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

Synesthesia may explain why some people can control their dreams, revealing a surprising link between perception and lucid ...

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.

Why do some people taste music or hear colors? Let’s talk about synesthesia. Did you know some people 'see' letters in color or 'taste' music? In this video, we’ll talk about synesthesia, how it works ...