Synesthesia is a perceptual condition of mixed sensations. Synesthesia can involve any of the sense, the most common one being colored letters and numbers.
Diagnoses:
There are no officially established diagnoses, but there are a few diagnoses criteria. Neurologist Richard Cytowic identifies the following criteria:
1. Synesthesia is involuntary and automatic.
2. Synesthetic perceptions are spatially extended, meaning they have a sense of "location".
3. Synesthetic percepts are consistent and generic.
4. Synesthesia is highly memorable.
5. Synesthesia is laden with affect.
Who Has It?
Synesthetes tend to be:
Women: In the us, studies show that 3 times as many women than men are more likely to be synethete, in England, 8 times.
References:
http://www.synesthete.org/
http://faculty.washington.edu/chudler/syne.html
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