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A Twin Study of Mathematics Disability.
Peer reviewed Peer reviewed
Alarcon, 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
Comorbidity of Reading and Mathematics Disabilities: Genetic and Environmental Etiologies.
Peer reviewed Peer reviewed
Light, 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
Specific Deficits in Component Reading and Language Skills: Genetic and Environmental Influences.
Peer reviewed Peer reviewed
Olson, Richard; And Others – Journal of Learning Disabilities, 1989
Word recognition data from identical and fraternal twins and siblings (N=172) indicated that the phonological coding deficit of children with reading disabilities was highly heritable. Orthographic coding was not significantly heritable. Poor readers with low IQs were superior to similar reading but average IQ readers in phonological coding.…
Descriptors: Elementary Secondary Education, Genetics, Heredity, Intelligence Differences