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Peer reviewedLoxova, Renata; And Others – Journal of Mental Deficiency Research, 1973
Descriptors: Etiology, Exceptional Child Research, Genetics, Incidence
Johnson, Ronald C.; Abelson, Robert B. – Amer J Ment Deficiency, 1969
Descriptors: Behavior Problems, Comparative Analysis, Downs Syndrome, Etiology
Download full textSiegenthaler, Bruce M. – 1970
Tests were administered to 209 educable mentally handicapped children (mean age 10.8, mean IQ 77) to determine factors related to speech hearing. Results indicated that mental age, intelligence quotient, physiological age, institutionalization, and organic bases for retardation were not significantly related either to speech reception threshold or…
Descriptors: Age Differences, Auditory Discrimination, Auditory Perception, Etiology
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
Peer reviewedWadsworth, Sally J.; Olson, Richard K.; Pennington, Bruce F.; DeFries, John C. – Journal of Learning Disabilities, 2000
Composite reading performance data from 223 pairs of identical twins and 169 same-gender fraternal twins in which at least one member was classified with reading disability were subjected to multiple regression analysis. Results indicated that the genetic etiology of reading disability differs as a linear function of IQ. (Contains extensive…
Descriptors: Biological Influences, Children, Disability Identification, Environmental Influences
Rowe, David C.; And Others – Advances in Applied Developmental Psychology, 1996
The research described in this article addressed the question of why siblings commonly have different developmental outcomes despite their common beginnings. The studies analyzed behavioral development, especially through examination of deviant behaviors and intellectual development, by tracing siblings' different life histories. The work is based…
Descriptors: Adolescents, Adult Development, Context Effect, Delinquency
