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Working memory control in patients with schizophrenia: a PET study during a random number generation task.
E Artiges1, P Salamé, C Recasens
1Département de Recherche en Imagerie, Pharmacologie et Physiologie, Strasbourg, France.
The American Journal of Psychiatry
|August 31, 2000
Summary
Schizophrenia patients show impaired working memory control due to cinguloparietal dysfunction. Brain imaging revealed differences in anterior cingulate and superior parietal activation during a random number generation task.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Psychiatry
Background:
- Working memory is crucial for cognitive functions.
- Schizophrenia is associated with deficits in executive functions, including working memory.
- Understanding the neural underpinnings of these deficits is vital for developing targeted interventions.
Purpose of the Study:
- To identify specific brain regions associated with working memory control impairments in schizophrenia patients.
- To investigate the neural correlates of deficient random number generation in schizophrenia.
Main Methods:
- Positron emission tomography (PET) was used to measure regional cerebral blood flow.
- Eight men with stabilized schizophrenia and eight healthy male controls performed a graded random number generation task.
- Analysis focused on covariations between response randomness and regional brain activation.
Main Results:
- A distinct pattern of covariation between response randomness and brain activation was observed in the anterior cingulate and superior parietal regions.
- These differences in activation patterns were significant between schizophrenia patients and healthy controls.
Conclusions:
- The findings suggest a cinguloparietal dysfunction contributes to impaired working memory control in schizophrenia.
- This dysfunction is evident during tasks requiring random response generation.
- Targeting cinguloparietal pathways may be a potential therapeutic strategy.