Cognitive performance inconsistency: Intraindividual change and variability

Nilam Ram, Brian Stollery, Patrick Rabbitt, John R. Nesselroade

Research output: Contribution to journalArticle

71 Citations (Scopus)

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 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 f scores compared to individuals with higher scores.

Original languageEnglish (US)
Pages (from-to)623-633
Number of pages11
JournalPsychology and aging
Volume20
Issue number4
DOIs
StatePublished - Dec 1 2005

Fingerprint

Intelligence
Aptitude
Practice (Psychology)
Recognition (Psychology)

All Science Journal Classification (ASJC) codes

  • Social Psychology
  • Aging
  • Geriatrics and Gerontology

Cite this

Ram, Nilam ; Stollery, Brian ; Rabbitt, Patrick ; Nesselroade, John R. / Cognitive performance inconsistency : Intraindividual change and variability. In: Psychology and aging. 2005 ; Vol. 20, No. 4. pp. 623-633.
@article{f2deedffe1084e4f97a8271c27ac0b1a,
title = "Cognitive performance inconsistency: Intraindividual change and variability",
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 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 f scores compared to individuals with higher scores.",
author = "Nilam Ram and Brian Stollery and Patrick Rabbitt and Nesselroade, {John R.}",
year = "2005",
month = "12",
day = "1",
doi = "10.1037/0882-7974.20.4.623",
language = "English (US)",
volume = "20",
pages = "623--633",
journal = "Psychology and Aging",
issn = "0882-7974",
publisher = "American Psychological Association Inc.",
number = "4",

}

Cognitive performance inconsistency : Intraindividual change and variability. / Ram, Nilam; Stollery, Brian; Rabbitt, Patrick; Nesselroade, John R.

In: Psychology and aging, Vol. 20, No. 4, 01.12.2005, p. 623-633.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Cognitive performance inconsistency

T2 - Intraindividual change and variability

AU - Ram, Nilam

AU - Stollery, Brian

AU - Rabbitt, Patrick

AU - Nesselroade, John R.

PY - 2005/12/1

Y1 - 2005/12/1

N2 - 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 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 f scores compared to individuals with higher scores.

AB - 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 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 f scores compared to individuals with higher scores.

UR - http://www.scopus.com/inward/record.url?scp=31044432336&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=31044432336&partnerID=8YFLogxK

U2 - 10.1037/0882-7974.20.4.623

DO - 10.1037/0882-7974.20.4.623

M3 - Article

C2 - 16420137

AN - SCOPUS:31044432336

VL - 20

SP - 623

EP - 633

JO - Psychology and Aging

JF - Psychology and Aging

SN - 0882-7974

IS - 4

ER -