Richard Cytowic, a pioneering researcher who returned synesthesia to mainstream science, traces the historical evolution of our understanding of the phenomenon. By Richard E. Cytowic / MIT Press ...

Q: Is there really a condition where someone can hear a sound and it makes them see a color? A: Yes, and that condition is called synesthesia. It will be the topic of today’s column. We have five ...

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.

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