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Variable effects of aging on frontal lobe contributions to memory
Allyson C Rosen1, Matthew W Prull, Ruth O'Hara
1Departments of Psychology, Jordan Hall, Bldg. 420, Stanford University, Stanford, CA 94305, USA.
Neuroreport
|December 25, 2002
Summary
Healthy aging preserves memory by maintaining left prefrontal activation and enhancing right prefrontal activity, compensating for age-related cognitive decline.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Aging Research
Background:
- Declarative memory shows significant decline with age, but individual differences exist.
- Understanding the neural mechanisms of memory in aging is crucial for identifying successful aging patterns.
Purpose of the Study:
- To investigate the neural correlates of memory performance in healthy older adults compared to young adults.
- To identify brain activation patterns associated with successful memory aging.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used to examine brain activity during semantic and non-semantic word encoding.
- Participants included young adults, and healthy elderly adults categorized as high or low memory performers.
Main Results:
- Young adults demonstrated superior memory recall compared to all elderly adults.
- Elderly adults with high memory scores outperformed those with low memory scores.
- High-memory elderly adults exhibited preserved left prefrontal activation and increased right prefrontal activation during semantic encoding relative to young adults.
Conclusions:
- Successful cognitive aging, specifically in declarative memory, is associated with maintained left prefrontal cortex function and compensatory right prefrontal cortex engagement.
- These prefrontal activation patterns in older adults may support effective memory encoding despite age-related changes.