Neurocognitive markers of cognitive impairment: exploring the roles of speed and inconsistency.

Neurocognitive markers of cognitive impairment: exploring the roles of speed and inconsistency. Research Abstract Details 

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Neurocognitive markers of cognitive impairment: exploring the roles of speed and inconsistency. Abstract Text:

Roger A Dixon,Douglas D Garrett,Tanya L Lentz,Stuart W S MacDonald,Esther Strauss,David F Hultsch,

A well-known challenge for research in the cognitive neuropsychology of aging is to distinguish between the deficits and changes associated with normal aging and those indicative of early cognitive impairment. In a series of 2 studies, the authors explored whether 2 neurocognitive markers, speed (mean level) and inconsistency (intraindividual variability), distinguished between age groups (64-73 and 74-90+ years) and cognitive status groups (nonimpaired, mildly impaired, and moderately impaired). Study 1 (n = 416) showed that both level and inconsistency distinguished between the age and 2 cognitive status (not impaired, mildly impaired) groups, with a modest tendency for inconsistency to predict group membership over and above mean level. Study 2 (n = 304) replicated these results but extended them because of the qualifying effects associated with the unique moderately impaired oldest group. Specifically, not only were the groups more firmly distinguished by both indicators of speed, but evidence for the differential contribution of performance inconsistency was stronger. Neurocognitive markers of speed and inconsistency may be leading indicators of emerging cognitive impairment.

Neurocognitive markers of cognitive impairment: exploring the roles of speed and inconsistency. Publishing Authors By Initials

RA Dixon,DD Garrett,TL Lentz,SW MacDonald,E Strauss,DF Hultsch,

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Neurocognitive markers of cognitive impairment: exploring the roles of speed and inconsistency. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Neuropsychology

VOLUME: 21

Page Numbers: 381-99

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ISSN: 0894-4105

DAY: 3

MONTH: May

YEAR: 2007

Neurocognitive markers of cognitive impairment: exploring the roles of speed and inconsistency. Information

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LANGUAGE: eng

NlmUniqueID: 8904467

Neurocognitive markers of cognitive impairment: exploring the roles of speed and inconsistency. Keywords Mesh Terms:

KEYWORDS: Vocabulary

MESH TERMS: physiology

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Grant and Affiliation Information for Neurocognitive markers of cognitive impairment: exploring the roles of speed and inconsistency.

AFFILIATION: Department of Psychology, University of Alberta, Edmonton, Alberta, Canada. rdixon@ualberta.ca

Country: United States

AGENCY: United States NIA

GRANT: R37 AG08235

ACRONYM: AG

MEDLINETA: Neuropsychology

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