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Cognition in schizophrenia and schizo-affective disorder: impairments that are more similar than different

  • A. Owoso (a1), C. S. Carter (a2), J. M. Gold (a3), A. W. MacDonald (a4), J. D. Ragland (a2), S. M. Silverstein (a5), M. E. Strauss (a6) and D. M. Barch (a1)...

Abstract

Background

Cognition is increasingly being recognized as an important aspect of psychotic disorders and a key contributor to functional outcome. In the past, comparative studies have been performed in schizophrenia and schizo-affective disorder with regard to cognitive performance, but the results have been mixed and the cognitive measures used have not always assessed the cognitive deficits found to be specific to psychosis. A set of optimized cognitive paradigms designed by the Cognitive Neuroscience Test Reliability and Clinical Applications for Schizophrenia (CNTRACS) Consortium to assess deficits specific to schizophrenia was used to measure cognition in a large group of individuals with schizophrenia and schizo-affective disorder.

Method

A total of 519 participants (188 with schizophrenia, 63 with schizo-affective disorder and 268 controls) were administered three cognitive paradigms assessing the domains of goal maintenance in working memory, relational encoding and retrieval in episodic memory and visual integration.

Results

Across the three domains, the results showed no major quantitative differences between patient groups, with both groups uniformly performing worse than healthy subjects.

Conclusions

The findings of this study suggests that, with regard to deficits in cognition, considered a major aspect of psychotic disorder, schizophrenia and schizo-affective disorder do not demonstrate major significant distinctions. These results have important implications for our understanding of the nosological structure of major psychopathology, providing evidence consistent with the hypothesis that there is no natural distinction between cognitive functioning in schizophrenia and schizo-affective disorder.

Copyright

Corresponding author

*Address for correspondence: A. Owoso, M.D., Department of Psychiatry, Washington University School of Medicine, 660 S. Euclid Ave., Campus Box 8134, St Louis, MO 63110, USA. (Email: owosoa@psychiatry.wustl.edu)

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Keywords

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Supplementary materials

Owoso Supplementary Material
Tables S1-S4

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Supplementary materials

Owoso Supplementary Material
Figure S1: Graph showing performance on Dot Probe Expectancy (DPX) task with number of errors for each of the four trial types (AX, AY, BX, BY). Error bars are standard errors.

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Supplementary materials

Owoso Supplementary Material
Figure S2: Bar graph illustrating performance in both encoding conditions of the item recognition portion of the Relational and Item Specific Encoding (RISE) task. Asterisk (*) significances are across participant groups while arrowhead (^) significances are within groups.

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Owoso Supplementary Material
Figure S3: Graph of mean accuracy scores across different jitter degree conditions of the Jittered Orientation Visual Integration (JOVI) task. Error bars are standard errors.

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