Intraindividual Variability Is a Fundamental Phenomenon of Aging: Evidence from an 8-Year Longitudinal Study across Young, Middle, and Older Adulthood

Autor/inn/en	Bielak, Allison A. M.; Cherbuin, Nicolas; Bunce, David; Anstey, Kaarin J.
Titel	Intraindividual Variability Is a Fundamental Phenomenon of Aging: Evidence from an 8-Year Longitudinal Study across Young, Middle, and Older Adulthood
Quelle	In: Developmental Psychology, 50 (2014) 1, S.143-151 (9 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0012-1649
DOI	10.1037/a0032650
Schlagwörter	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; Australia + Suchen Sie Ihr Suchwort? Ausland; Aging; Altern; Cognitive process; Kognitiver Prozess; Reaktionsvermögen; Age; Difference; Age difference; Altersunterschied; Geschlechterkonflikt; Individueller Unterschied; Longitudinal study; Longitudinal method; Longitudinal methods; Längsschnittuntersuchung; Schwierigkeitsgrad; Bildungsabschluss; Bildungsgut; Bluthochdruck; Hypertonie; Angst; Neurodegenerative Erkrankung; Fragebogen; Australien
Abstract	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. (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2020/1/01