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Multiple measures of hemispheric dysfunction in schizophrenia and depression.
Psychological Medicine
|May 1, 1983
Summary
Schizophrenia and depression impact brain lateralization differently. Schizophrenics showed impaired left hemisphere function in perceptual tasks, while depressives exhibited altered electrodermal activity, suggesting distinct laterality effects across disorders.
Area of Science:
- Neuroscience
- Psychopathology
- Cognitive Psychology
Background:
- Lateral hemispheric function is crucial in understanding neurological and psychiatric disorders.
- Previous research has explored various electrodermal, electroencephalographic, and perceptual measures of brain lateralization in psychopathology.
- The interrelationship and distinctiveness of these laterality measures in clinical populations remain incompletely understood.
Purpose of the Study:
- To investigate and compare measures of lateral hemispheric function in chronic schizophrenics, depressives, and normal controls.
- To examine the effects of medication on laterality measures in schizophrenic patients.
- To determine if different laterality measures assess the same underlying phenomenon in psychopathology.
Main Methods:
- Collected electrodermal, electroencephalographic, and perceptual data from schizophrenic, depressive, and normal groups on two separate occasions.
- Administered a drug 'washout' for a subset of schizophrenic participants prior to the first session.
- Analyzed laterality effects across different measures and between diagnostic groups.
Main Results:
- Measures of laterality were not strongly intercorrelated across the different assessment methods.
- Schizophrenics exhibited different laterality effects compared to normals in a perceptual task, with apparent right hemisphere dominance.
- Depressives showed distinct electrodermal laterality effects (diminished right-hand activity) compared to normals.
- Medication in schizophrenics reduced electrodermal activity but did not significantly alter laterality.
Conclusions:
- Different measures of laterality may not capture the same aspect of hemispheric function in psychopathology.
- Schizophrenia and depression present with distinct patterns of hemispheric lateralization.
- The findings challenge the assumption that various laterality measures are interchangeable in psychopathology research.