Snafus in the brain's functions can cause some very unusual symptoms. What happens to someone if they have the rare brain malfunction known as "synaesthesia"?

Synaesthesia is a highly-unusual neurological trait that results in a merging of senses, so that someone might hear a color or see a sound. Scientists think it happens because the gene that cuts the connections between the senses at a very young age is faulty and the connections are never cut.

Asked by Tom Cohen · Last updated 5 years ago · 18.1K views