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Journal of Learning…

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Pennington, Bruce F.	1
Siegenthaler, Bruce M.	1

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Siegenthaler, 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

The External Validity of Age-versus IQ-Discrepancy Definitions of Reading Disability: Lessons from a Twin Study.

Peer reviewed

Pennington, 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