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There are hallucinations and there are hallucinations

There are two separate phenomena being discussed here.  One is the auditory
sensation of a sound being 'out there in the world', which was the original
problem mentioned.  The other is what Pierre and some others have been
talking about, which is the sound occurring in one's head, but it is not
taken as a real sensation.  These are quite different and should be treated
as such.  I would suspect the fMRI of the first type of 'hallucination'
would show acitivity in the auditory cortex.  In contrast, visual
halluciations are only perceived as being 'in the world.'  Perhaps this
says something basic about the distinct nature of the two modalities.