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Lateralized visual-field inattention in schizophrenia
D S Lobel1, R M Swanda, M F Losonczy
1Department of Psychology, FDR Veterans Affairs Hospital, Montrose, New York 10548.
Perceptual and Motor Skills
|August 1, 1994
Summary
Schizophrenia patients show impaired verbal skills, often linked to left brain damage. This study confirms a selective left-hemispheric deficit in schizophrenic patients using a visual attention task.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Psychiatry
Background:
- Schizophrenia is associated with verbal deficits.
- These deficits are often attributed to left cerebral hemisphere dysfunction.
- Previous research suggests left-hemisphere dominance for verbal processing in right-handed individuals.
Purpose of the Study:
- To directly assess left-hemispheric integrity in schizophrenic patients.
- To investigate hemispheric differences in sustained attention in schizophrenia.
- To explore the relationship between verbal deficits and hemispheric function in schizophrenia.
Main Methods:
- The study involved 40 schizophrenic patients.
- The Weintraub Cancellation Tasks were used to assess sustained attention.
- Performance was evaluated across both left and right cerebral hemispheres by analyzing visual field errors.
Main Results:
- Schizophrenic patients made significantly more omission errors in the right visual field compared to the left.
- This pattern indicates greater impairment in the left hemisphere relative to the right hemisphere.
- The findings provide direct evidence of selective left-hemispheric dysfunction.
Conclusions:
- The results support the hypothesis of selective left-hemispheric impairment in schizophrenia.
- This impairment in sustained attention may contribute to the observed verbal deficits.
- Further research is needed to elucidate the precise mechanisms underlying these hemispheric differences.