Hearing Voices: The Histories, Causes and Meanings of Auditory Verbal Hallucinations, Simon McCarthy-Jones, Cambridge University Press, page 362

What is most problematic for the development of any inner speech account of auditory hallucinations is that we still know next to nothing about thought itself. Until we have some idea of the nature of thought and how the brain produces it, it remains very hard to assess how unusual manifestations of it result in auditory hallucinations. How can we know how thoughts relate to voices until we know what thinking itself is like? We have already seen how a traditional corollary discharge account views auditory hallucinations as resulting from efference copy signals from inner speech productions in left Broca’s area not being communicated correctly to the left speech perception regions of the brain, but what other accounts may we consider?

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