What is synesthesia?
Synesthesia is a neurological condition in which the stimulation of one sense triggers stimulation in other unrelated senses. For instance, someone with synesthesia (known as a synesthete) may perceive musical notes as specific colors or associate a smell with a particular physical shape. The term synesthesia itself originates from the Greek roots syn (together) and aesthesis (sensation or perception), collectively meaning “to perceive together.”
Rare types of synesthesia
The following synesthesia subtypes are less common and have received far less documentation. It is important to note that this is by no means an entirely exhaustive list of all subtypes.
Auditory-gustatory (sound or music-taste)
Auditory-olfactory (sound or music-smell)
Aura (projective personality-colour synesthesia)
Gustatory-visual (taste-colour and taste-shape)
Lexeme-colour and morpheme-colour)
Motion-to-sound synesthesia (observed movement-sound)
Motor (or kinetic/kinesthetic) synesthesia
Olfactory-visual (smell-colour and smell-shape)
Person-colour (known people have colour associations)
Rarest subtypes (<1%)
Grapheme-smell (numbers and letters)
Grapheme-sound (numbers and letters)
Grapheme-taste (numbers and letters)
Kinetics-colour (own body movements)
Kinetics-sound (own body movements)
Mathematical concepts-vision synesthesias
Perceived emotion-colour-smell-taste-touch (emotions observed in others)
Personification of musical sequences
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