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| Research article summary (published 30 Dec 2001): |
Comparative longitudinal structural analyses of the growth and decline of multiple intellectual abilities over the life span.
Full Abstract
Latent growth curve techniques and longitudinal data are used to examine predictions from the theory of fluid and crystallized intelligence (Gf-Gc theory; J. L. Horn & R. B. Cattell, 1966, 1967). The data examined are from a sample (N approximately 1,200) measured on the Woodcock-Johnson Psycho-Educational Battery-Revised (WJ-R). The longitudinal structural equation models used are based on latent growth models of age using two-occasion "accelerated" data (e.g., J. J. McArdle & R. Q. Bell, 2000; J. J. McArdle & R. W. Woodcock, 1997). Nonlinear mixed-effects growth models based on a dual exponential rate yield a reasonable fit to all life span cognitive data. These results suggest that most broad cognitive functions fit a generalized curve that rises and falls. Novel multilevel models directly comparing growth curves show that broad fluid reasoning (Gf) and acculturated crystallized knowledge (Gc) have different growth patterns. In all comparisons, any model of cognitive age changes with only a single g factor yields an overly simplistic view of growth and change over age.
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Author information
Author/s: McArdle, John J (JJ); Ferrer-Caja, Emilio (E); Hamagami, Fumiaki (F); Woodcock, Richard W (RW);
Affiliation: Department of Psychology, University of Virginia, Charlottesville 22904-4400, USA. jjm(-atsign-)virginia.edu
Grants: AG02695 (Agency:United States NIA) ; AG04704 (Agency:United States NIA) ; AG07137 (Agency:United States NIA)
Journal and publication information
Publication Type: Journal Article; Research Support, U.S. Gov't, P.H.S.
Journal: Developmental psychology (Dev Psychol), published in United States. (Language: eng)
Reference: 2002-Jan; vol 38 (issue 1) : pp 115-42
Dates: Created 2002/01/24; Completed 2002/06/26; Revised 2007/11/14;
PMID: 11806695, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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