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Feedback about previous action improves executive functioning in schizophrenia: An analysis of maze solving behaviour
Stefanie Lis1, Stephan Krieger, Johannes Wilhelm
1Centre for Psychiatry, Justus-Liebig-University Giessen, Am Steg 28, 35392 Giessen, Germany. Stefanie.Lis@psychiat.med.uni-giessen.de
Schizophrenia Research
|September 13, 2005
Summary
Schizophrenia patients struggle with executive functions (EF) due to working memory issues. Reducing demands on maintaining past actions improves EF task performance in these patients.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Psychiatry
Background:
- Executive functions (EF) are frequently impaired in schizophrenia.
- Debate exists whether EF deficits stem from core EF impairments or other cognitive functions like working memory.
Purpose of the Study:
- To investigate if working memory deficits, specifically in maintaining previous processing, contribute to executive function impairments in schizophrenia.
- To examine how manipulating working memory load affects EF task performance in schizophrenia patients.
Main Methods:
- Twenty-five schizophrenia patients and 25 healthy controls performed 2D maze tasks.
- Tasks varied in working memory demands by manipulating visual feedback of previous actions.
Main Results:
- Schizophrenia patients showed impaired performance and motor control without feedback (high working memory load).
- With feedback (low working memory load), performance improved to control levels but required more time.
- Healthy controls' performance was unaffected by the feedback manipulation.
Conclusions:
- Reduced working memory demands can facilitate executive function task performance in schizophrenia.
- Schizophrenia is characterized by altered coordination between executive functions and other cognitive processes, particularly working memory.