Hearing Voices - the invisible intruders

Around 10 per cent of the population hear voices that aren't there. Some people can live harmoniously with them, but for those whose voices are associated with a psychiatric illness, they can be frightening and menacingly real. We discuss the latest research on how auditory hallucinations occur in the brain, what it's like to live with voices in your head—and the healing power of the international Hearing Voices Network.