Given her deafness, the auditory part of the brain, deprived of its usual input, had started to generate a spontaneous activity of its own, and this took the form of musical hallucinations, mostly musical memories from her earlier life. The brain needed to stay incessantly active, and if it was not getting its usual stimulation..., it would create its own stimulation in the form of hallucinations.
Oliver SacksMusic can lift us out of depression or move us to tears - it is a remedy, a tonic, orange juice for the ear.
Oliver SacksI think there's probably always been visions and voices, and these were variously ascribed to the divine or demonic or the muses. I think many poets still feel they depend on an inner voice, or a voice which tells them what to do.
Oliver Sacks