The British Journal of Psychiatry
Overinclusive Thinking in Mania and Schizophrenia
N. J. C. ANDREASEN, PAULINE S. POWERS

Abstract

Thirty-one patients, 16 manics and 15 schizophrenics, and 15 normal controls were evaluated with the Payne battery of tests for overinclusive thinking. The manics showed significantly more overinclusive thinking than the schizophrenics on two out of three tests in the battery and on total transformed score. Schizophrenics were underinclusive when compared with normal controls, and manics were overinclusive. These data suggest that overinclusiveness is not specific to schizophrenia and that it is associated with illnesses which remit or have a good prognosis.