Synesthesia: What It Is, Signs, Causes, A Test

Synesthesia is a condition where the brain mixes up the senses— and one sensory modality causes a simultaneous stimulation of another. For example, a person with synesthesia may “hear color” or “see sound.”

Synesthesia involves any of the five senses. The most common form is that of colored letters and numbers, in which someone always sees a certain color in response to a letter of the alphabet or a number. For instance, a synesthete might see the number 7 as light blue, 4 as purple, or the word “sky” as dark grey.

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