Abstract

A statistical study of hallucinations in 1009 cases of manicdepressive psychoses with 1408 cases of schizophrenia and 496 cases of general paresis as controls leads to the following conclusions: Hallucinations are absent in 70 per cent of the males and 63 per cent of the females in the manic-depressive group as compared with 25 per cent of the males and 19 per cent of the females in schizophrenia, and 73 per cent of the males and 58 per cent of the females in general paresis. The most common type of hallucinations which occur in the manic-depressive psychoses is the auditory type, which is present in 16 per cent of the males and 18 per cent of the females. Auditory hallucinations likewise appear most frequently in schizophrenia, there being 50 per cent of the males and 56 per cent of the females having such hallucinations. The incidence of auditory hallucinations in general paresis is nearly the same as in the manicdepressive psychoses. Visual hallucinations are the next most common type of hallucination ...

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