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 ...

Synesthesia is a neurological condition where a trigger that typically stimulates one of the physical senses stimulates another sense. People who have synesthesia, like Eilish, can be called ...

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.

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

Summer is here. We can go to the beach and swim in the nice cool water. The soft water, the cool breeze, and the occasional jellyfish stings are what most of us will experience. But some people, when ...