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- Title
Genetic Covariance Among Measures of Information Processing Speed, Working Memory, and IQ.
- Authors
Luciano, M.; Wright, M.J.; Smith, G.A.; Geffen, G.M.; Geffen, L.B.; Martin, N.G.
- 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.
- Subjects
INFORMATION processing; SHORT-term memory; INTELLIGENCE levels; GENETICS
- Publication
Behavior Genetics, 2001, Vol 31, Issue 6, p581
- ISSN
0001-8244
- Publication type
Article
- DOI
10.1023/A:1013397428612