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Direct linkDavis, Oliver S. P.; Arden, Rosalind; Plomin, Robert – Intelligence, 2008
A 2003 paper in this journal reported results from a large sample of twins assessed at 2, 3 and 4 years of age on parent-administered tests and reports of their verbal and nonverbal ability. We found clear evidence for phenotypic general cognitive ability (g) that accounted for about 50% of the variance, for modest genetic influence on g (about…
Descriptors: Twins, Toddlers, Children, Measurement Techniques
Peer reviewedPlomin, Robert; Foch, Terryl T. – Child Development, 1981
Sex differences and their relationship to individual differences were examined for Maccoby and Jacklin's sex differences summaries, for a diverse set of measures of specific cognitive abilities (including verbal ability), and for objective personality assessments of 216 school-age children. Average differences between groups appeared to be trivial…
Descriptors: Children, Cognitive Ability, Elementary Secondary Education, Individual Differences
Harlaar, Nicole; Butcher, Lee M.; Meaburn, Emma; Sham, Pak; Craig, Ian W.; Plomin, Robert – Journal of Child Psychology and Psychiatry, 2005
Background: Five DNA markers (single-nucleotide polymorphisms, SNPs) have recently been found to be associated with general cognitive ability "g") in a sample of 7414 7-year-old twins. These children have also been studied at 2, 3, 4, and 7 years of age on measures of cognitive and language development and behaviour problems; family environment…
Descriptors: Discipline, Effect Size, Family Environment, Nonverbal Ability
