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Efficiency of working memory encoding in twins discordant for schizophrenia
Peter Bachman1, Junghoon Kim, Cindy M Yee
1Department of Psychology, University of California, Los Angeles, Los Angeles, CA 90095-1563, United States. bachman@psych.ucla.edu
Psychiatry Research
|October 27, 2009
Summary
Schizophrenia patients show reduced neurocognitive efficiency, particularly in working memory tasks. This inefficiency, observed in electroencephalogram (EEG) data, suggests a potential genetic link and impacts stimulus processing.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Psychology
Background:
- Schizophrenia is associated with neurocognitive deficits.
- Relatives of patients may also exhibit cognitive inefficiencies.
- Sensitivity to task demands might be heightened in affected individuals.
Purpose of the Study:
- To investigate neurocognitive efficiency in schizophrenia patients and their co-twins.
- To examine working memory performance using electrophysiological measures.
- To explore the role of task demands in cognitive dysfunction.
Main Methods:
- Utilized electrophysiological data (event-related potentials - ERPs) from schizophrenia patients, their co-twins, and healthy controls.
- Administered a spatial working memory task with varying load conditions.
- Measured ERPs during stimulus encoding and delay periods.
Main Results:
- Schizophrenia patients demonstrated a significant load effect in slow-wave ERP activity during encoding and delay periods.
- Co-twins showed intermediate sensitivity to memory load.
- Healthy controls exhibited no significant load effect.
Conclusions:
- Findings support an inefficiency model of neurocognitive dysfunction in schizophrenia.
- The observed pattern suggests a link to the disorder's pathogenesis and inheritance.
- Inefficiency may stem from disruptions in stimulus representation consolidation during working memory.
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