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Direct linkPetrill, Stephen A.; Lipton, Paul A.; Hewitt, John K.; Plomin, Robert; Cherny, Stacey S.; Corley, Robin; DeFries, John C. – Developmental Psychology, 2004
The genetic and environmental contributions to the development of general cognitive ability throughout the first 16 years of life were examined using sibling data from the Colorado Adoption Project. Correlations were analyzed along with structural equation models to characterize the genetic and environmental influences on longitudinal stability…
Descriptors: Environmental Influences, Cognitive Ability, Genetics, Nature Nurture Controversy
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
Peer reviewedO'Connor, Thomas G.; Caspi, Avshalom; DeFries, John C.; Plomin, Robert – Developmental Psychology, 2000
Data from Colorado Adoption Project were used to examine hypothesis that association between parental divorce and children's adjustment is mediated by genetic factors. Findings for psychopathology were consistent with an environmentally mediated explanation for the association. Findings for achievement and social adjustment were consistent with a…
Descriptors: Academic Achievement, Adopted Children, Behavior Problems, Children
