or music-smell)

Auditory-tactile

Aura (projective personality-colour synesthesia)

Colour-taste*

Concept-shape

Duality synesthesia (masculine/feminine, heavy/light, rounded/pointy etc.)*

Gustatory-visual (taste-colour and taste-shape)

Lexeme-colour and morpheme-colour

Lexical-gustatory

Lexical-olfactory*

Mirror touch**

Motion-to-sound synesthesia (observed movement-sound)

Motor (or kinetic/kinesthetic) synesthesia

Music-temperature*

Olfactory-visual (smell-colour and smell-shape)

Pain-colour/shape/image

Personality-colour

Person-colour (known people have colour associations)

Personification of days or months*

Phoneme-colour

Sexual (and romantic) synesthesia*

Stimulus-parity (odd/even)*

Ticker tape**


Auditory-motor (involuntary movements in response to sounds)*

Colour personification

Colour-smell*

Colour-sound

Colour-tactile

Concept-sound

Emotion-smell

Emotion-sound

Emotion-tactile

Emotion-taste

Grapheme-smell (numbers and letters)

Grapheme-sound (numbers and letters)

Grapheme-taste (numbers and letters)

Grapheme-tactile (numbers and letters)

Grapheme-temperature (numbers and letters)*

Gustatory-auditory (taste-sound)

Gustatory-tactile*

Kinetics-colour (own body movements)

Kinetics-sound (own body movements)

Lexical-tactile

Machine empathy*

Mathematical concepts-vision synesthesias

Mirror speech

Olfactory-auditory (smell-sound)

Olfactory-tactile

Pain-smell

Pain-sound

Pain-taste

Perceived emotion-colour-smell-taste-touch (emotions observed in others)

Personality-smell

Personality-taste

Personification of musical sequences

Tactile-auditory

Tactile-emotion (texture-emotion)

Tactile-gustatory

Tactile-olfactory

Tactile-visual

More than 50%

15% – 50%

1% – 15%

Less than 1%

Very common

Common

Not so common

Uncommon





Note: the table does not contain a list of all the existing types of synesthesia, it is just a route for finding information on this website.

** It isn't possible to suggest a final percentage for these types, for several reasons. It has been observed that spatial sequence, ticker tape, mirror touch (and some empathy-related phenomena) and, to a lesser extent, OLP could be present in people who would not normally not be considered synesthetes. They may even occur in higher percentages of the general population than the 4% accepted today as being the total percentage of synesthetes: some studies have estimated that around 15% of the general population might experience some degree of spatial sequencing and over 30% ticker tape, for example, if the weaker forms are included. Research is still needed to determine whether these types occur more strongly in people we would normally consider synesthetes than in other individuals; what percentage of synesthetes have each of these types; and whether we should extend our definition of what a synesthete is or, on the contrary, consider that these types are not actually synesthesia but in fact other phenomena. Until there are sufficient studies to resolve these issues I can only give figures based on my personal impression, which of course is totally subjective. 
You might also find these Synesthesia Tree information pages interesting:
Why is is impossible to say how many types of synesthesia there are?
The most common types of synesthesia (a short summary)
What is the rarest type of synesthesia? (there isn't one, and the article explains why not!)

This page last updated: 30 March 2026

The British spelling is "List of synaesthesia types by prevalence" 

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Site map
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This is a list of all the pages in The Synesthesia Tree


Home page              Alphabetical list of types of synesthesia Synesthesias by sense combinations      Synesthesias by prevalence
The Synesthesia Finder

There follows a list of the 105 pages on types/subtypes of synesthesia and some other related phenomena.

After this the other types of pages on the site are listed (brief definitions; information pages).

The pages do not have a set order. I’ve divided them into groups here, each group with a key word as a heading.


Auditory (visual)

Auditory-visual synesthesia

General sounds-vision (colour/shape)

Musical synesthesias

Chromesthesia

Timbre-colour and timbre-shape

Tone-colour (musical note-colour)

Chord-colour

Key signature-colour

Musical mode-colour

Song-colour. Musical genre-colour

Voice-colour and voice-shape

Seeing flashes on hearing loud or sudden sounds (not a type of synesthesia)

Flow state images (images seen in creative/musical trance)


Auditory (non-visual)

Auditory-gustatory synesthesia

Tone-taste (musical notes) and chord-taste

Song-taste. Musical genre-taste

Voice-to-taste

Auditory-olfactory synesthesia

Auditory-tactile synesthesia

Sound-texture synesthesia

Musical note-texture synesthesia

Auditory-motor synesthesia

Music and temperature

Misophonia (not a type of synesthesia)

In this section, see also Personification of sequences of musical sounds


Graphemes (visual)

Grapheme-colour synesthesia

Grapheme-shape/texture/colour/image synesthesia

Lexeme-colour and morpheme-colour synesthesia

Phoneme-colour synesthesia

 

Graphemes (non-visual)

Grapheme-taste and grapheme-smell synesthesia

Grapheme-sound synesthesia

Grapheme-tactile synesthesia

Number-sound synesthesia

Grapheme-temperature synesthesia

In this section, see also grapheme personification (numbers and letters)

Words

Lexical-gustatory synesthesia

Lexical-olfactory synesthesia

Lexical-motor synesthesia

Lexical-tactile synethesia

Ticker tape


Sequences of concepts (visual)

Coloured sequence synesthesia

Time units-colour

Concept-shape

Mathematical synesthesias


Sequences of concepts (non-visual)

Concept-taste and concept-smell

Concept-sound

Smelling images. Tasting images

Parity/duality/number

Stimulus-parity synesthesia

Dichotomy synesthesia (stimulus-dichotomy or duality synesthesia)

Gender as a synesthetic concurrent

Numbers as a synesthetic concurrent


Personification

Ordinal linguistic personification and personification in general

Letter personification

Number personification

Personification of days or months

Colour personification

Object personification

Cutlery personification

Personification of sequences of musical sounds


People

Person-colour synesthesia

Personality-colour synesthesia

“Aura” synesthesia (projective personality-colour)

Perceived emotion-to-colour (and other concurrents)

Personality-smell and personality-taste synesthesia


Spatial sequences

Spatial sequence synesthesia

Calendar synesthesia

Number form synesthesia

Alphabet-form synesthesia

Spatial sequences of concepts (other than time units, numbers or letters)


Colour (inducer)

Colour-to-taste synesthesia

Colour-to-smell synesthesia

Colour-sound (colour-tone) synesthesia

Colour-tactile synesthesia

In this section, see also Colour personification


Movement

Motor synesthesia

Kinetics-colour synesthesia

Motion-to-sound synesthesia


Pain

Pain-colour and pain-shape synesthesia

Pain-smell synesthesia

Pain-taste synesthesia

Pain-sound synesthesia

Emotion

Emotion-colour and emotion-shape synesthesia

Emotion-taste synesthesia

Emotion-smell synesthesia

Emotion-tactile synesthesia

Emotion-sound synesthesia

Is emotion a synesthetic concurrent?

In this section, see also Perceived emotion-to-colour (and other concurrents)


Gustatory

Gustatory-visual synesthesia

Taste-colour synesthesia

Taste-shape synesthesia

Gustatory-auditory synesthesia

Gustatory-tactile synesthesia

Taste and smell (not a type of synesthesia)

 

Olfactory

Olfactory-visual synesthesia

Olfactory-auditory synesthesia

Olfactory-tactile synesthesia

Smell and memory, taste and Proust’s madeleine

In this section, see also Taste and smell (not a type of synesthesia)


Mirror

Mirror touch

Machine empathy

Mirror speech

Mirror kinetics

Pain empathy (not a type of synesthesia)


Tactile

Tactile-visual synesthesia

Sexual (and romantic) synesthesia

Tactile-gustatory and tactile-olfactory synesthesia

Tactile-auditory synesthesia

Tactile-emotion synesthesia

 

Other

“Sensation” synesthesia or mixed concurrents

Ideasthesia (ideaesthesia) (not a type of synesthesia)

Sight as a synesthetic inducer

Figurative images as a synesthetic concurrent


Brief definitionsSynesthesia - Inducer and concurrent - Projector and associator / Projective and associative synesthesia - Photism - Ideasthesia


Information pages:

All about synesthesia

The neurological basis for synesthesia

Do I have synesthesia? (Ask us!)

The most common types of synesthesia

The rarest forms of synesthesia

Why it is impossible to say how many types of synesthesia there are?

Useful Recommended Synesthesia Resources

Synesthesia Congresses & Conferences 

Books about synesthesia

Artists with synesthesia

Some current facebook groups you can join

Some Synesthesia Associations

About the author (who created this site and why)

Privacy Policy

Cookie Policy

Legal Notice

No AI Content Policy




This page last updated: 5 April 2026


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All About Synesthesia
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Synesthesia is a neurological trait possessed by approximately 4% of the general population.


For these people, perceiving a certain stimulus (sensory or conceptual) involuntarily and consistently triggers a second perceptual experience, typically via a different sense.


There are many different types, and people who have synesthesia (called synesthetes) usually have several at once.


The most frequent type is coloured sequence synesthesia, where elements forming part of learnt sequences of concepts such as letters, numbers, days or months evoke a colour perception. Grapheme-colour synesthesia, in which each letter and/or number is associated with its corresponding colour, is the most common type of coloured sequence synesthesia. Approximately 60% of synesthetes have this kind.


Auditory-visual synesthesia is another relatively common type, as about a third of all synesthetes have it. These are the people who can “see music”: sounds, timbres, musical notes or songs trigger visual perceptions. There are various subtypes of auditory-visual synesthesia: while some people see or feel a different colour on hearing each individual musical note, others get their synesthetic perceptions from timbre, visualising different geometric shapes for example for the sound of each musical instrument, while for other synesthetes general day-to-day sounds evoke colour, shape, position and movement. In fact, no two cases are alike.


Another relatively common type of synesthesia is spatial sequence, with subtypes including calendar synesthesia, where the concept of time units – hours, days, months, years, decades and so on – are perceived visually on a kind of mental map around them, which can shift its perspective depending on the current day or month, etc.


Other types of synesthesia clearly involve two different senses, such as olfactory-visual synesthesia, where smells evoke visual perceptions (colours and/or shapes), or auditory-tactile, where hearing certain sounds (those of different musical instruments, for example) consistently triggers tactile sensations on different parts of the body.


Some synesthetes see their colours or other synesthetic concurrents physically as if they were on a “screen” in front of them, while others (the vast majority) only perceive them in the mind’s eye or “know” they are there. The first type of synesthetes are called projectors or are said to have projective synesthesia, and the latter type are associators or have associative synesthesia. In both cases the visual concurrent that is seen or perceived is called a photism.


Synesthesia always involves an inducer and a concurrent. The inducer is the specific stimulus that triggers the synesthetic experience – hearing a certain musical note, for example. The concurrent is the additional perception that is triggered, which might be feeling the sensation of the colour dark blue when that specific note is heard. Other features of synesthesia are that the experiences are consciously perceived; involuntary or automatic; idiosyncratic (the same inducers are associated with different concurrents in each synesthete); consistent; memorable; and usually pleasant, with the vast majority of synesthetes enjoying the way they perceive their world. It is also true that their form of perception seems totally normal to them and they are often deeply shocked when they realise that most people do not see the world like they do. Of course, many of them have no idea that they have such a thing as synesthesia. But it’s never too late to realise and the “eureka moment” can come at any age.

 

Are synesthetes born or made? They’re born. Synesthesia is a hereditary trait and synesthetes are often aware of other family members who have it too. In 2018 some of the genetic variants responsible for the phenomenon were identified, although it seems clear that many different genes are involved, most of them still unknown. It is also a fact that not all people born with these genes actually express them, so there are even cases of identical twins where one is a synesthete and the other is not. There are also people whose synesthetic disposition is very strongly expressed – multiple types, manifesting strongly – and others with a profile where the disposition is less strongly expressed, who might have only one or two types and only mild experiences with them. Synesthesia is rather more common among people on the autism spectrum (it has been estimated that as compared to a frequency of around 4% in the general population, 15%-20% of those people on the spectrum could have it). Up until about 15 years ago synesthesia was thought to be much more common in women than in men, but today’s rigorous study methods have disproven this theory, discovering that it is actually equally prevalent in both sexes. Another theory that has bitten the dust is that there is a higher incidence of left-handedness in the synesthete population: it is now known that this is not the case, although there do seem to be more ambidextrous or cross-dominant people than in the general population (although still a minority).


With regard to the neurological basis for synesthesia, the main theories that have been put forward are 1. the cross-activation (“neural pruning”) theory (Ramachandran and Hubbard, 2001), 2. the disinhibited feedback theory (Neufeld et al., 2012) and, recently, 3. the stochastic resonance model (Lalwani and Brang, 2019). None of these models have yet been conclusively proven as the definitive basis, and research is ongoing. There is a brief description of each theory on this page, with links to the original studies and further reading.


On the Tree website we only talk about developmental or natural synesthesia, which is present from birth and is the result of genetic expression, although induced or acquired synesthesia also exists, producing experiences that are similar to (but not exactly the same as) those of congenital synesthesia and which can be caused by brain injury, drug use – mainly hallucinogens – or other less common causes.  

 

While the first studies on synesthetic phenomena date back to the early nineteenth century, it was only in the 1990s that more mainstream research began to be dedicated to synesthesia and the general population became more aware of it. Some relevant researchers are Richard Cytowic, Vilyanur Ramachandran, Sean Day, Julia Simner, Jamie Ward, Simon Baron-Cohen, Lawrence Marks, David Eagleman and Anton Dorso, among others. Conferences and congresses are held worldwide, bringing together researchers, synesthetes and other people with an interest in the subject, and there are an increasing number of online resources for anyone who wants to read recent research, find out basic information and make contact or compare experiences with other synesthetes.


Articles for further reading

This recent scientific article (November 2021) by Jamie Ward gives a brilliant comprehensive overview of synesthesia in the state of the art, addressing all its main aspects.  

Here's a recent general article on synesthesia I can also recommend, by Sydney Perkowitz for Nautilus magazine.

If you're looking for a readable, easy-to-understand article about synesthesia that is fun while being scientifically correct, you'll like this one by Clare Jonas on her website That Thinking Feeling.

Here's another good article that touches on many different aspects of synesthesia: Exploring Synesthesia: A Journey into Neuroscience of Perception by Shelly Jones on the site Webmedy (2023).

In this video, "Synaesthesia Masterclass", Dr. Mary Spiller, a cognitive psychologist and lecturer at the University of East London, gives a good overview of what synesthesia is and what kind of tests can be done to determine it.

... and in a recent podcast in her Let's Talk Synaesthesia series, Maike Preissing interviewed leading scientist and synesthesia researcher Julia Simner, who described what it's all about. You can listen via this link and if you click on the Transcription tag you can also see an (automatically generated) written transcription too. 


This page last updated: 21 April 2026

This page is "All About Synaesthesia", in the British English spelling



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The most common types of synesthesia
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These are the most common types of synesthesia:


Grapheme-colour / Coloured sequences

The most common type of all is coloured sequence synesthesia, which includes grapheme-colour (letters/words/numbers-colour) and time units-colour (days/months-colour). Most synesthetes have at least one of these types.


Chromesthesia / Auditory-visual

The next commonest type of synesthesia is auditory-visual, more specifically chromesthesia (where music or sound induce perceptions consisting of, or including, colour). It is estimated that somewhere under half of all of all synesthetes could have one or more of its subtypes.


Ordinal linguistic personification (OLP)

Another relatively frequent type is ordinal linguistic personification, where a gender, personality and other human characteristics are attributed to sequences such as letters and numbers.


Spatial sequence

And a fourth type that is also quite common is spatial sequence synesthesia, which consists of visualising certain sequences in physical space, the most frequent being the calendar (days, months, years, etc.) and numbers.

 

Go to the list of types of synesthesia by prevalence





In the British English spelling, this page is about "The most common types of synaesthesia."
This page last updated: 5 March 2026
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What is the rarest type of synesthesia?
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There’s no answer to that question! It’s impossible to say which type it is, for several reasons. But it is certainly NOT lexical-gustatory, as some websites erroneously state (see footnote 1 about the reasons for this).

In brief...

In general, the types of synesthesia with a non-visual concurrent (olfactory, gustatory, tactile, etc.) are much less common than those with a concurrent of colour.

No specific type/subtype/manifestation of synesthesia can be called “the rarest type” because there are so many that only a few people have (and it’s impossible to calculate exactly how many people have them), and there are also types that logically exist but have never been reported by anyone.

Also, there is no universal system for determining what actually constitutes “a type of synesthesia”.


What might some candidates be for a supposedly "rarest type"?

Here are some types or sub-types that are very uncommon (with links to the page containing information on them and reports by people who have them):

Grapheme-smell/taste (each letter and/or number has a smell or taste. This type shouldn’t be confused with lexical-gustatory synesthesia, which is word-taste and is much more common as probably around 3% or more of synesthetes have it. Lexical-olfactory, where words have smells, is rarer than lexical-gustatory.)

Tactile-olfactory and tactile-gustatory (on touching different surfaces, the synesthete consistently perceives a particular smell or taste)

Perceived emotion-touch sensations (the perception of different emotions in other people creates a specific, consistent tactile sensation in a particular part of the body)

Conceptual-auditory synesthesia is a very uncommon type, and an excellent example of a very rare or perhaps unique manifestation is hairstyles-sound.


However, we cannot really say that the above types of synesthesia are the least common, as cases have been described and confirmed. The ones that really would be the rarest are those for which no case has ever been reported. Some examples of types that probably exist but which as far as I know no-one has reported yet are:

Kinetics-smell and kinetics-taste (different movements of one’s own body create the consistent perception of a smell or taste) (... but take a look at the comment of June 13, 2024 below to see a very interesting description of just this!)

Time units (such as days or months)-tactile sensations or pain-texture could be some other unreported types.


A problem with calculating the rarest types: the sample size

It is difficult to estimate the frequency of the most uncommon types of synesthesia because not enough people have them to provide a sufficiently sized sample population for testing. Quite reliable prevalence figures exist for the more common types of synesthesia, because rigorous scientific methods have been used to assess many hundreds of people after verifying the genuineness of their synesthetic experiences using techniques such as the Battery Test. But for the more uncommon types the reliable samples are very small, and in the case of the very rare types they are practically zero and there are simply no figures available: all we can do is guess.


But what does a “type of synesthesia” consist of anyway?

One of the problems in attempting to define what the rarest synesthesia types might be is in classifying what actually constitutes a “type of synesthesia”: how should we subdivide? Breaking them down into main groups – auditory-visual, olfactory-tactile, and so on – is not the same as finely subdividing them by particular manifestations into types like “decades-to-colour”, “weekday personification”, “morpheme-colour” or “novels I’ve read-spatial location”.


If we subdivide by overarching groups, the most common synesthesias would be those that have a colour perception as their concurrent, and the least common would probably be those with a tactile or olfactory/gustatory concurrent (see footnote 2).


A large-scale research study by Novich, Cheng and Eagleman, Is synaesthesia one condition or many? A large-scale analysis reveals subgroups (2011) proposed 5 clusters of synesthesia types:

- coloured sequences (month-colour, grapheme-colour, etc.)
- coloured sensations (pain-colour, for example)
- music-colour
- synesthesias with non-visual concurrents (evoking smell, sound, touch, taste, etc.)
- spatial sequences

The least common cluster would be non-visual concurrents. Talking about clusters rather than specific types, subtypes or manifestations of synesthesia is a much more practical way of trying to determine what might be the “least common synesthesia type”.


On this page of the Tree: List of types of synesthesia by prevalence, the furthest column to the right shows a list of the types and manifestations of synesthesia that could be the rarest, with an incidence of less than 1% among the synesthete population. As you can see, they are very numerous: much more numerous than the more common types. I’d also like to clarify that this is only a rough approximation to the real situation, as apart from there being no reliable figures available for these types some of them might also be more widespread than was formerly believed (and they might jump to a higher column when more cases are reported).


Weak synesthesias

It should be borne in mind that many synesthetes have only very mild manifestations of a particular type of synesthesia or have simply not focused on it enough to realise that they have it, and this also influences the number of reports and figures available to researchers. In the past, as a result of this effect and the fact that synesthesia was hardly talked about (and up to about 1990 or 2000 scientific knowledge on the subject was much more limited), it was generally believed to be an extremely rare phenomenon, although it is now known that this is not the case, with a commonly accepted figure of almost 4% of synesthetes in the population. When a type of synesthesia begins to be discussed, it is commented in the dedicated groups and forums in the social networks and more people appear who can talk about their own experiences with it. But the rarer types of synesthesia are less talked about, precisely because they are rarer… and logically it is more difficult for them to come to light than in the case of more common types.


Synesthetic concurrents: mixed or on the rocks?

Another effect that complicates the possibility of counting cases of certain types of synesthesia is that some concurrents tend to occur jointly with others, making them more difficult to classify. Grapheme-temperature synesthesia is an example of this: for many synesthetes, temperature is probably an integral part of their grapheme-colour synesthesia, but it wouldn’t occur to them to say that they have grapheme-temperature synesthesia. If we only count the people who experience a temperature concurrent without an associated colour perception we would have one figure, while if we counted all grapheme-colour synesthetes with this additional temperature perception we would have another, much higher, one. Which would be correct? Another example would be grapheme-smell or grapheme-taste synesthesia, where the smells and tastes could be merely an accompaniment to the main perception of colour.


Who has the rarest forms of synesthesia?

Whatever the case, it is interesting to note that the most uncommon types of synesthesia tend to be experienced by people whose very high “synesthetic disposition” gives them a profile with many different types, often strongly expressed. This phenomenon tends to occur more frequently in people on the autism spectrum, although not exclusively so. If someone has only one subtype or manifestation of synesthesia, or very few, it is very unlikely that this type would be precisely one of the rarest. If that seems to be the case, the phenomenon they are experiencing is probably not a type of synesthesia.


Footnote 1:It is reported by Sean Day that 2.89% of 1,143 synesthetes interviewed had lexeme-to-flavour correlations. A figure of “less than 0.2% of synesthetes” can sometimes also be found, as in the important study conducted by Julia Simner et al. in 2005 on a sample of 500 members of the general population no-one reported it at all. However, accounts of lexical-gustatory synesthesia can be found without excessive difficulty, and it is certainly not “the rarest type of synesthesia that exists” as some websites currently claim. Until now there has been no standardised method for determining it, although work has recently been done on a system for diagnosing this type of synesthesia so the figures may eventually prove to be higher.
Footnote 2:Emotion (as a single concurrent rather than a by-product of the synesthetic experience in general) could be considered an extremely rare concurrent as there is only one type accepted as synesthesia at the present time that has emotion as a concurrent: tactile-emotion synesthesia. However, it is a special case which perhaps should not even be considered a type of synesthesia at all, and it is easy to confuse an “emotional synesthesia” with many other phenomena that evoke emotions but are not considered types of synesthesia (frisson, misophonia, empathy, music causing emotion, etc.).



In the British English spelling, this page is about: There isn’t a rarest type of synaesthesia, What is the rarest type of synaesthesia? or What is the rarest form of synaesthesia?

This page last updated: 21 April 2026

This Tree page was first published on 13 July 2022


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Do I have synesthesia?
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If you experience something you think is synesthesia but you’re not sure or you can't find what type it is, tell us about it in the comments on this page. I’ll reply as soon as I can.


Here are the Do I Have Synesthesia FAQs:


Where do I write my question (comment)?
Scroll down right to the end of this page and click on Load more (there are a lot of comments so you might need to do that twice or more). Under the last comment, i.e. the most recent, is the box where you can write your question.

Is there a maximum number of words I can write?
The site is powered by Blogger, who limits the number of words in one single comment, although the limit is long so your question should fit! If it doesn't, you can either reduce its length (better), or continue in a second comment.

Should I look anywhere first to try and find out what type of synesthesia I have before asking here?
Yes, the best ways are:
- browse the alphabetical list
- use the Synesthesia Finder tool
They lead you to different Tree pages where it's likely you'll find the type you have.
People usually ask here in Do I Have because they read pages on the site first but their experience doesn't seem to fit in with any of the types described, it seems different or unreported, it seems to be a mix of types they can't work out how to name or classify, or they can't manage to find it after looking at relevant pages and using the Finder tool, and they need some more help.

Will I get an answer?
Yes, even though it might take some time, usually days or sometimes weeks, to get your answer. That's because answering the questions is a careful process that sometimes takes me quite a long time and unfortunately I don't have that time available every day.Please feel free to remind me in a further comment if I seem to have forgotten to answer you: occasionally I skip a comment without realising or the notification didn't reach me and I didn't see it.

Does Pau answer all the questions here?
In principle yes. I try to answer all the questions, at least on the Do I Have page (not always on other Tree pages). However, as is logical, I don't answer questions that are spammy, disrespectful, don't seem to be written in good faith or if they're not clear and can't be understood.Occasionally other readers reply to the comments here too as they have something interesting to say, but I'll still answer you just the same.

Is it better to send Pau an email with my question about what type of synesthesia I have?
No, you should ask in Do I Have, as I don't usually answer emails with this type of question, for reasons of time and because it's better for them to be on this page so others can also read and benefit from them. You can ask on this page anonymously, of course.

Will the reply I get always be the best, the most accurate, the only answer to my question?
I answer to the best of my knowledge. I will give a reliable reply based on the current scientific knowledge I'm aware of and my years of experience in this field and as the Tree author, but it might not be the only answer and other researchers/people knowledgeable in this field might give you a different reply if you asked them. Synesthesia is a complex subject with many, many different types and manifestations so often there may not be one single answer or even any answer at all: we just have to go by opinion and intuition in that case. Sometimes I will have no idea of the answer (I'll tell you, if that's the case). I'm more knowledgeable about some types than others. In any case, my answer will always be just my opinion, and it might not be the only one.

Will I be notified by email of my answer?
Yes I think so, as I believe all replies to comments are notified to the commenter's email address if they give one, but to be sure, you can tick the Notify Me box or go and look later on just in case.
This page last updated: 14 March 2026






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Why is it impossible to say how many types of synesthesia there are?
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1. Types, subtypes, variants, manifestations, expressions… how should they be broken down? Is a “type of synesthesia” something very general like “auditory-visual”, or should more specific manifestations like “timbre-colour” also be included? “Time unit-colour” is considered a type (although it is really just a subtype of “coloured sequences”), but what about month-colour? Is that a type? And decade-colour?

There are numerous ways to subdivide them, and they could all be considered valid.

Each individual researcher or person who decided to make a list would use their own classification and the end result could be a vastly differing number of types.

Perhaps in future we will agree on an “official” method (or methods) of counting them.


2. A large number of very rare types of synesthesia have been documented, but what about a type that nobody actually has? Is that a type of synesthesia? Because there are many types that exist in theory but have never been reported, which means we are moving into purely theoretical territory. Morpheme-to-touch, anyone? Personality-to-sound? Pain personification?


3. And how should we classify the phenomena that are often considered a type but do not actually meet all the basic criteria for being synesthesia? Mirror touch, ticker tape and even ordinal linguistic personification raise some doubt in this regard, not to mention phenomena like misophonia, which is clearly not a type of synesthesia but for the moment still stubbornly sits on some lists like that of the English-language Wikipedia entry, giving rise to confusion. Mirror touch is a good example of a type which despite being generally accepted as such is a source of discrepancy for some researchers, who would not include it on their own list of types.


For these reasons I don’t believe it is possible to give a specific number and it probably never will be.






This page last updated: 5 March 2026
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About the author - who created this site and why
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Hi!

I’m Pau 365. I live in Seville, Spain. In December 2016 I found out I had synesthesia and since then I’ve spent a lot of my time researching and studying this fascinating subject.


In 2018, after studying it in depth, meeting synesthetes and researchers at the International Congress of Synesthesia, Science & Art held here in Andalusia that year and creating and running a workshop on the subject along with a psychologist friend, I decided that my next project would be to discover a way of ordering and classifying the different types of synesthesia, an aspect I was particularly interested in.


There are a lot of types of synesthesia. In fact, no one actually knows how many there are. It all depends on how you categorise them and what you consider synesthesia and what you don’t. (Go to the page Why it is impossible to say how many types of synesthesia there are?) Anyway, I thought I’d have a go at constructing a kind of “family tree” of as many different types of synesthesia as I was aware of at that point.


But what started out as a “tree” in the classic sense of taking a big piece of paper and drawing a diagram on it with its trunk and its branches, its roots and leaves, its flowers, fruit, twigs, buds, boughs, its nodes and offshoots, divisions and deviations… OK, you can get a pretty good idea of how complicated that turned out to be. And it would certainly never fit on a piece of paper, or even on the wall of a building, probably. But I liked the idea and I didn’t give up, and one day it suddenly dawned on me that I could do it as a website. A site for people to consult if they’re interested in a particular type of synesthesia or would like to know if they have it or not, a site with multiple links to get you to what you’re looking for by a variety of routes, no limit on the number of pages, no time constraints in setting it up… and that was when the Tree was first planted and started to grow. Now it’s complete, and with over a hundred pages on different aspects and types of synesthesia and other phenomena that can sometimes be confused with it. I’ve really learnt a lot and it turned out to be the ideal project to dedicate my time to in 2020-21, during these strange social-life-less, stay-at-home months.


I created the Spanish version of the site first (El Árbol de la Sinestesia), and it saw the light in early February 2021. I always intended for there to be an English version too as that would open it up to many more people. Luckily I happen to be a professional translator and like what I do, so adapting it to the English version was a challenge that I really enjoyed.


I think my main aim in making the Synesthesia Tree is to fill a gap, as up to now there hasn’t been a list available for consultation like this one, with a large number of types and subtypes of synesthesia each linked to a reasonably detailed specific description and with examples of real cases. I think a lot of people are looking for a list like this and I hope they find it and it’s useful to them.


Who is the Synesthesia Tree for?


Many people are synesthetes and don’t know it, and they’re looking for explanations of these things that have always been part of their lives but that others don’t quite seem to understand.


Some people experience different phenomena and want to know whether these are synesthesia or something else.


Some people who already know they are synesthetes would like to know if they have more types.


Researchers sometimes need starting points to approach types that are little studied or scarcely known.


And there are of course people who just have an interest in this fascinating subject.


The Synesthesia Tree is intended for consultation by all these people and more. I’ve attempted to pitch the site at all of them, which is obviously not an easy task, but I hope that as far as possible the information I’m presenting here turns out to be useful, reader-friendly, understandable and also scientifically accurate (very important, that last aspect).


I’ve enjoyed just about every minute I’ve spent creating the Synesthesia Tree: researching, chatting online with other synesthetes, reading, writing, translating, taking the photographs and creating the compositions to illustrate the posts and, more than anything else, learning: learning something every single day. Making sense of things I already knew, things I was vaguely aware of but unsure, and things I had no idea even existed. And if I can share that enjoyment and that knowledge with other people now… well that’s my mission accomplished.


My idea is for this to be a site in constant expansion and I hope to keep on improving it by adding new aspects of interest, correcting my mistakes and including the ideas and help I’ll perhaps receive from readers via email or the comments section on each page. So please comment or email me: any observations or questions are more than welcome! There’s also a Do I Have Synesthesia page, if anyone wants to explain their particular case and ask.


Thank you for reading this, and remember I’d be delighted to read about your experiences with synesthesia in the comments.


Pau

(also known as Pau 365, Pau Tres Seis Cinco, Pau Sandham or Paula Sandham Burns)

Text written in 2021

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The neurological basis: synesthesia and the brain
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The following models have been proposed as a neurological basis for synesthesia. Research is ongoing, as none of them have yet been conclusively proven as the definitive explanation.


1. The cross-activation (or neural pruning) theory (Ramachandran and Hubbard, 2001) suggests that all individuals are born with an excess of working connections between brain areas (they are "born synesthetes", as it were), but in the non-synesthete majority the neural connections required for synesthetic processing are pruned away during the first few months of life.

Psychophysical investigations into the neural basis of synaesthesia, V. S. Ramachandran and E. M. Hubbard, 2001

(After 10 years, they wrote the following: The cross-activation theory at 10. Hubbard, E.M., Brang, D. & Ramachandran, V.S., 2011)


2. The disinhibited feedback theory (Neufeld et al., 2012) puts forward the idea that there is nothing that distinguishes a synesthete brain from a normal brain but instead synesthethic sensations arise via disinhibited feedback: excess activity between the levels of the sensory hierarchy or concurrent pathways because of a disinhibition of normally-occurring feedback signals.

Disinhibited feedback as a cause of synesthesia: evidence from a functional connectivity study on auditory-visual synesthetes. Neufeld, J. et al., 2012.


3. The stochastic resonance model (Lalwani and Brang, 2019) suggests that rather than being due to either of the two previous models, a simple change in levels of neural noise in the sensory systems can lead to the experience of synaesthesia (both acquired and developmental forms).

Stochastic resonance model of synaesthesia, Poortata Lalwani and David Brang, 2019


For more general descriptions and further reading on this subject:

Chapter 9 of the book Wednesday is Indigo Blue by Richard E. Cytowic and David M. Eagleman, "Inside a Synesthete's Brain" (2009)

Synesthesia: opening the doors of perception. Dartmouth Undergraduate Journal of Science (2010)

Why synesthesia occurs: Neurowiki (2013)

The section Hypotheses from the classic literature (paragraphs 12-23) of the excellent research article More than a condition: an examination of synaesthesia as a key cognitive factor in the processing of reality and in its literary and pictorial renditions, in the scientific review Interfaces, 36 | 2015, pp.29-55. Séverine Letalleur-Sommer, University of Paris-Ouest la Défense (2015).

The Stochastic Resonance Model study (theory no. 3 above) includes a description of all three models mentioned here (2019)

Synaesthesia and autism: Different developmental outcomes from overlapping mechanisms? Tessa M. van Leeuwen, Janina Neufeld, James Hughes & Jamie Ward, in Cognitive Neuropsychology Volume 37 Issue 7-8 (2020)

Synesthesia is linked to large and extensive differences in brain structure and function as determined by whole-brain biomarkers derived from the HCP (Human Connectome Project) cortical parcellation approach Jamie Ward, Julia Simner, Ivor Simpson, Charlotte Rae, Magda del Rio, Jessica A Eccles, Chris Racey, in Cerebral Cortex, Volume 34, Issue 11 (November 2024)


This page last updated: 21 April 2026


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Books about synesthesia
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Here’s a list of some recommendable books on synesthesia.


IN ENGLISH (in chronological order of publication):


The Man who Tasted Shapes (Richard E. Cytowic). The MIT Press. 1993

 

Bright Colors Falsely Seen. Synaesthesia and the Search for Transcendental Knowledge (Kevin T. Dann). Yale University Press. 1998 


Blue Cats and Chartreuse Kittens. How Synesthetes Colour their Worlds (Patricia Lynne Duffy). Times Books. 2001

 

A Mango-shaped Space (Wendy Mass). Little, Brown and Company. 2003. (Fiction for young readers: ideal for teens but any age will enjoy it)


The Hidden Sense. Synesthesia in Art and Science (Cretien Von Campen). The MIT Press. 2007


Born on a Blue Day (Daniel Tammet). Hodder Paperback. 2007

 

The Frog Who Croaked Blue. Synesthesia and the mixing of the senses (Jamie Ward). Routledge. 2008

 

Wednesday is Indigo Blue. Discovering the Brain of Synesthesia (Richard E. Cytowic and David M. Eagleman) The MIT Press. 2009

 

(For young readers) The Noisy Paintbox: The Colours and Sounds of Kandinsky's Abstract Art (Barb Rosenstock, illustrated by Mary Grandpré). Knopf Books for Young Readers. 2014.


Mirror Touch. A Memoir of Synesthesia and the Secret Life of the Brain (Joel Salinas). Harper One. 2017


Synesthesia (Richard E. Cytowic). The MIT Press Essential Knowledge Series. 2018


Synaesthesia: A Very Short Introduction (Julia Simner). Oxford University Press. 2019


Audio Book: Blue Cats and Chartreuse Kittens. How Synesthetes Colour their Worlds (Patricia Lynne Duffy, narrated by Appelusa). With research updates and synesthetic music. Available from Audible (in the US, UK, Canada, Germany, France, Australia and Japan). 2021


Synesthetes: A Handbook (Sean Day). Second edition. 2021. Available in PDF format, here.


(For very young children) Sereya's Superpower (Christy Gurley). 2022. Available from Starshine Designs.


Painting Music (Ninghui Xiong). Artecittà Fundación Internacional. 2023. Available in ebook format here or here.


Synesthesia and Synesthetes (Sean Day). 2022. Available on Amazon, although the 2nd edition is now out:

Synesthesia and Synesthetes (Sean Day), 2nd edition. 2025. Paperback or Kindle edition available here.


Swifts. Art project for synaesthetic perception of migratory species (Ninghui Xiong). The full book about the project run for the 2025 Spain Synesthesia Congress involving synesthete artists worldwide. 2026. Available in ebook format here.


FINDING MORE FICTION (in English)

Pat Duffy has a list of plenty of fictional works with synesthete characters on her Blue Cats and Chartreuse Kittens website:

Fiction Synesthete Characters

And here's a website that lists and provides a resume of some fictional books with synesthete characters that might appeal to teenage readers:

Booklist: Synesthesia in Middle Grade and YA

And an article by Pat Duffy on the Journey Through the Senses website with 8 book reviews: "Novels with Neurospicy Characters" (2003 - 2024). These recent works naturally include several characters with synesthesia.

 

IN SPANISH:

 

Sinestesia. El color de las palabras, el sabor de la música, el lugar del tiempo… (Alicia Callejas and Juan Lupiáñez). Alianza Editorial, 2012

 

IN FRENCH:

 

Des phénomènes de synopsie (Théodore Flournoy). Elibron Classics. Facsimile edition. 1893.


In the British English spelling, this page would be called "Books about synaesthesia".

This page last updated: 5 March 2026


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Artists with synesthesia
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Here are some synesthetes who represent (or represented, as some are not contemporary) their synesthesia via the visual arts. The links are to their websites or somewhere you can see their syn-related works and/or read about their synesthesia and their embodiment of it through art. 

Most of these artists are contemporary, some are not. Some are world-famous, others well-known in the synesthesia circuits, others are not well-known but are just amazing new discoveries! Painting is the most represented visual art here, but you can also find animation, photography, sculpture, textile art, theatre set design and video creation.


Ali Al-Ezzi
Ali Barker
April Zanne Johnson
Bertram Brooker (1888 - 1955)

Brandy Gale

Brian Carlson

BSP

Carol Steen

Carrie C. Firman

CC Hart

Charles Burchfield (1893-1969)

Christina Eve

Dasha Pears

David Hockney

Gaby Cardoso

Geri Hahn

Jack Coulter

Jane MacKay

Jessica Kendall Hankiewicz

Kayt Hughes

Kia Lydia

Lucas Masoch/Baumarius

Marcia Smilack

María José de Córdoba

Marina WitteMann

Matthew McClosky

Melissa S. McCracken

Meriem Delacroix

Michael Haverkamp

Michel Gagné

Miren Karmele Gómez (sinesK)

Ninghui Xiong

Penelope Moore

Pepa Salas Vilar

Pierre van Dijk

Raewyn Turner

Rosy Long

Sarah Kraning

Sue Holmes

Timothy B. Layden

Vincent Van Gogh (1853-1890)

Wassily Kandinsky  (1866-1944)

Zoesthesia


Check out the latest contemporary syn artists here too:



The British English spelling for this page about synesthete artists is "synaesthete artists" or "artists with synaesthesia".

This page last updated: 17 April 2026


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Some current Facebook groups you can join:
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Synesthesia 

 

UK Synaesthesia Association 

 

IASAS (The International Association of Synaesthetes, Artists, and Scientists)


Synesthesia World


I have Synesthesia: I'm not a freak, I'm a synesthete


INCA - International Neurodiverse Connections Association (this group, formerly International Synesthesia Connections Association, started out as a synesthesia-related group but is now about all types of neurodiversity)

 

Synesthete Artists


Time-Space Synesthesia


Mirror Pain Synesthesia

.

The Synesthesia Society of Africa (SSOA)


Art & Synesthesie - Connecting of the Senses (synesthete painter Pierre van Dijk)


Synaesthesia Research


In other languages:


Sinestesia Argentina (Spanish) 


Synesthésie / Synesthesia (French)


Synesthésie et Heuresthésie  (French)






This page last updated: 6 March 2026

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Contact:
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Please feel free to email me at


pau365@hotmail.com


if you would like to get in touch.


Thank you!





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Emotion-sound synesthesia
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Emotions triggering sound as a synesthetic concurrent is a rare type of synesthesia. It can occur with two categories of emotions: with one’s own emotions, or when other people’s are observed or intuitively perceived. The same emotion gives rise to the same sound perception, and the sounds are usually reported as being fairly simple in nature. It’s difficult to find reports of this uncommon type of synesthesia: in Sean Day’s study on 1,297 synesthetes only one of them identified as having this type of experience.


Here are some descriptions written by people with this type of synesthesia:


Hearing sound with one’s own emotions:

“Basically, when I feel emotions (specially on a high intensity), I hear a sound. Almost like a frequency. Each emotion has its own frequency and that frequency stays unchanging. It's always been like that for me. I've never quite come to hear the frequency for sadness, but I have one for almost all emotions, which I could quickly identify, and which I vividly hear.”

(Source: This post on the Synesthesia subreddit. 2025.)


“Whenever I feel a certain emotion, there's always a certain image that pops into my mind. (…) I can also "hear" my emotions, like neutral or indifferent would sound like a fan or TV static.”

(Source: This comment on the Do I Have Synesthesia? page of the Synesthesia Tree website. 2022.)

 

Synesthete researcher Lidell Simpson was interviewed by Maureen Seaberg for the website "Psychology Today" about his synesthesia (read the interview here), and one of the types he reported was emotion-sound:

Maureen: Which forms of synesthesia do you have?

Lidell: Motion to sound, touch and taste, smell to sound, emotion to sound - hell, just about everything has sound. Anything that changes state gives sonic information. I once called it Photonic Hearing. (…)

I guess it is the way I think in a non-verbal and non-visual manners. Totally sound.”

As a deaf person, and after researching in the neurobiology and brain imaging areas and having conversations with some leading scientists working in this area, Lidell has considered that his brain may have rewired itself so as to perceive sounds from other sensory stimuli in substitution of other external auditory input.

 

Perceived emotion-sound. Two cases of synesthetes who hear sound for other people’s emotions.

“The sound of a person who has got angry is really loud. For example, when two people have a quarrel. The voice is noisy of course, but the sound is also loud too. Two angry sounds crush each other in big volume, and after they stop talking, start ignoring each other, the sound still remains. That sound scares me a lot.

I understand people by hearing sound. Another example, the sound of loneliness. That sound is like breaking glass. It's clear, straight, a sort of beautiful, but it comes to stab in my chest, and hurt me so deeply.”

(Source: conversations with the synesthete Miho Ito. 2022.)



"Essentially, sometimes (not all the time) I feel people's feelings/their tone of voice as a musical note in my body. Like a reverberating piano note in my chest. Once, I was in a conversation with two people I didn't know, and as one person was speaking, I felt them get subtly offended. This felt like someone hit a sharp note on a piano in my chest. Then the other person responded and I felt that they were upset, and that felt like a flat piano note in my chest. If someone is anxious, it feels like a quick staccato series of notes.
It doesn't happen with every person, but the standouts are with strangers. That's when I notice it the most.
Sometimes it's not a note, but a flooding feeling where it can take me a while to figure out if the feeling is mine or the other person's."

(Source: a comment from synesthete Bea on the Do I Have Synesthesia page of the Synesthesia Tree. 2025/26.)

 

Related types of synesthesia:

Emotion-taste

Emotion-smell

Emotion-tactile

Emotion-colour/shape

Perceived emotion-to-colour (and other concurrents)

Pain-sound

 

This page first published: 6 September 2025.

This page last updated: 24 January 2026.

The British English spelling for this page is "Emotion-sound synaesthesia".

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Lexical-tactile synesthesia
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Lexical-tactile synesthesia involves consistent tactile sensations being perceived in the body, head, hands, etc. when reading, looking at, hearing or thinking about certain words. Rather being just a one-off occurrence, these sensations would be felt on a regular basis, corresponding to the same words each time and not just to reading or speech in general. It is an uncommon type of synesthesia, with few cases reported. 

If the touch sensations occur are evoked by individual letters rather than whole words, it would be a case of another rare type of synesthesia called grapheme-tactile synesthesia.

Go to the page on grapheme-tactile synesthesia

However, there are cases described where lexical-tactile and grapheme-tactile synesthesia occur together in the same person, as some of their consistent touch sensations are induced by the letters in a word while others only happen in response to the word as a whole.

Here is a description written by a person with lexical-tactile synesthesia (in addition to grapheme-tactile, so they get tactile perceptions from both whole words and letters):

"Basically different letters and words give different sensations on different parts of my head and back.

It happens for non-English words too, my second language is Chinese, so i feel associated touches and sensations for those too. (…)

I could categorise the main 'touches' that I get from reading as a either a head, back, or spine related touch.

On the head, there's generally 5 sensations that I can sort of categorise them into - tug, weighted, brush past, tilt and buzz.

•  tug (small pull, or perhaps none at all, in the sense that it's something loosening)

•  weighted (prolonged pull)

•  brush past (momentary contact)

•  tilt (makes me feel like my head is tilted sideways but it isn't, usually momentary because if it was prolonged i would just count it as dizziness and i've never had consistent experiences of prolonged 'tilt')

•  buzz (generally on the top of head)

On the back it's mainly just brushing past on the shoulder blades for certain words and on the spine it's more tingly. I do have two strange words that trigger a pull around the tailbone area - that being naphthalene (that thing in mothballs) and consecutive.

Some scenarios that people might be curious about:

If a word is misspelled I would still feel the same grapheme-tactile/lexical-tactile feeling as it would give if I had read the correctly spelled word. e.g. if 'misspelled' was spelled as 'mispelled' it still gives the sensation of a loose hair pulled out of my hair.

If I imagine the things people are saying as subtitles in my head (I have a decent imagination) and keep up with what they're saying in terms of understanding and also coming up with subtitles at the same time I do feel the grapheme-tactile/lexical-tactile sensations to some extent.

These grapheme-tactile/lexical-tactile experiences also happen if I replay an argument / conversation that happened before in playwriting format in my head - I enjoy reading plays, not so much watching them - so it would go like Person A: blah blah blah and so on, and if I think of heard conversations in playwriting format in my head it would still produce similar grapheme-tactile/lexical-tactile sensations."

(Source: this post and comments on the Synesthesia subReddit. 2020)


Here is someone else who reports lexical-tactile synesthesia. In this case they have both lexical-tactile and auditory-tactile synesthesia, as in addition to touch sensations being produced by words and grammar, they have also described having them in response to sounds, music, timbre and musical genres.

"I can physically feel the textures of sounds. However, the feeling of words is usually arbitrary. For example, the word “sandpaper” feels like sandpaper, and I feel it in the palm of my hand, but “sharp” feels kind of like a guitar sting wrapped around my arm. Also, spoken bad grammar feels like pins and needles."

(Source: this post on the Synesthesia subReddit. 2020)


This next person gives an interesting description of how they perceive sensations mainly in their mouth from different words. They consider it lexical-tactile synesthesia rather than lexical-gustatory, as the sensations produced are felt as mouthfeel (i.e. tactile) rather than actual flavour sensations, which would be the case for lexical-gustatory:

"I don’t feel words/sounds/letters on my head or shoulders but in my mouth and throat, but it’s not “taste”, it’s a distinct tactile feeling.

For example, reading or hearing certain words might feel like swishing a bunch of cold marbles in my mouth, or biting down on a piece of tin foil, or like chewing on cotton, or the sensation of thick mud coating my tongue, or percolating bubbles. Tastes are much more rare but occasional. (…)

For me, the most distinct sensations come when I’m reading something like poetry or prose, where the focus is on the words themselves and less the information being conveyed by them. I can kind of ignore it if I’m trying to read a manual or something. Similarly, I have sensations when someone is speaking words, but again, it’s usually in the case of someone reciting something or in a video where there is no expectation for me to verbally respond - my brain focuses on the meaning and context of the words if I’m actually in a conversation. Visually seeing the words written out, as full words versus singular letters, produces the strongest tactile sensation - single letters hardly ever really stand out.

For example, from me going back to reread the paragraph I just typed, I can point out a few words that have specific sensations (as not all do). “Distinct” feels like tapping my front teeth on a granite countertop. “Sensation” is silky like drinking very thick chocolate milk and drawing it through your mouth with some suction. “Prose” is snappy, like the feeling of a long pretzel stick breaking when you go to bite it. “Focus” feels like blowing a stream of air out of pursed lips.

Hearing spoken words generates similar responses."

(Source: this post and these comments on the Synesthesia subReddit. 2023 and 2025)


Go to the page on grapheme-tactile synesthesia


This page first published: 29 June 2025

This page last updated: 26 February 2026


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Grapheme-tactile synesthesia
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It could also be called grapheme-touch synesthesia

This is an uncommon type of synesthesia, with very few cases reported. It consists of tactile sensations being perceived in the body, head, hands, etc. when looking at or thinking about specific letters of the alphabet or numbers. These tactile sensations would occur regularly, rather than being just a one-off occurrence or happening very infrequently, and the same tactile perception would always correspond to the same symbol.



If these touch sensations occur in response to whole words rather than individual letters, it would be a case of lexical-tactile synesthesia.

Go to the page on lexical-tactile synesthesia

Lexical-tactile and grapheme-tactile synesthesia can occur together in the same person, if some of their consistent tactile sensations are induced by the letters in a word while others only happen in response to the word as a whole.


Here is an interesting description by a person who has both grapheme-tactile and lexical-tactile synesthesia:

“When i read the word lily or other taller and thinner words or letters like typing 'l' consecutively 'lllll' its a vibration bzzzing at the top of my head,

Basically different letters and words give different sensations on different parts of my head and back.

It happens for non-English words too, my second language is Chinese, so i feel associated touches and sensations for those too. (…)

Anyways, I guess I could categorise the main 'touches' that I get from reading as a either a head, back, or spine related touch.

On the head, there's generally 5 sensations that I can sort of categorise them into - tug, weighted, brush past, tilt and buzz. (…) On the back it's mainly just brushing past on the shoulder blades for certain words and on the spine it's more tingly.”

(Source: This post and comments on Reddit/Synesthesia. 2025)


Go to the page on lexical-tactile synesthesia


This page first published: 29 June 2025

This page last updated: 26 February 2026

The British English spelling for this page is "Grapheme-tactile synaesthesia".

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Musical modes-colour
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Different musical scales – in this case the seven modes, which are seven types of scales that each have distinct melodic characteristics – are an example of a music-related sequence that can induce synesthesia, giving rise to perceptions of different colours for each mode. These seven scales or modes are called Ionian, Dorian, Phrygian, Lydian, Mixolydian, Aeolian and Locrian. This appears to be a very infrequent subtype of synesthesia and it is logical that it would only be found in people with a knowledge of music theory. It can be considered a type of chromesthesia, and it could also be regarded as an example of coloured sequence synesthesia.


It is reasonable to assume that colour is the most common concurrent, but in theory other perceptions are possible and the musical modes might give rise to shapes, tastes, smells, spatial locations or perhaps tactile sensations. However, these would be extremely rare synesthesia subtypes and I am not aware of anyone ever having reported them.


Here are some descriptions written by people with these types of synesthesia:

(Both these synesthetes have an in-depth knowledge of musical theory, and you will note that the colours they perceive with the various modes are similar in some cases and very different in others.)

“Not when you’re just playing a scale up and down, but when different scales and modes are used in any genre of music. For example, Dorian mode is very blue to me like a hard blue jolly rancher, and when music mixes in a IV in minor or some other dorian-esque chord, I see blue in my minds eye. it is immediate and involuntary. If a song that’s in major throws in a bVII chord or a minor v chord, I immediately hear green (mixolydian). Using a #4 evokes purple (lydian) and when a b2 is used it evokes yellows oranges and reds depending on the rest of the music.”

“In a modal mixture  - if a song is mostly in the major mode but then the artist throws in a chord that’s from, say, the mixolydian mode - then now that part of the song is green to me.”

(Source: This post and comment on Reddit/Synesthesia. 2022.)


“I have synesthesia and I see

Ionian: bright yellow. Dorian: paleish blue. Phrygian: dark purple with a bit of red but not quite maroon. Lydian: deep blue. Mixolydian: bright red. Aeolian: teal green/blue. Locrian: deep blood red.

My synesthesia is a bit different though where I mostly see colors in terms of tone and EQ, not as much with pitch. These are the colors I see while playing in the modes but I don't see them as much while listening to a song. The key a song is in will change them up too. These are mostly what I see off the C major scale.”

(Source: This comment on Reddit/MusicTheory. 2022. The post is an interesting read in general, as the poster asks what colours people would assign to the different musical modes and a good variety of answers were received, a few from synesthetes and the majority from non-synesthetes).



Go to the page on all the musical synesthesias

Go to the page on auditory-visual synesthesia in general

Go to the page on tone-colour synesthesia (musical notes-colour)

Go to the page on key signature-colour synesthesia

Go to the page on chord-colour synesthesia

Go to the page on song/musical genre-colour synesthesia

Go to the page on coloured sequence synesthesia


Post first published: 10 October 2022

This page last updated: 26 February 2026


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Coloured sensations, visualised sensations
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These terms have been used been used to refer to the following types of synesthesia: 


Auditory-visual synesthesia and chromesthesia

Algesic-visual synesthesia (pain-colour/pain-shape)

Tactile-visual and touch-colour synesthesia 

Gustatory-visual and taste-colour synesthesia 

Olfactory-visual and smell-colour synesthesia


Novich, Cheng and Eagleman used the term “colored sensations” in their research study Is synaesthesia one condition or many? A large-scale analysis reveals subgroups (2011), considering it to be one of the five main synesthetic clusters, and Jamie Ward also talks about it in his study “Synesthesia” (2021), where he says:

“Visualized sensations to sounds, pain, touch, taste, and smell not only tend to consist of concurrent experiences of color, but also have elements of shape, movement, and texture. That is, it is more of an abstract-animated spectacle that unfolds with the inducer itself (i.e., as it shifts in intensity or quality). There is some evidence that these putatively different kinds of synesthesia tend to group together as a subtype (Novich et al., 2011).”


This page first published: 14 July 2022

This page last updated: 11 April 2024


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“Sensation” synesthesia or mixed concurrents
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Some synesthetes find it difficult to specify what their concurrent is, as it seems to be made up of multiple perceptions and sensations at the same time. The concurrent sometimes even just consists of a powerful “feeling” or “vibe”, which is automatic and consistent but practically impossible to describe.


Here are some descriptions written by people who have this kind of experience:

"My syn is a bit particular. Like, first, I have grapheme colour and personification, and also sound to colour and movement of shapes. But if I just kind of let go the sort of mental walls that I create, I start to feel that all my senses come together, it is like all my perceptions mix in one unique process, and every stimulus makes me perceive complex sights, and feel a wave of physical sensations that take the form of coloured shapes in movement inside me and on my skin (not exactly that, but kind of). It feels a bit like the fingers on a guitar string let go, and the string can finally vibrate completely."

(Source: This comment on Reddit/Synesthesia. 2022.)


“Half the colors I associate with numbers aren’t really colors. Their whole complicated mess just happens to share a vibe with a color.”

(Source: This comment on Reddit/Synesthesia. 2022.)


"For as long as I can remember, I can "smell" months, seasons, and weather patterns, as well as associate colors with them and get feelings from them. I do not have to currently be in a month/season/weather pattern to experience this sensation; even just thinking about them can cause it. As an example; April smells like green which is dirt to me, and feels open and unending to me.
I'm not sure how else to explain it; it makes so much sense to me but does not make sense to others."

(Source: This post on Reddit/Synesthesia. 2021.)


"Is there a term for when Audio, Visual, and Tactile are all combined?
I’m not exactly sure how to define mine, everything just kind of meshes together in various forms by associating in my mind, I guess the best way to put it is that everything gives off “vibes”, or certain patterns and tones when in my head, including more complex things like equations, and everything is kind of “manipulated” by mental hands, and a lot of things can be represented on different parts of my body, like how certain trains of thought are in the lower right part of my mouth."

(Source: This post on Reddit/Synesthesia. 2021.)


“I think a good example for me would be any song by Kimya Dawson? She has a kind of desaturated, pinkish plum coloured voice and I feel it on my nose and the bottom ridges of my eyes. Sometimes, when her songs get more ‘white’ I feel it on my sternum as well.”

(Source: This comment on Reddit/Synesthesia. 2019.)


“There is something sensory I detect with voices done by voice actors that I recognize. It isn't strictly a color or taste or shape but a "vapor" of all three. It's hard to explain. Voices always have a shape to them to me, but it's not a discernable shape. Like I couldn't tell you. It's some weird sense I see/taste/feel in a combined way. The color and taste are more vapor/indistinct but definitely still there. I am very good at identifying voice actors for this reason.”

(Source: This comment on Reddit/Synesthesia. 2022.)

 

What could this be called?

This highly personal and idiosyncratic manner of perceiving the synesthetic concurrents has never been classified as a type in itself or been given a name, although there is no doubt that it belongs to the realm of synesthesia. Here are a few ideas and suggestions for naming it:

- Multiple concurrent or mixed concurrent synesthesia. Multi-perception, multi-sensation or multi-sensory synesthesia.

- Alternatively, the name of the most prevalent synesthetic experience could be used, bearing in mind that it is fairly normal for one predominant concurrent to also be enriched by others that form an indivisible part of it, as that is how synesthesia commonly manifests.

- Or we could say that the synesthete in question has several types: to give a very basic example, if smells make them perceive coloured shapes that are visual and tactile at the same time, this person could be said to have olfactory-visual and also olfactory-tactile synesthesia.


More cases / readers' comments: read all the comments on this article here


This page last updated: 12 September 2024


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Numbers as a synesthetic concurrent
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In the past, sequences of cultural symbols such as numbers, letters or time units used to be considered a valid inducer of synesthesia but not a synesthetic concurrent (except in the case of types like spatial sequences or ticker tape). This meant that expressions such as number-colour or number-sound would be seen as types of synesthesia, while colour-number or sound-number would not. However, in relatively recent times researchers have acknowledged the possibility of numbers being a synesthetic concurrent, normally as a manifestation of bidirectional synesthesia.

What form do these types of synesthesia take?


1. Bidirectional synesthesia with numbers as a concurrent

In the vast majority of cases synesthesia is a one-way process, meaning that a synesthete who perceives colours on listening to music would not normally also hear musical sounds when looking at coloured surfaces. But some synesthetes do in fact have two-way perceptions, so for instance each number makes them perceive a particular colour but they also have an automatic, consistent mental representation of that number or amount (magnitude) when they see or think about each colour (“6 is red… and red is 6”).


Sean Day explains this phenomenon in his book Synesthetes (2016):

“Whereas ‘colored letters and numbers’ synesthesia has been long known, with hundreds of studies done on different letter and number sets, there emerged an idea that this type of synesthesia must, by default, be one-way(1) – that is, seeing a letter or number might synesthetically evoke a color, but seeing a color wouldn’t evoke a letter or number. We now know that such is not the case: two-way synesthesia, while extremely rare, does exist(2), and there are rare cases of synesthesia in which, indeed, seeing a specific color will synesthetically evoke a number or letter.”

(1) See, for example, Mills et al. 1999.
(2) See, for example, Brugger et al. 2004; Cohen-Kadosh et al. 2005; Gebuis et al. 2009.


Here are some scientific studies that have addressed the topic of bidirectional synesthesia. All of them mention the case of numbers:

Numbers, Synesthesia, and Directionality by Roi Cohen Kadosh and Avishai Henik, in the Oxford Handbook of Synesthesia, 2013. (The link is to Google Books. The chapter starts on page 103 and the part about bidirectionality on page 111).Priming Letters by Colors: Evidence for the Bidirectionality of Grapheme–Color Synesthesia, Peter Horst Weiss et al, 2008Effects of synaesthetic colour and space on cognition. Clare Jonas, University of Sussex, 2010. (Papers 4 and 5, p.146.)


2. Unidirectional synesthesia with numbers as a concurrent

In this case, an inducer – a colour, a geometric shape, a musical note, a sound or a taste – evokes a number or magnitude, but these numbers or magnitudes do not elicit any perception of their corresponding colour, shape, sound or taste.

“Stimulus-parity” synesthesia, in which many different concepts create the strong, involuntary sensation that they are either odd or even, could perhaps be considered a very basic variety of this type of synesthesia, as each concept has a binary value somehow related to the concept of number or amount.

Go to the page on stimulus-parity synesthesia


Here are some accounts by people who experience numerical perceptions in response to different inducers:


Perceptions of numbers induced by seeing colours

“[I]f I see bright grass green, I get a sense of 3; a stop sign is 4.5; butterscotch yellow prompts 2.56.”

(Source: Philly Markowitz, quoted in the book Synesthetes, 2016, by Sean Day, p.21)


Numbers perceived as corresponding to people's personalities

“She emanated a spherical field of crimson 2s with magenta highlights, assertive and feminine, lined underneath with shy violet 3s.”

(Source: Joel Salinas, talking about meeting Rosie Doherty, in his book Mirror Touch, 2017, p.222.)


Numbers consistently associated with geometric shapes 

“For years now, I have associated numbers with shapes. For example, circle is one to me. Sometimes, if I'm trying to say the shape, I'll accidentally say the number instead, which sounds very weird.”

(Source: This post on Reddit/Synesthesia. 2020.) 


“When I'm playing on a console and I have to press square or triangle, I always think of them as five and six respectively in my head.”

(Source: This comment on Reddit/Synesthesia. 2020.) 


Numbers that correspond to musical sounds (notes and musical genres/sequences)

“The notes in music each have a number. So when I play a g-chord on piano, it isn’t G-B-D-G. It’s 0-4-7-12.”

However, this person offers a possible explanation of their perceptions:

“I think it is in part my way of memorizing chords and notes. I can’t read music, so I’ve always remembered the notes by what number they’d be based on the key of the song (i.e. if the song is in the key of G, G is 1, G sharp is 2 and so forth).”

(Source: This comment on Reddit/Synesthesia. 2016.) 


The same synesthete explains that they perceive numbers for the different parts of a song, but only with particular musical genres... and it seems to aid their enjoyment of the music: 

"It's not for all types of music but only certain genres. Classical, progressive, and a lot of instrumental music is what's most common for me genre wise (although on a rare occasion I can get a song that isn't of those genres.)

Basically I'll listen to a song and then, on what I can only describe as some sort of "white board" in my brain, I will consciously see a sequence of numbers for each part of a that song.

At first I thought it was like trying to figure out a math problem (which freaked me out because my entire life I have never been good at math) but after having it occur more frequently I realized it was just a string of numbers and each number was associated with a section of the song.

Sometimes the sections are small, sometimes they're large and more like an entire part of a song, and sometimes they're single notes of a song.

The only numbers I can associate with music are the numbers 1-9 and haven't come across any other numbers than those.

When this happens it's not in any way a sensory overload, it's more just sort of there and not a bother in any way. In fact I've found that when this happens for those certain songs they turn out to be my favorite (it's very relaxing to focus on both the music and its associated numbers.)”

(Source: This post on Reddit/Synesthesia. 2016.) 


Go to the page on stimulus-parity synesthesia (concepts are odd or even)

Go to the page on number-form synesthesia (numbers have a spatial location)


Post first published: 28 February 2022

This page last updated: 26 February 2026


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Flow state images
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Consistent images seen in creative trance when playing a musical instrument



I have recently come across several cases of an interesting phenomenon which I think is a firm candidate for being considered a type of synesthesia. It consists of the visualisation of pictorial images, random but usually very consistent, by people in a state of heightened concentration when playing a musical instrument – particularly if they are creating, memorising or learning a piece of music – or when concentrating on a creative task of another kind with musical accompaniment. It would seem to be a fairly rare phenomenon, as yet unknown, although it may perhaps achieve more recognition with more cases being brought to light in the future.
The images perceived are figurative (places, people and objects) and they are usually random in nature, although in some cases they may correspond to autobiographical childhood memories. In many cases – or in all cases perhaps – they are consistent, i.e. the same images are associated with the same musical sequences. It appears to happen when the person enters the "flow state", i.e. the special state of profound concentration and/or relaxation induced by a creative process, and it particularly occurs on learning to play the instrument itself or on studying and memorising new pieces of music.
Could this be considered a type of synesthesia with musical sequences as an inducer? Time will tell. In general, synesthetic visualisations are abstract rather than figurative; however, some pictorial manifestations are usually accepted as being synesthesia (see the next paragraph below and the page on figurative images as a synesthetic concurrent), which would open up the possibility of its future acceptance. As it is not a known phenomenon at the present time there are no studies on it or, as far as I am aware, any mentions in the literature. I've personally gathered notes on about twenty cases. Most of the people who have reported it say they also have other types of synesthesia so there may be a correlation, but sampling in the general population would of course be required to determine to what extent it affects both synesthetes and non-synesthetes.
It actually bears a fairly close resemblance to sexual/romantic synesthesia (due to the type of images visualised, the similarity it appears to have with hypnagogic imagery and the special state of trance/concentration/relaxation required to experience it), although it seems to be more consistent than the latter, as the same pictures repeat on different occasions in response to the same stimulus and this is not usually the case with sexual synesthesia. It is interesting to note that there is a dual inducer of the experience: the musical sequences and also the mental flow state given rise to by playing an instrument, creating and/or memorising.
Here are some descriptions written by people who experience this phenomenon:

The first case I came across

“I'm curious to know if others and indeed if all pianists see random images or think of certain things/people when they play a piece. I get it with every piece I play, but it's nothing that's connected to the style of the piece..it's much more abstract than that. (...) The last few pieces I've learned (and it's always at the same part of the piece) I have had flashes into my head of random images such as - a crocodile, my sister, a girl at my work who I have never spoken to, my friend's ex boyfriend (again..don't even know him that well), a boat on the water, a woman waiting for her husband to come back from war..and the word banana. (...) The only way I can describe it is as if you were recalling your dream from the night before and images flash into your head.”

(Source: this forum on the classical piano website Piano Street. 2017.)


Images on learning musical sections

“I have musical chromesthesia and usually see colors for music, but Bach's music tends to be colorless for me. Instead of colors, I'll get images associated with some of the sections (I never see a color and an image at the same time), and I need to be actually playing the piece in order to see them. Also, once I gain muscle memory for the piece, I won't see the images anymore (but the exact images come back if I forget and relearn the piece).”

Jacqueline, the girl who experiences this phenomenon, has shared her perceptions with us in this fascinating video (2021), “How my synesthesia interprets WTC Prelude No. 6”.  (There is also a direct link to see the video at the end of this page)


Chords and flowers
"I’m self taught in piano and I learned just by listening to music, not by learning to read sheet music. The sheet music just couldn’t click with me. However, some specific notes or chords that I would strike on my piano would give me an image of a flower depending on what pitch it was. Deeper sounds are dark purple irises, other higher pitched sounds would be orange marigolds or yellow roses. If I played fast enough I could almost describe it as growing a garden at my finger tips. I really loved it, but unfortunately I fell out of practice and can’t really play anymore. But when I hit even one key on a piano, I can still see the flowers. (…)  This only happens to me when I play piano, never when I’m just listening to music alone.

I still remember chords from pieces of music I’d learned because I remember the flowers, there’s a chord that is 100% a yellow rose for me every time, it never changes.

(…) It’s making me want to relearn piano again, which I think I definitely will do. It might be interesting to see if everything comes back to me exactly as it did once before."

(Source: this post and comments on Reddit/Synesthesia. 2024.)


On learning to play an instrument“My brother bought an electric keyboard thing (…) and he gave it to me and I had NO idea how to play it, so I would just watch those mini videos on YouTube and just copy them and then keep playing it until I remembered it. (…) Something that I didn't notice at first but was kind of weirded out by when I realised, was what I thought or saw when I played [certain songs]. (…) I would associate certain sections (I think melody might be a better word) within the song with a pretty specific image that I would see in my head.

So for an example of the song I most experienced this with, Dancers on a String, I would remember the song in sections, like 2-5 notes, with an image and when I was playing the song I would mentally be like 'okay now is the pear part' without even realising how strange that was. Some of the specific imagery I would see consisted of:

- a red barn with many black widow spiders and clocks
- tiny little cubes of pear, like the texture of a pear and were light green
- someone big with their face like squashed against the screen as if I was looking through a camera
(…)

As you can see, these were bizarre.

In Swan Lake I associated one short section of like one or two notes with an old dust lamp you would find in like a grandmas home and it was yellow, and I associated another later section with like death hounds trying to chase someone.

I have no idea why I see these things so vividly, and I don't think it's unique to a certain note, as I play the same note in different songs and I don't see the same imagery. My dad suggested that maybe its how I remember certain patterns. I don't think I have this with actual music, or anything else. Its just specific to when I'm playing the keyboard and trying to remember how to play.”

(Source: This post on Reddit/Synesthesia. 2021.)


Autobiographical images

“I definitely experience this every time I play. I see random images from my childhood. And I mean random. One is looking under the sideboard at a neighbour’s house which must have been from when I was 6 or 7. Several relate to particular places in my old secondary school. Another is at the top of the stairs at my auntie’s house. It’s always the same set of places but there are probably about 100 different places. (…) It’s interesting that there are no images from after the age of about 13 or 14 which is when I stopped having piano lessons.”

(Source: This comment on Reddit/Piano. 2021.)


Personification of chord sequences/parts of songs

“I play in a band and (…) my fellow guitarist asked me how (…) I can seemingly remember chord sequences or parts of songs if I don’t play them for a couple of weeks. (…) I told him that I can remember parts because they are all people to me, and if I can remember the person I can remember the part. (…)

The whole thing is involuntary and I can't influence how the personification presents itself. Sometimes they are pretty vague personifications which I would struggle to describe visually but will feel a certain way like a strong masculine presence for instance. Others however can be very vivid and specific and I could describe exactly as they appear physically and also what kind of person they are.

Personifications seem to be strongest for me with anything in the key of E.

I'm not sure at what point the personification manifests itself, it's not something I've been able to consciously pinpoint. It could be that is appears the very first time I play a chord sequence and I only really become aware of it as I repeat it or it could be that it takes a couple of plays through to manifest. It's possibly a chicken or the egg situation.

As far as I'm aware the personification doesn't grow stronger or fade in any way, they manifest and remain the same regardless of how much I play the chords.

(…) The most useful part is the strong association the personification and the music have together, which means that I can remember chord sequences and guitar parts easier than I may do otherwise. It can also be difficult giving up on parts that don't fit or work in a song because I've this strange bond with them as they are like friends to me in a way. I can let them go though as I know they don't really exist."

(Source: This post and comments on Reddit/Synesthesia. 2023.)

This account is also related to Personification of musical sequences.


Creative writing + music
“I was on the midst of plotting a short story that I was wanting to write while listening to music when suddenly an image flashed for a second then disappeared. The image was a valley of white lilies. It felt as if I saw the song as a picture then vanished as quickly as it came. It distracted me from further imagining the rest of my story so I surrendered and went to listen to other songs and to my surprise, it happened again. Another song I felt / saw was a landscape of a candy land which is again, very befitting the song. The next song I played showed me a dim dark room with an endless staircase and a lone lightbulb swinging from the ceiling.”

(Source: This post on Reddit/Synesthesia. 2021.)



The video "How my synesthesia interprets WTC Prelude No. 6”, by Jacqueline Cordes.


Go to the page on figurative images as a synesthetic concurrent

Go to the page on sexual (and romantic) synesthesia

Go to the page on musical synesthesias

Go to the page on auditory-visual synesthesia

Go to the page on personification of musical sequences

 

This post first published: 24 August 2021

This page last updated: 10 February 2026


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It could also be called conceptual-auditory synesthesia


This type of synesthesia is interesting but uncommon. It consists of a concurrent sound perception – frequencies, timbres or even chords or melodies – triggered by the different concepts or items that form part of a series, category or sequence. Some already known examples are grapheme-sound (evoked by letters and/or numbers) and colour-sound, and pain-sound synesthesia might also fall into this category. However, in addition to these there are other, less habitual, concepts that can each produce their own specific sound perception. The auditory concurrents evoked are involuntary and consistent, and although some synesthetes may hear the sounds physically as if they were real, it appears that most only hear them in the mind.


Here are some descriptions written by people with this type of synesthesia:


Shape-to-sound

“I ‘hear’ the outlines of shapes. For example: think of those little racecar tracks that little kids put together. If I trace that track with my eyes, I can ‘hear’ (in my head, of course) the sounds of the curves, twists, bends and loops. Even straight lines have a specific ‘sound’. Each sound is always the same for that particular ‘outline’. So a loop does not sound like a straight line. And sometimes the sounds slow down and speed up, depending on what the ‘shape’ is.”

(Source: This post on Reddit/Synesthesia. 2022.)


Time units-to-sound (years)

“Every time a certain year appears, I hear a piece of music that goes with that year. Not all years, just some of the them seem to activate the music, and there’s no logic to it, I only know that certain years correspond to certain pieces of music and that each year has its own piece. I don’t understand how my brain invents these things, but I’ve been like that all my life. And if you were born in one of the years on this list, it means you’re defined by the music associated with that year.”

(A few examples taken from a longer list:)1963 https://youtu.be/yPxxH2EOQu8
1975 https://youtu.be/TxDqZTlJqmo
1992 https://youtu.be/07GF9DxlrKc

(Source: a post in the Facebook group “Synesthesia”, 2021. Original text in French.)

People-to-sound
“Usually when I think of someone, I think of a blend of some colors, but then a series of sounds with... bodies? For example, a friend of mine is deep purple, bordering on blue, red, and a somehow gorgeous swampy green, but also "eh", "e-ah", and "mmhuh". (....) Then I also associate expressions or postures to match the sounds, essentially the personified sound, what it would feel like if it had a form and mood."

(Source: This post on Reddit/Synesthesia. 2021.)

Proper names-to-sound

This person appears to immediately and consistently associate a sound with each proper name (as well as an image). These are just a few examples:
“Sarah sounds like a cup falling off the counter.
Dominick sounds like a big fan turning on.
Augustine sounds like a cat’s nails on tile.
Rowan sounds like a spray bottle being squirted (one of my favorite sounds!)
Cecilia sounds like a ball bouncing in a small room off of all the walls.”

(Source: this post on Reddit/Synesthesia. 2022.)

Hairstyles-to-sound
"Hairstyles have noises. (…) Usually, the noise is either that of an instrument or a vocalization, but sometimes, it's something else entirely, and not all hairstyles have noises.
I think it's a lot less noticeable, but I vaguely remember getting sounds from other series of things.
(I hear them) in the mind. Usually, the more prominent and eccentric the hairstyle is, the louder and longer the sound is. Different parts of certain hairstyles seem to produce different sounds. A friend of mine has a large spiky mohawk on the top of his head, but shorter hair over the rest of his head. The mohawk produces the sound of a quick, energetic bass guitar riff, whereas the shorter hair produces the sound of a hard-to-specify wind instrument in the distance. I also know that even similar hairstyles can produce wildly different sounds."

(Source: a conversation arising from a post in the Facebook group “Synesthesia”, 2021.)

Numerous concepts to chords
"I have aphantasia, and can't visualize a thing. (…) But every emotion of mine has a chord. Every taste has a chords. Every physical touch has a chord. Hot and cold have chords. I can tell you the exact notes of my heart on a keyboard. Exactly what I'm feeling... Examples:"My emotions at the moment are e e skip an octave e. C g c 2nd octave. A e a 2nd octave. D f a 2nd octave. E g b. I can just take note of what I'm feeling and play them. The feeling will most the time go away and turn into something else when I play them.""My black berry drink I'm drinking bottom a up 2 cs up 2 es. Top c g c. Middle e f b. Middle c e a up to a e a. (...) It also has sharps of top a sharp a sharp a sharp. Flats of bottom gfl dfl skipping up one to a sharp."
(Source: this post and comments on Reddit/Synesthesia. 2025.)


Go to the page on colour-sound synesthesia

Go to the page on grapheme-sound synesthesia

Go to the page on number-sound synesthesia

Go to the page on pain-sound synesthesia

Go to the page on motion-to-sound synesthesia

Go to the page on coloured sequence synesthesia (concept-colour)


This page last updated: 20 January 2025

This page first published: 15 August 2021


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