1992•Journal of Speech Language and Hearing ResearchRequires access

A Study of Developmental Speech and Language Disorders in Twins

Barbara Lewis, Lee A. Thompson

Abstract

Fifty-seven same-sex twin sets (32 monozygotic and 25 dizygotic) were examined for concordance of speech and language disorders. Results showed monozygotic twins to have higher concordance than dizygotic twins. In addition, monozygotic twins were more similar in the types of disorders they presented than dizygotic twins. Positive family histories for speech, language, and learning disorders were reported in the nuclear families of the twins.

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Key concepts: Concordance, Dizygotic twins, Dizygotic twin, Monozygotic twin, Psychology, Developmental psychology, Language development, Audiology