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Direct linkPolderman, Tinca J. C.; Stins, John F.; Posthuma, Danielle; Gosso, M. Florencia; Verhulst, Frank C.; Boomsma, Dorret I. – Intelligence, 2006
This study examined the phenotypic and genotypic relationship between working memory speed (WMS) and working memory capacity (WMC) in 12-year-old twins and their siblings (N = 409). To asses WMS all children performed a reaction time task with three memory loads from which a basic mental speed measure and the derived slope were used. WMC was…
Descriptors: Short Term Memory, Children, Twins, Siblings
Peer reviewedKnopik, Valerie S.; Defries, John C. – Intelligence, 1998
To study whether individual differences in general cognitive ability differ in males and females, full-scale IQ data from 426 child twin pairs were fitted to a structural equation model of sex limitation. Individual differences in general cognitive ability appear to be substantially due to common genetic influences in males and females. (SLD)
Descriptors: Biological Influences, Cognitive Ability, Genetics, Individual Differences
Peer reviewedCardon, Lon R.; Fulker, David W. – Intelligence, 1991
Sources of continuity among nine measures of infant cognitive processing and later childhood intelligence quotient were examined through developmental structural equation models applied to a sample of 208 twin pairs measured from 7 to 36 months. Skills assessed appear related to general cognitive ability in a relatively unstable manner. (SLD)
Descriptors: Child Development, Cognitive Ability, Cognitive Processes, Cognitive Tests
