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Dichotic perception: evidence for right hemisphere dysfunction in affective psychosis
The British Journal of Psychiatry : the Journal of Mental Science
|September 1, 1979
Summary
Affective psychotic patients show abnormal ear asymmetries, similar to those with right temporal lobe damage. Schizophrenic patients, however, did not exhibit these auditory perceptual differences.
Area of Science:
- Neuroscience
- Psychiatry
- Auditory Perception
Background:
- Lateralized hemispheric dysfunction is linked to various psychiatric disorders.
- Auditory processing, particularly via dichotic listening tasks, can reveal hemispheric asymmetries.
Purpose of the Study:
- To investigate the relationship between hemispheric dysfunction and psychiatric diagnoses.
- To examine ear asymmetries in affective psychotic and schizophrenic patients using dichotic listening tasks.
Main Methods:
- Utilized dichotic click summation and dichotic competing message tasks to assess ear asymmetries.
- Compared auditory perceptual asymmetries in affective psychotic patients, schizophrenic patients, and normal controls.
Main Results:
- Affective psychotic patients displayed ear asymmetries comparable to individuals with right temporal lobe lesions.
- Schizophrenic patients and normal controls showed different patterns of ear asymmetry compared to affective psychotic patients.
- No abnormal auditory perceptual asymmetries were found in schizophrenic patients.
Conclusions:
- Specific patterns of hemispheric dysfunction, indicated by ear asymmetries, may be associated with affective psychotic disorders.
- Auditory perceptual asymmetries do not appear to be a characteristic feature of schizophrenia.