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Peer reviewedRushton, J. Philippe; Osborne, R. Travis – Intelligence, 1995
Data from 236 pairs of black twins and white twins aged 13-17 years were used to examine genetic and environmental factors influencing cranial size, an indirect estimate of brain volume. Genetic factors are required to account for the phenotypic variance in cranial capacity. (SLD)
Descriptors: Adolescents, Biological Influences, Blacks, Environmental Influences
Peer reviewedBishop, E. G.; Cherny, Stacey S.; Corley, Robin; Plomin, Robert; DeFries, John C.; Hewitt, John K. – Intelligence, 2003
Studied continuity and change in general cognitive ability from infancy to adolescence in adoptees (107 children), biological siblings (87 pairs), and twins (224 monozygotic and 189 dyzygotic pairs). Findings generally support previous findings about genetic and environmental factors, with the exception that in the transition to adolescence,…
Descriptors: Adolescents, Adopted Children, Change, Cognitive Ability
