21.12.2012 @ PsychologyToday
(picture from LightsAllAround)
Synesthesia is characterized as a condition in which a sensory or cognitive input gives rise to atypical output. For example, you see a black number, and this gives rise to a sensation of green. Or you see a black letter and you taste lemon. One of the best-known forms of color synesthesia is grapheme-color synesthesia, in which numbers or letters are seen as colored. But lots of other forms of color synesthesia have been identified, including week-color synesthesia, sound-color synesthesia, taste-color synesthesia, fear-color synesthesia.
Synesthetic color experience is unique for each synesthete. For example, the letter A may trigger the color red in one grapheme-color synesthete but trigger the color blue in another. In fact, each grapheme has been found to trigger each of the 11 Berlin and Kay colors in different synesthetes (red, pink, orange, yellow, green, blue, purple, blown, black, white, gray). Despite the uniqueness of synesthetic color experience, synethetic colors sometimes fall into certain clusters. For example, grapheme-color synesthetes tend to associate A with red, E with yellow or white, I with black or white and O with white.
Read the lengthy article in Psychology Today