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Peer reviewedDeFries, J. C. – Journal of Learning Disabilities, 1989
A study applied the polygenic threshold model to previously reported differences in gender ratios among children with reading disabilities and close family members with similar disabilities. The results were found to be predictable with the model. (MSE)
Descriptors: Elementary Secondary Education, Heredity, Models, Parents
Peer reviewedPennington, Bruce F.; And Others – Journal of Learning Disabilities, 1992
This study of 640 twins with reading disability and 436 controls (mean age 12) examined external validity of the distinction between specific reading retardation and reading backwardness, in 3 domains: genetic etiology, sex ratio and clinical correlates, and neuropsychological profiles. There was no evidence of differential genetic etiology of the…
Descriptors: Age Differences, Definitions, Educational Diagnosis, Elementary Secondary Education
