PMID 11838535
Main Page | Search | Input | View Record | Links | FAQ |
---|
- Title
Genetic covariance among measures of information processing speed, working memory, and IQ.
- Authors
Luciano M, Wright M, Smith GA, Geffen GM, Geffen LB, Martin NG
- Year
2001
- 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.
- Keywords
Adolescent, Cerebral Cortex, Female, Humans, Intelligence, Male, Memory, Short-Term, Models, Genetic, Multivariate Analysis, Phenotype, Reaction Time, Twins
- Reference
- Input Author
- Notes
- Closely related pages (vote or nominate related pages)
- Links out:
- Google 11838535
- Wikipedia 11838535
- PubBrain
- PMID 11838535
- -coming soon...ucla cognitive atlas-
- Database links