Genetic covariance among measures of information processing speed, working memory, and IQ

Luciano, M., Wright, M. J., Smith, G. A., Geffen, G. M., Geffen, L. B. and Martin, N. G. (2001) Genetic covariance among measures of information processing speed, working memory, and IQ. Behavior Genetics, 31 6: 581-592. doi:10.1023/A:1013397428612

Author Luciano, M.
Wright, M. J.
Smith, G. A.
Geffen, G. M.
Geffen, L. B.
Martin, N. G.
Title Genetic covariance among measures of information processing speed, working memory, and IQ
Journal name Behavior Genetics   Check publisher's open access policy
ISSN 0001-8244
Publication date 2001-11
Sub-type Article (original research)
DOI 10.1023/A:1013397428612
Volume 31
Issue 6
Start page 581
End page 592
Total pages 12
Place of publication Westport, USA
Publisher Greenwood Peridicals
Collection year 2001
Language eng
Subject C1
321011 Medical Genetics
730306 Evaluation of health outcomes
Abstract The genetic relationship between lower (information processing speed), intermediate (working memory), and higher levels (complex cognitive processes as indexed by IQ) of mental ability was studied in a classical twin design comprising 166 monozygotic and 190 dizygotic twin pairs. Processing speed was measured by a choice reaction time (RT) task (2-, 4-, and 8-choice), working memory by a visual-spatial delayed response task, and IQ by the Multidimensional Aptitude Battery. Multivariate analysis, adjusted for test-retest reliability, showed the presence of a genetic factor influencing all variables and a genetic factor influencing 4- and 8-choice RTs, working memory, and IQ. There were also genetic factors specific to 8-choice RT, working memory, and IQ. The results confirmed a strong relationship between choice RT and IQ (phenotypic correlations: -0.31 to -0.53 in females, -0.32 to -0.56 in males; genotypic correlations: -0.45 to -0.70) and a weaker but significant association between working memory and IQ (phenotypic: 0.26 in females, 0.13 in males; genotypic: 0.34). A significant part of the genetic variance (43%) in IQ was not related to either choice RT or delayed response performance, and may represent higher order cognitive processes.
Keyword Behavioral Sciences
Genetics & Heredity
Psychology, Multidisciplinary
Processing Speed
Working Memory
Multivariate Analysis
General Genetic Factor
Reserve Twin Project
Choice Reaction-time
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Medicine Publications
School of Psychology Publications
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Created: Tue, 14 Aug 2007, 15:25:56 EST