Which of the following behavioural problems would suggest an organic brain lesion
Visual hallucinations are more common in acute organic states with clouding of consciousness than in functional psychosis. Visual hallucinations are extremely rare in schizophrenia, so much so that they should raise a doubt about the diagnosis. Fish's Clincal Psychopathology 3rd edition, pages 23,24.
Formal thought disorder
Auditory hallucinations
Visual hallucinations
Depression
Organic mental disorders