ERIC Number: EJ1050273
Record Type: Journal
Publication Date: 2014-Jan
Abstractor: As Provided
Reference Count: 48
Intraindividual Variability Is a Fundamental Phenomenon of Aging: Evidence from an 8-Year Longitudinal Study across Young, Middle, and Older Adulthood
Bielak, Allison A. M.; Cherbuin, Nicolas; Bunce, David; Anstey, Kaarin J.
Developmental Psychology, v50 n1 p143-151 Jan 2014
Moment-to-moment intraindividual variability (IIV) in cognitive speed is a sensitive behavioral indicator of the integrity of the aging brain and brain damage, but little information is known about how IIV changes from being relatively low in young adulthood to substantially higher in older adulthood. We evaluated possible age group, sex, and task differences in IIV across adulthood using a large, neurologically normal, population-based sample evaluated thrice over 8 years. Multilevel modeling controlling for education, diabetes, hypertension, and anxiety and depressive symptoms showed expected age group differences in baseline IIV across the adult lifespan. Increase in IIV was not found until older adulthood on simple tasks but was apparent even in the 40s on a more complex task. Females were more variable than males but only at baseline. IIV in cognitive speed is a fundamental behavioral characteristic associated with growing older, even among healthy adults.
Descriptors: Foreign Countries, Aging (Individuals), Cognitive Processes, Reaction Time, Age Differences, Gender Differences, Individual Differences, Longitudinal Studies, Hierarchical Linear Modeling, Difficulty Level, Educational Attainment, Diabetes, Hypertension, Anxiety, Depression (Psychology), Neurological Impairments, Questionnaires
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Authoring Institution: N/A
Identifiers - Location: Australia