Belgian Synesthesia Association

Synesthesia causes people to hear music -? or see letters or numbers -? in color. Neuroscience is beginning to unravel what’s going on in the brains of people with this cerebral phenomenon, but hasn’t yet explained why the genetic mutation exists. V.S. Ramachandran, Director of the Center for Brain and Cognition at UC San Diego, has a theory, as he explains to producer Michael May.