Pupil size in people with synesthesia changed depending on how bright or dark the perceived colors were.

Add Yahoo as a preferred source to see more of our stories on Google. A new video editing trend known as “X is Red, Yellow, Green, Blue” (or “Thing is Red, Yellow, Green, Blue”) is introducing people ...

Ever caught a whiff of the color blue? Or tasted a symphony? If that sounds completely bonkers to you, you’re in the majority. But for a small slice of humanity, these cross-sensory experiences are ...

Synesthesia, the neurological condition in which one sense involuntarily triggers another, produces measurable changes in the body’s autonomic nervous system, not just unusual perceptual experiences.

Vladimir Nabokov first noticed, at age 7, his special gift of synesthesia when playing with colorful alphabet blocks that "were all the wrong color." Source: Contributor: Neil Overy/Alamy Stock Photo.

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I have a form of time–space synesthesia, so the new year arrives for me in a very physical way. I feel myself move around the year, almost like I'm traveling along a structure. December sits low and ...