It's hard to pinpoint when synesthesia, the rare neurological condition where a stimulus that affects one sense prompts a response in a different sense, was first documented. Scientific literature ...

The synesthesia many people are aware of is where words are experienced as colors. There are arguably much stranger versions ...

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 ...

Add Yahoo as a preferred source to see more of our stories on Google. A new study suggests that people with synesthesia have different pupil reactions depending on the colors they observed. . | Credit ...