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Journal of Speech and Hearing Disorders Vol.55 160-170 February 1990.
© American Speech-Language-Hearing Association
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Familial Phonological Disorders

Four Pedigrees

Barbara A. Lewis 1

1 Department of Pediatrics Case Western Reserve University Cleveland, OH

The pedigrees of 4 children with a severe phonological disorder demonstrating three generations of members with speech/language problems are presented. All 4 probands were female with two mothers, two fathers, and five out of six siblings affected. All pedigrees contained family members with dyslexia and learning disabilities as well as speech disorders. Family members varied in the type of speech problems that they demonstrated and the severity of their disorder, thus suggesting variable expressivity and incomplete penetrance. An autosomal dominant mode, a multifactorial-polygenic model, and a sex-specific threshold model for expression are discussed.

Key Words: phonological disorders • familial • pedigrees • articulation disorders

Submitted on February 27, 1989
Accepted on June 16, 1989




This article has been cited by other articles:


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 J Learn DisabilHome page
B. A. Lewis
Pedigree Analysis of Children with Phonology Disorders
J Learn Disabil, November 1, 1992; 25(9): 586 - 597.
[Abstract] [PDF]


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