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Remember and know judgments during recognition in chronic schizophrenia
Theo G M van Erp1, Tyler A Lesh, Barbara J Knowlton
1Department of Psychology, UCLA, Los Angeles, CA 90095, USA. vanerp@psych.ucla.edu
Schizophrenia Research
|October 30, 2007
Summary
Schizophrenia patients show impaired memory recall, relying more on familiarity than recollection. This study used the Remember-Know paradigm to investigate memory deficits in schizophrenia.
Area of Science:
- Cognitive Neuroscience
- Psychiatry
- Neuropsychology
Background:
- Memory deficits are a core feature of schizophrenia.
- A leading hypothesis suggests reduced recollection and increased familiarity reliance in schizophrenia memory retrieval.
Purpose of the Study:
- To investigate memory retrieval processes in chronic schizophrenia using the Remember-Know paradigm.
- To compare recollection and familiarity-based memory in schizophrenia patients versus healthy controls.
Main Methods:
- Administered the Remember-Know (R-K) paradigm to 35 schizophrenia patients and 35 healthy controls.
- Collected "remember" and "know" judgments alongside forced-choice recognition of learning episode details.
- Analyzed response types and recalled information for differences between groups.
Main Results:
- Schizophrenia patients exhibited significantly fewer "remember" responses and more "know" responses compared to controls.
- Patients recalled fewer episode details for "remember" responses and recognized fewer inter-item stimulus features.
- Signal Detection analyses indicated reduced recollection but intact familiarity in schizophrenia.
Conclusions:
- Findings support a deficit in recollection and increased reliance on familiarity in schizophrenia recognition memory.
- Impaired ability to organize and integrate relational information during learning and retrieval is suggested.
- These memory alterations are crucial for understanding cognitive dysfunction in schizophrenia.
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