Related Experiment Videos
Is Wisconsin Card Sorting Test performance related to 'working memory' capacity?
P Stratta1, E Daneluzzo, P Prosperini
1Department of Psychiatry at S. Salvatore Hospital-Institute of Experimental Medicine, University of L'Aquila, Italy.
Schizophrenia Research
|November 28, 1997
Summary
This study found that working memory impairment does not explain poor performance on the Wisconsin Card Sorting Test (WCST) in schizophrenic patients. Executive dysfunction and working memory appear to be distinct neurocognitive constructs.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Psychiatry
Background:
- The Wisconsin Card Sorting Test (WCST) is a complex measure of executive function.
- Impaired performance on the WCST is common in schizophrenia, with working memory deficits hypothesized as a cause.
- The relationship between working memory, executive function, and clinical symptoms in schizophrenia requires further investigation.
Purpose of the Study:
- To assess the relationship between working memory capacity and WCST performance in individuals with schizophrenia.
- To explore the link between cognitive dysfunction and clinical symptomatology in schizophrenia.
- To determine if working memory impairment underlies executive dysfunction on the WCST in schizophrenia.
Main Methods:
- Administered the WCST, Digit Span Test (Forward and Backward), Digit Symbol Substitution Test, and a Visuo-Spatial working memory test to 30 schizophrenic patients and 25 healthy controls.
- Utilized the Krawiecka Manchester Scale (K-MS) and the Strauss and Carpenter Outcome Scale for clinical assessment.
- Analyzed correlations between neuropsychological test results and clinical measures.
Main Results:
- Schizophrenic patients showed significant deficits across all neuropsychological variables compared to controls.
- WCST performance did not correlate significantly with verbal or visuo-spatial working memory measures.
- No significant relationship was found between neuropsychological performance and clinical symptomatology (K-MS).
- WCST and Digit Symbol Substitution Test (DSST) scores correlated significantly with the outcome measure.
Conclusions:
- The findings do not support the hypothesis that WCST-assessed executive dysfunction in schizophrenia is due to working memory impairment.
- Executive function and working memory may represent distinct neurocognitive constructs in schizophrenia.
- WCST and DSST performance show relevance to patient outcomes in schizophrenia.