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Impaired hemispheric communication in schizophrenia: a study using the consonant-vowel-consonant task.
James B Lohr1, Joseph B Hellige, Barbara J Cherry
1Department of Psychiatry, San Diego VA Healthcare System, University of California at San Diego, USA.
Schizophrenia Research
|July 11, 2006
Summary
Patients with schizophrenia show impaired interhemispheric cooperation and metacontrol during cognitive tasks. This suggests abnormal brain processing in schizophrenia, unlike in bipolar disorder.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Psychiatry
Background:
- Interhemispheric cooperation is crucial for normal brain function.
- Metacontrol is a proposed mechanism for hemispheric cooperation.
- Schizophrenia is associated with potential interhemispheric interaction deficits.
Purpose of the Study:
- To investigate interhemispheric cooperation and metacontrol in schizophrenia patients.
- To examine hemispheric processing modes using the consonant-vowel-consonant (CVC) task.
- To differentiate schizophrenia findings from those in bipolar disorder.
Main Methods:
- Utilized the consonant-vowel-consonant (CVC) task with trigram presentation to left, right, and both visual fields.
- Analyzed error patterns to infer hemispheric processing strategies.
- Compared schizophrenia patients, bipolar disorder patients, and control groups.
Main Results:
- Control and bipolar groups exhibited typical right-hemisphere-like processing during bilateral stimulation.
- Schizophrenia patients failed to switch to right-hemisphere processing during bilateral stimulation.
- Schizophrenia patients showed no switching or a shift towards left-hemisphere processing.
Conclusions:
- Schizophrenia patients demonstrate abnormalities in cooperative information processing when information is presented bilaterally.
- These abnormalities may indicate metacontrol deficits in hemispheric processing specific to schizophrenia.
- Bipolar disorder patients did not show these specific processing deficits.