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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
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
