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Comorbidity between Reading Disability and Math Disability: Concurrent Psychopathology, Functional Impairment, and Neuropsychological Functioning

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Willcutt, Erik G.; Petrill, Stephen A.; Wu, Sarah; Boada, Richard; DeFries, John C.; Olson, Richard K.; Pennington, Bruce F. – Journal of Learning Disabilities, 2013

Reading disability (RD) and math disability (MD) frequently co-occur, but the etiology of this comorbidity is not well understood. Groups with RD only (N = 241), MD only (N = 183), and RD + MD (N = 188) and a control group with neither disorder (N = 411) completed a battery of measures of internalizing and externalizing psychopathology, social and…

Descriptors: Comorbidity, Reading Difficulties, Behavior Disorders, Psychopathology

A Twin Study of Mathematics Disability.

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

Covariation of Mathematics Achievement and General Cognitive Ability in Twins.

Peer reviewed

Alarcon, Maricela; Knopik, Valerie S.; DeFries, John C. – Journal of School Psychology, 2000

Assesses the etiology of the covariation between mathematics performance and general cognitive ability in data from a sample of 555 twins selected for learning deficits and from a sample of 570 control twins pairs. Results show that the phenotypic relationship between mathematics and general cognitive ability is due primarily to genetic…

Descriptors: Analysis of Covariance, Genetics, Intellectual Development, Intelligence Quotient