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Direct linkJohnson, Wendy; Bouchard, Thomas J.; McGue, Matt; Segal, Nancy L.; Tellegen, Auke; Keyes, Margaret; Gottesman, Irving I. – Intelligence, 2007
In previous papers [Johnson, W., & Bouchard Jr., T. J. (2005a). Constructive Replication of the Visual-Perceptual-Image Rotation (VPR) Model in Thurstone's (1941) Battery of 60 Tests of Mental Ability. Intelligence, 33, 417-430.] [Johnson, W., & Bouchard Jr., T. J. (2005b). The Structure of Human Intelligence: It's Verbal, perceptual, and image…
Descriptors: Intelligence, Twins, Genetics, Environmental Influences
Bates, Timothy C.; Luciano, Michelle; Lind, Penelope A.; Wright, Margaret J.; Montgomery, Grant W.; Martin, Nicholas G. – Intelligence, 2008
Derived changes in genes associated with primary microcephaly (MCPH) have been suggested to be "currently sweeping to fixation" i.e., increasing in frequency in most populations, with the likely outcome that the derived allele will completely displace the ancestral allele over time. Possible causes for this sweep include effects on human reasoning…
Descriptors: Dyslexia, Language Impairments, Short Term Memory, Brain
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
Johnson, Wendy; Bouchard, Thomas J., Jr. – Intelligence, 2007
Empirical data suggest that there is at most a very small sex difference in general mental ability, but men clearly perform better on visuospatial tasks while women clearly perform better on tests of verbal usage and perceptual speed. In this study, we integrated these overall findings with predictions based on the Verbal-Perceptual-Rotation (VPR)…
Descriptors: Gender Differences, Cognitive Ability, Visual Perception, Verbal Ability
Peer reviewedWadsworth, Sally J.; And Others – Intelligence, 1995
The genetic and environmental causes of the phenotypic association between reading and verbal short-term memory (VSTM) were analyzed using data from the Colorado Reading Project for 446 twin pairs. Results of bivariate behavioral genetic analyses indicate that both reading ability and VSTM are highly heritable. (SLD)
Descriptors: Causal Models, Environmental Influences, Genetics, Reading Achievement
Peer reviewedJensen, Arthur R. – Intelligence, 1998
Discusses work by Arthur Jensen in addition to his well-known work on the genetics of intelligence. Includes studies of learning, memory, the cumulative-deficit hypothesis, Spearman's hypothesis, and the speed of information processing. (SLD)
Descriptors: Cognitive Processes, Genetics, Intelligence, Learning
Peer reviewedRushton, J. Philippe – Intelligence, 1998
Comments on the work of Arthur Jensen, specifically "The g Factor" (1998), which consolidates the psychometric, neurophysiological, behavior genetic, and comparative evidence for the existence and importance of a factor of general intelligence ("g"). Discusses Jensen's work on black/white differences in intelligence. (SLD)
Descriptors: Blacks, Cognitive Processes, Genetics, Intelligence
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
Singer, Jamie J.; MacGregor, Alex J.; Cherkas, Lynn F.; Spector, Tim D. – Intelligence, 2006
The genetic relationship between intelligence and components of cognition remains controversial. Conflicting results may be a function of the limited number of methods used in experimental evaluation. The current study is the first to use CANTAB (The Cambridge Neuropsychological Test Automated Battery). This is a battery of validated computerised…
Descriptors: Memory, Intelligence Tests, Genetics, Neuropsychology
Peer reviewedCardon, Lon R.; And Others – Intelligence, 1992
A multivariate hierarchical model of specific cognitive abilities was fitted to data from 196 adopted and 213 nonadopted children from the Colorado Adoption Project and 120 of their siblings to assess genetic influence on specific mental abilities. Genetic effects occur in middle childhood that differentially influence mental ability scores.…
Descriptors: Adopted Children, Cognitive Ability, Elementary Education, Elementary School Students
