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Endophenotypes for Intelligence in Children and Adolescents
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van Leeuwen, Marieke; van den Berg, Stephanie M.; Hoekstra, Rosa A.; Boomsma, Dorret I. – Intelligence, 2007
The aim of this study was to identify promising endophenotypes for intelligence in children and adolescents for future genetic studies in cognitive development. Based on the available set of endophenotypes for intelligence in adults, cognitive tasks were chosen covering the domains of working memory, processing speed, and selective attention. This…
Descriptors: Memory, Adolescents, Reaction Time, Intelligence
The Phenotypic and Genotypic Relation between Working Memory Speed and Capacity
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Polderman, 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
Inspection Time and Intelligence: A Meta-Analysis.
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Kranzler, John H.; Jensen, Arthur R. – Intelligence, 1989
A meta-analysis of research on the relationship between inspection time (IT) and IQ was performed. The analysis was designed to determine whether a non-zero relationship between IT and IQ exists, estimate the size of this relationship, and test whether IT is ontogenetically related to "g" (intelligence). (TJH)
Descriptors: Adults, Age Differences, Child Development, Children