Synesthesia (also spelled synæsthesia or synaesthesia, plural synesthesiae or synaesthesiae)—from the Ancient Greek (syn), meaning "with," and (aisthēsis), meaning "
sensation"'—is a neurologically based phenomenon in which stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway. In one common form of synesthesia, known as
grapheme → color synesthesia,
letters or
numbers are perceived as inherently colored, while in
ordinal linguistic personification, numbers, days of the week and months of the year evoke personalities. In spatial-sequence, or
number form synesthesia, numbers, months of the year, and/or days of the week elicit precise locations in space (for example, 1980 may be "farther away" than 1990), or may have a three-dimensional view of a year as a map (clockwise or counterclockwise).
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