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The impact of performance uncertainty on the postimperative negative variation
C Klein1, B Rockstroh, R Cohen
1Department of Psychology, University of Konstanz, Germany.
Psychophysiology
|July 1, 1996
Summary
Schizophrenia patients show a larger post-imperative negative variation (PINV) response to ambiguous signals compared to healthy controls. This suggests reduced thresholds for performance and action uncertainty in schizophrenia.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Psychiatry
Background:
- The post-imperative negative variation (PINV) is an electroencephalogram (EEG) component sensitive to cognitive processes.
- Schizophrenia is associated with various cognitive deficits, potentially affecting EEG responses.
Purpose of the Study:
- To investigate the impact of signal clarity (ambiguous vs. clear go/no-go signals) on PINV in schizophrenia patients.
- To compare PINV generation between chronic schizophrenic patients and healthy controls.
Main Methods:
- A delayed matching-to-sample task was employed with varying S2 signal clarity (clear match, ambiguous size, no-go).
- EEG was recorded from multiple scalp sites in 11 schizophrenia patients and 13 healthy controls.
- Contingent negative variation (CNV) and PINV amplitudes were analyzed.
Main Results:
- Patients with schizophrenia exhibited a more pronounced PINV compared to controls.
- Ambiguity in the to-be-matched S2 significantly increased PINV amplitude in both groups.
- A clear no-go signal elicited only a small PINV, with differential effects observed for ambiguity and no-go signals.
Conclusions:
- Performance and action uncertainty contribute to PINV generation.
- Schizophrenia patients appear to have reduced thresholds for both performance and action uncertainty, as reflected in their PINV responses.
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