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Release from proactive interference: determinants of performance and neuropsychological correlates
C Randolph1, J M Gold, C J Carpenter
1Clinical Brain Disorders Branch, NIMH, Washington, DC.
Journal of Clinical and Experimental Neuropsychology
|September 1, 1992
Summary
Patients with schizophrenia show impaired release from proactive interference (PI) on a short-term memory task. This impairment may stem from general task difficulty rather than specific frontal-lobe deficits.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Psychiatry
Background:
- Proactive interference (PI) affects short-term memory recall.
- Release from PI is a key measure in memory research.
- Schizophrenia involves cognitive deficits, including memory and frontal-lobe functions.
Purpose of the Study:
- To investigate release from proactive interference (PI) in patients with schizophrenia (SC).
- To determine if PI release deficits in SC are linked to memory and frontal-lobe impairments.
- To assess the utility of the Wickens modification of the Brown-Peterson task for studying PI in patient groups.
Main Methods:
- Utilized the Wickens (1970) modification of the Brown-Peterson short-term memory task.
- Compared performance of patients with SC to normal controls.
- Conducted correlational analyses between task performance and neuropsychological measures.
Main Results:
- Patients with SC exhibited significantly less release from PI compared to controls.
- Initial trial performance predicted subsequent performance, suggesting PI release may reflect general task ability.
- In SC patients, initial trial performance correlated with memory and frontal-lobe measures after controlling for IQ.
Conclusions:
- Findings support the link between PI release and memory/frontal-lobe functions.
- Failure to release PI in SC may be secondary to difficulties with the core Brown-Peterson task.
- The Brown-Peterson task performance may be a more reliable indicator of relevant neuropsychological functions than PI release.