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In their article, Shergill et al¹ present evidence that auditory hallucinations might be related to a lack of awareness that inner speech has been generated. Using functional magnetic resonance imaging, they compared voxels during spontaneous auditory hallucinations and normal inner speech. Their results indicate that some regions of the auditory and speech processing pathways are abnormally inactivated during hallucinations, whereas other regions are abnormally activated.

Why do the hallucinations seem to be generated independently of the will? One hypothesis² proposes that the reason is a lack of monitoring of self-generated material (consequently creating a weak connection between inner-speech-regions and self-monitoring regions). Other hypotheses³ propose that it is the result of an "epileptiform" focus in auditory cortex that the will cannot control: the connections between regions related to the will action and the auditory cortex are not strong enough to inhibit the focus.

In both cases, independent networks explain the "division . . . [Full Text of this Article]