Synesthesia: A rare neurological condition

Human nose "smelling" music

Synesthesia is a rare neurological condition in which stimulation of one sense (e.g., taste) produces experiences in a totally different sense (e.g., sight). The word ‘synesthesia’ comes from the Greek words syn (together) and aisthesis (perception). Therefore, synesthesia literally means “joined perception”. Synesthetes (people with synesthesia) see words, taste colours and shapes and feel flavours.