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g in Middle Childhood: Moderate Genetic and Shared Environmental Influence Using Diverse Measures of General Cognitive Ability at 7, 9 and 10 Years in a Large Population Sample of Twins
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Davis, 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
Testing Specific Cognitive Abilities by Telephone and Mail.
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Kent, Jaylene; Plomin, Robert – Intelligence, 1987
A telephone test battery to assess verbal, spatial, and memory ability and perceptual speed in adolescents was developed. Test materials were mailed to 212 adolescents (members of 54 adoptive and 52 nonadoptive sibling pairs). Results show that telephone testing can be satisfactorily used to assess specific cognitive abilities with less anxiety…
Descriptors: Adolescents, Cognitive Ability, Perception, Spatial Ability
Environmental Moderators of Genetic Influence on Verbal and Nonverbal Abilities in Early Childhood
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Asbury, Kathryn; Wachs, Theodore D.; Plomin, Robert – Intelligence, 2005
The study of genotype-environment interaction (G x E) has been dominated by two competing hypotheses, one that heritability is greater in high-risk environments (diathesis-stress) and the other that heritability is greater in permissive environments. The current study examined relationships between verbal and nonverbal abilities and 10 measured…
Descriptors: Nonverbal Ability, Young Children, Verbal Ability, Genetics