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Age differences and changes in reaction time: the Baltimore Longitudinal Study of Aging
J L Fozard1, M Vercryssen, S L Reynolds
1National Institutes of Health, National Institute on Aging, Nathan W. Shock Laboratories of the Gerontology Research Center, Baltimore.
Journal of Gerontology
|July 1, 1994
Summary
Reaction time (RT) slows with age, with simple RT increasing by 0.5 msec/yr and disjunctive RT by 1.6 msec/yr. This age-related slowing and increased variability in cognitive performance is continuous and task-dependent.
Area of Science:
- Neuroscience
- Human Aging
- Cognitive Psychology
Background:
- Reaction time (RT) is a fundamental measure of cognitive processing speed.
- Understanding age-related changes in RT is crucial for assessing cognitive health across the lifespan.
- Previous research suggests RT slows with age, but continuous processes and variability require further investigation.
Purpose of the Study:
- To analyze cross-sectional and longitudinal changes in auditory reaction time (RT) across the adult lifespan.
- To investigate the relationship between age, task complexity, sex, and RT.
- To examine age-associated increases in RT variability and error rates.
Main Methods:
- Analysis of auditory reaction time (RT) data from 1,265 community-dwelling volunteers aged 17-96.
- Cross-sectional analyses examining RT differences across age decades and sexes.
- Longitudinal analyses tracking RT changes within participants over an eight-year period.
Main Results:
- Significant slowing of simple reaction time (SRT) and disjunctive reaction time (DRT) was observed across age decades for both males and females.
- Longitudinal data revealed consistent RT slowing and increased variability with advancing age.
- Males exhibited faster RTs than females across all age groups, tasks, and testing visits. RTs increased approximately 0.5 msec/yr for SRT and 1.6 msec/yr for DRT starting around age 20.
- Error rates increased with age, indicating that slowing was not a trade-off for improved accuracy.
Conclusions:
- Behavioral slowing is a continuous process throughout adulthood, accelerating with age.
- Age-associated increases in within-participant variability are a key characteristic of cognitive aging.
- Task complexity significantly influences the degree of age-related slowing, suggesting greater reliance on higher central nervous system functions.
- Sex differences in RT persist, with males generally demonstrating faster responses than females.