Bridging senses: novel insights from synaesthesia

Synaesthesia is a neurological phenomenon that can offer an unusually clear window into the factors influencing human sensory perception and the range of normal experience [1,2]. Sometimes described as a blending of the senses, where exposure to a triggering stimulus (e.g. music and letters of the alphabet) causes an immediate additional sensation (e.g. colours and tastes), it has been reported that synaesthesia naturally affects 1–4% of people...