Executive control in chronic schizophrenia: A perspective from manual stimulus-response compatibility task
Simone D Behrwind1, Manuel Dafotakis, Sarah Halfter
1Department of Psychiatry & Psychotherapy, RWTH Aachen University, Aachen, Germany. SEickhoff@ukaachen.de
Behavioural Brain Research
|April 26, 2011
Summary
Schizophrenia patients show executive control deficits, not isolated motor impairments. Their performance declines with task complexity, suggesting prefrontal cortex dysfunction.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Psychiatry
Background:
- Antisaccade deficits are common in schizophrenia.
- The cause remains unclear: oculomotor, psychomotor, or executive dysfunction?
Purpose of the Study:
- Investigate executive control deficits in schizophrenia.
- Differentiate between oculomotor, psychomotor, and executive impairments.
Main Methods:
- 28 chronic schizophrenia patients and 28 matched controls.
- Administered a stimulus-response compatibility (SRC) task and neuropsychological tests.
Main Results:
- Patients struggled with tasks requiring multiple component manipulation.
- Schizophrenia patients showed worse SRC performance and higher error increases with complexity.
- Reaction times did not differ between groups.
Conclusions:
- Results rule out isolated oculomotor or general psychomotor deficits.
- Impairment correlates with executive control demands, linked to prefrontal cortex dysfunction.
