Synesthesia is a condition in which sensory input from one cognitive stream gives rise to experience in another unstimulated cognitive stream. The most common forms of synesthesia include ...

A psychological phenomenon known as "grapheme-color synesthesia" describes individuals who experience vivid colors whenever they see, hear, or think of ordinary letters and digits. New research adds ...

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

To most people a "red-letter day" is merely a metaphor. But it's everyday reality to a synesthete who sees the alphabet in colors. Synesthesia, a condition characterized by one sensory experience ...

If I told you the letter “G” is red, you might be confused. But if you had what’s called grapheme-color synesthesia (GC), there’s a good chance you’d argue I’m wrong. That’s because many people who ...

Add Yahoo as a preferred source to see more of our stories on Google. When Carol Steen first learned the alphabet in elementary school, she was smitten with the very first letter. "'A' was the ...

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.