Epilepsy and psychosis.

In an attempt to survey the evidence of causal relationship between epilepsy and chronic psychosis the literature has been searched with respect to frequency of psychoses, psychopathological classifications and correlations between biological and behavioural variables. It is concluded that a unitary theory of aetiology in epileptic psychosis can not be maintained. The psychotic pictures seldom fulfill the Bleulerian concept of schizophrenia, and consequently the term schizophrenia-like should be avoided. With respect to future investigations a prospective research method is advocated.