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

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.

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 ...

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One lucky guy seems to be experiencing the world’s most colorful sex. His rare form of synesthesia is triggered by orgasm, causing him to briefly see the world in hues of pink. And as a teenager, ...

Daniel Tammet has memorized Pi to the 22,514th digit. He speaks ten different languages, including one of his own invention, and he can multiply enormous sums in his head within a matter of seconds.

Synesthesia is a perceptual experience in which one sensory input (like a letter or number) is automatically associated with another sensory experience (like a color or feeling). The prevalence of ...

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.