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Mediators of long-term memory performance across the life span
D C Park1, A D Smith, G Lautenschlager
1Department of Psychology, University of Michigan, Ann Arbor 48109, USA. Denise@umich.edu
Psychology and Aging
|December 1, 1996
Summary
Cognitive aging impacts long-term memory. Both processing speed and working memory are crucial, but their influence on memory performance varies by task type, affecting older adults significantly.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Gerontology
Background:
- Episodic long-term memory declines with age.
- Understanding the underlying cognitive processes is crucial for interventions.
- Individual differences in cognitive abilities play a role in memory performance.
Purpose of the Study:
- To investigate the component processes predicting episodic long-term memory performance.
- To examine the roles of working memory and perceptual speed in age-related memory changes.
- To determine how these cognitive constructs relate to different types of long-term memory tasks.
Main Methods:
- An individual-differences approach with 301 participants (ages 20-90).
- A comprehensive 7-hour cognitive battery administered over 3 days.
- Latent-construct structural equation modeling to analyze cognitive relationships.
Main Results:
- Perceptual speed was a significant predictor across all memory tasks, mediating age-related variance.
- Working memory was essential for free and cued recall but not spatial memory.
- Age-related cognitive decline in memory is explained by both speed and working memory, with task-dependent contributions.
Conclusions:
- Processing speed and working memory are fundamental to cognitive aging and memory function.
- The relative importance of speed and working memory differs based on the specific long-term memory task.
- These findings highlight the heterogeneous nature of age-related memory changes.