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Peer reviewedAlarcon, Marciela; DeFries, John C.; Light, Jacquelyn Gillis; Pennington, Bruce F. – Journal of Learning Disabilities, 1997
Comparison of twins (40 identical and 23 fraternal) for mathematics deficits (MD), in which at least one member had a mathematics disability, found evidence for a significant genetic etiology. However, tests for the differential etiology of MD as a function of reading performance level were nonsignificant. (Author/DB)
Descriptors: Etiology, Genetics, Heredity, Incidence
Peer reviewedBoada, Richard; Willcutt, Erik G.; Tunick, Rachel A.; Chhabildas, Nomita A.; Olson, Richard K.; DeFries, John C.; Pennington, Bruce F. – Reading and Writing: An Interdisciplinary Journal, 2002
Examines the etiology of high reading ability in twin pairs. Suggests that reading ability and its cognitive correlates are on a continuous distribution, with both extremes of the distribution being similarly heritable. Supports the hypothesis that the same cognitive processes that are associated with dyslexia are important for the development of…
Descriptors: Cognitive Processes, Dyslexia, Elementary Education, Etiology
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
