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Cognitive Abnormalities in Schizophrenia and Schizophrenia-Like Psychosis of Epilepsy

Received August 8, 2002; revised March 31, 2003, accepted April 15, 2003. From the Department of Psychology, Institute of Psychiatry, King’s College, London Department of Psychiatry, Imperial College Faculty of Medicine, Charing Cross Campus, London; the Department of Psychological Medicine, King’s College Hospital, London; the Institute of Neurology, University College London, Queen Square, London. Address correspondence to Professor Ron, Institute of Neurology, Queen Square, London WC1N 3BG, UK; m.ron{at}ion.ucl.ac.uk (E-mail).

Twenty-six patients with schizophrenia and 12 patients with schizophrenia-like psychosis of epilepsy (SLPE) were compared to 38 healthy volunteers and 12 nonpsychotic patients with epilepsy to determine the contribution of psychosis to the pattern of cognition. Tests of memory and executive function were used. The schizophrenic group was more cognitively impaired than the SLPE and comparison groups. The profile of neuropsychological impairment in SLPE resembled that of schizophrenia and is unlikely to be explained solely by temporal lobe dysfunction. These results do not support the concept of SLPE as an independent nosological entity.

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