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Short-term longitudinal change in cognitive performance in later life
D F Hultsch1, C Hertzog, B J Small
1Department of Psychology, University of Victoria, British Columbia, Canada.
Psychology and Aging
|December 1, 1992
Summary
Cognitive aging leads to declines in working memory, verbal fluency, and world knowledge in adults aged 55-86. These changes occurred over three years, with some differences observed between birth cohorts.
Area of Science:
- Gerontology
- Cognitive Psychology
- Neuroscience
Background:
- Cognitive abilities naturally change with age.
- Understanding age-related cognitive decline is crucial for maintaining quality of life.
Purpose of the Study:
- To examine changes in cognitive performance over a 3-year period in older adults.
- To identify specific cognitive domains that show decline.
- To investigate potential cohort effects on cognitive aging.
Main Methods:
- Longitudinal study of 328 community-dwelling adults aged 55-86.
- Assessment of verbal processing time, working memory, implicit memory, vocabulary, verbal fluency, world knowledge, reading comprehension, word recall, and text recall.
- Statistical analysis including step-down analysis to control for covariates.
Main Results:
- Significant average decline observed in working memory, verbal fluency, and world knowledge.
- Interactions indicated greater decline in working memory for an earlier-born cohort.
- Declines in working memory, verbal fluency, and world knowledge remained significant even after accounting for processing time.
Conclusions:
- Working memory, verbal fluency, and world knowledge are susceptible to decline in older adulthood.
- Cohort differences may influence the rate of cognitive aging.
- These cognitive functions show resilience to declines in other cognitive domains.