Variability in reaction time performance of younger and older adults.

By D. Hultsch, S. MacDonald, Roger A. Dixon. The journals of gerontology. Series B, Psychological sciences and social sciences, 2002

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Age and sex differences in reaction time in adulthood: results from the United Kingdom Health and Lifestyle Survey. (2006, result): “Hultsch, MacDonald, and Dixon (2002) reported a similar finding: There were no age-related increases in inconsistency for the fastest 20% of response latencies, but marked increases for the slowest 20% of responses.”
An EZ-diffusion model for response time and accuracy (2007, background): “, Laming, 1973, p. 192, footnote 7; Link & Heath, 1975). 5. The close conceptual link between sequential sampling models (e.g., the diffusion model) and signal detection theory has also been a motivating factor in the work of Pew (1969), Emerson (1970), Balakrishnan et al.”
The Relevance of Control Beliefs for Health and Aging (2011, background): “Some studies suggest that older adults show greater intraindividual (within-person) variability in cognitive performance domains (Hultsch et al., 2002; nesselroade & Salthouse, 2004), but less in the affective domains (Röcke et al.”
Assessing intraindividual variability in sustained attention: reliability, relation to speed and accuracy, and practice effects (2007, background): “Non-normal populations like older adults or neurologically impaired patients would not allow to determine psychometric retest reliability, since these populations are assumed to be largely inconsistent over several testing occasions (Bunce et al., 2004; Burton et al., 2006; Hultsch et al., 2002).”