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Direct linkKirkpatrick, Robert M.; Legrand, Lisa N.; Iacono, William G.; McGue, Matt – Learning and Individual Differences, 2011
Existing behavior-genetic research implicates substantial influence of heredity and modest influence of shared environment on reading achievement and reading disability. Applying DeFries-Fulker analysis to a combined sample of twins and adoptees (N = 4886, including 266 reading-disabled probands), the present study replicates prior findings of…
Descriptors: Reading Achievement, Reading Difficulties, Twins, Adoption
van Leeuwen, Marieke; van den Berg, Stephanie M.; Boomsma, Dorret I. – Learning and Individual Differences, 2008
In this paper we assess the presence of assortative mating, gene-environment interaction and the heritability of intelligence in childhood using a twin family design with twins, their siblings and parents from 112 families. We evaluate two competing hypotheses about the cause of assortative mating in intelligence: social homogamy and phenotypic…
Descriptors: Intelligence, Twins, Intelligence Quotient, Genetics
