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Author (up) Ram, N.; Rabbitt, P.; Stollery, B.; Nesselroade, J.R. url  openurl
  Title Cognitive Performance Inconsistency: Intraindividual Change and Variability Type Journal Article
  Year 2005 Publication Psychology and Aging Abbreviated Journal  
  Volume 20 Issue 4 Pages 623-633  
  Keywords cognitive performance inconsistency; intraindividual change; intraindividual validity; memory speed; aging; multivariate; growth curves; nonlinear; Cognitive Ability; Individual Differences; Memory  
  Abstract Although many studies have examined inconsistency of cognitive performance, few have examined how inconsistency changes over time. 91 older adults (age 52 to 79) were tested weekly for 36 consecutive weeks on a series of multitrial memory speed (i.e., letter recognition) tasks. A number of multivariate techniques were used to examine how individuals' level of inconsistency changed across weeks and how this change was related to interindividual differences in age and intelligence. Results indicated that (a) inconsistency of performance is a construct separate from the underlying performance ability (i.e., memory speed); (b) inconsistency reduces exponentially with practice; (c) individuals with higher scores on tests of fluid general intelligence (G-sub(f)) reached lower asymptotic levels of inconsistency compared to lower scorers; and (d) after controlling for the systematic effects of practice, variability in inconsistency from week-to-week was more pronounced for individuals with lower G-sub(f) scores compared to individuals with higher scores. (PsycINFO Database Record (c) 2007 APA, all rights reserved) (from the journal abstract)  
  Corporate Author Thesis  
  Publisher American Psychological Association Place of Publication Ram, Nilam, Department of Psychology, University of Virginia, P.O. Box 400400, Charlottesville, VA, Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes 0882-7974Accession Number: 2006-00628-009. First Author & Affiliation: Ram, Nilam; Department of Psychology, University of Virginia, Charlottesville, VA, US. Other Journal Title: Psychology and Aging. Release Date: 20060117. Publication Type: Journal (0100) Peer Reviewed Journal (0110). Media Covered: Electronic. Media Available: Electronic; Print. Document Type: Journal Article. Language: English. Major Descriptor: Aging; Cognitive Ability; Individual Differences; Memory. Classification: Gerontology (2860) Cognitive Processes (2340) . Population: Human (10) Male (30) Female (40) . Location: US. Age Group: Adulthood (18 yrs & older) (300) Middle Age (40-64 yrs) (360) Aged (65 yrs & older) (380) . Tests & Measures: AH4-1 Intelligence Test; . Methodology: Empirical Study; Longitudinal Study; Quantitative Study. References Available: Y. Approved no  
  Call Number refbase @ user @ Ram2005 Serial 4961  
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