Synaesthesia and savant syndrome: are we all superhuman?

“There are numerous different kinds of synaesthesia,” Professor Brogaard began. “One of the most common forms is grapheme-colour synaesthesia, which is where letters or numbers give rise to specific colours. There are people who have so-called mirror-touch synaesthesia who experience the feeling of being touched when they see other people being touched. There are others who see colours when they taste something and some people even see colours when they feel fear.”