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      Neurocognitive deficit in schizophrenia: a quantitative review of the evidence.

      1 ,
      Neuropsychology
      American Psychological Association (APA)

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          Abstract

          The neurocognitive literature on test performance in schizophrenia is reviewed quantitatively. The authors report 22 mean effect sizes from 204 studies to index schizophrenia versus control differences in global and selective verbal memory, nonverbal memory, bilateral and unilateral motor performance, visual and auditory attention, general intelligence, spatial ability, executive function, language, and interhemispheric tactile-transfer test performance. Moderate to large raw effect sizes (d > .60) were obtained for all 22 neurocognitive test variables, and none of the associated confidence intervals included zero. The results indicate that schizophrenia is characterized by a broadly based cognitive impairment, with varying degrees of deficit in all ability domains measured by standard clinical tests.

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          Author and article information

          Journal
          Neuropsychology
          Neuropsychology
          American Psychological Association (APA)
          0894-4105
          0894-4105
          Jul 1998
          : 12
          : 3
          Affiliations
          [1 ] Department of Psychology, York University, Toronto, Ontario, Canada. walterh@yorku.ca
          Article
          10.1037//0894-4105.12.3.426
          9673998
          19b048eb-a204-497d-8296-30447a64ad7a
          History

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