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Item and source memory: differential age effects revealed by event-related potentials
C T Trott1, D Friedman, W Ritter
1Cognitive Electrophysiology Laboratory, New York State Psychiatric Institute, New York City 10032, USA.
Neuroreport
|November 14, 1997
Summary
Older adults show greater memory for details than for context compared to younger adults. This age-related decline in source memory may stem from reduced prefrontal cortex activity.
Area of Science:
- Cognitive Neuroscience
- Neuropsychology
- Human Memory
Background:
- Age-related memory decline is a significant concern.
- Understanding the neural basis of these differences is crucial for developing interventions.
- Source memory, the ability to recall contextual details of an experience, is particularly vulnerable to aging.
Purpose of the Study:
- To investigate the neural substrates of age-related differences in memory.
- To compare item memory and source memory performance between young and older adults.
- To examine event-related potential (ERP) correlates of memory recognition and source attribution.
Main Methods:
- Event-related potentials (ERPs) were recorded from young and older adults.
- A recognition memory paradigm was employed, testing both item and temporal source memory.
- Participants studied and recalled nouns and the temporal list in which they occurred.
Main Results:
- Older adults exhibited a greater decrement in source memory compared to item memory relative to young adults.
- Both age groups showed similar posterior-maximal old/new ERP effects.
- Only young adults produced a frontal-maximal, late-onset old/new ERP effect modulated by source attribution.
Conclusions:
- Age-related differences in explicit memory may be linked to a deficit in prefrontal cortical function.
- The prefrontal cortex appears critical for successful source memory retrieval.
- ERP findings suggest distinct neural mechanisms underlying memory in aging.