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Direct linkAstrom, Raven L.; Wadsworth, Sally J.; Olson, Richard K.; Willcutt, Erik G.; DeFries, John C. – Learning and Individual Differences, 2012
Reading performance data from 254 pairs of identical (MZ) and 420 pairs of fraternal (DZ) twins, 8.0 to 20.0 years of age, were subjected to multiple regression analyses. An extension of the DeFries-Fulker (DF) analysis (DeFries & Fulker, 1985, 1988) that facilitated inclusion of data from 303 of their nontwin siblings was employed. In addition to…
Descriptors: Reading Difficulties, Twins, Genetics, Environmental Influences
Kirkpatrick, 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
