Syn” (Greek, “together” and “Aisthesis” (“sensation”) combine to form this very interesting word and ability, being an automatic response to a stimulus by one sense when that stimulus is usually associated with another sense. For example, there are “synesthetes” who perceive color as an auditory input, basically hearing yellow and so on; more famously are the musicians composing tone poems associating sound with color. There are letter-color and number-color associatons, as well as taste-senses from colors and sounds and so and on.
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