Variability in Reaction Time Performance of Younger and Older Adults

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ID: 304381
2002
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Abstract
Age differences in three basic types of variability were examined: variability between persons (diversity), variability within persons across tasks (dispersion), and variability within persons across time (inconsistency). Measures of variability were based on latency performance from four measures of reaction time (RT) performed by a total of 99 younger adults (ages 17–36 years) and 763 older adults (ages 54–94 years). Results indicated that all three types of variability were greater in older compared with younger participants even when group differences in speed were statistically controlled. Quantile-quantile plots showed age and task differences in the shape of the inconsistency distributions. Measures of within-person variability (dispersion and inconsistency) were positively correlated. Individual differences in RT inconsistency correlated negatively with level of performance on measures of perceptual speed, working memory, episodic memory, and crystallized abilities. Partial set correlation analyses indicated that inconsistency predicted cognitive performance independent of level of performance. The results indicate that variability of performance is an important indicator of cognitive functioning and aging.
Reference Key
openalex_W1982665255 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors David F. Hultsch, Stuart MacDonald, R. A. Dixon
Journal the journals of gerontology series b, psychological sciences and social sciences
Year 2002
DOI
10.1093/geronb/57.2.p101
URL
https://doi.org/10.1093/geronb/57.2.p101
Keywords Keywords not found

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