Helen Thomson writes that all documented pain synaesthetes suffered traumatic pain before developing the condition: «Many are amputees, and their... (newscientist.com)
We «see» letters, words or numbers as colours; other synaesthetes «taste» shapes, «hear» colours and so on. (newscientist.com)
Synaesthetes make unusual connections between different senses. (newscientist.com)