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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 reviewedLight, Jacquelyn Gillis; DeFries, John C. – Journal of Learning Disabilities, 1995
Data from 148 identical and 111 fraternal twin pairs in which at least 1 member had a reading disability were statistically analyzed. Results suggest that genetic and shared-environment influences both contribute to the observed covariance between reading and mathematical deficits. (Author/DB)
Descriptors: Etiology, Family Environment, Genetics, Learning Disabilities
