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Inconsistency in reaction time across the life span
Benjamin R Williams1, David F Hultsch, Esther H Strauss
1Department of Psychology, University of Victoria, Victoria, BC, Canada. benjy@uvic.ca
Neuropsychology
|January 20, 2005
Summary
Reaction time inconsistency shows a U-shaped pattern with age, decreasing in childhood and increasing in adulthood. This variability is independent of practice and fatigue, offering insights into cognitive processes.
Area of Science:
- Cognitive Psychology
- Developmental Psychology
- Human Performance
Background:
- Reaction time (RT) is a fundamental measure in cognitive psychology.
- Variability in RT across trials can provide insights into underlying cognitive processes.
- Understanding age-related changes in RT inconsistency is crucial for developmental and aging research.
Purpose of the Study:
- To analyze age-related patterns of inconsistency in 2-choice reaction time (RT) data.
- To investigate the relationship between age and RT inconsistency across a wide age range.
- To explore the cognitive processes contributing to RT variability at different life stages.
Main Methods:
- Analysis of 2-choice reaction time data from 273 participants (ages 6-81).
- Statistical modeling to examine the relationship between age and RT inconsistency.
- Examination of factors such as practice, fatigue, and mean performance level.
Main Results:
- A U-shaped curve was observed between age and RT inconsistency.
- Inconsistency decreased with age in childhood and increased in adulthood.
- Evidence for general and specific variability processes in younger individuals (<21 years), and primarily specific processes (e.g., attentional lapses) in older adults (≥21 years).
- Age-related differences in inconsistency were independent of practice, fatigue, and mean RT.
Conclusions:
- RT inconsistency follows a distinct U-shaped trajectory across the human lifespan.
- Cognitive control mechanisms, potentially including attentional processes, contribute differently to RT variability across development and adulthood.
- Moment-to-moment performance fluctuations are critical for a comprehensive understanding of cognitive function and aging.