A Study of Developmental Speech and Language Disorders in Twins 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 ... Research Article
Research Article  |   October 01, 1992
A Study of Developmental Speech and Language Disorders in Twins
 
Author Affiliations & Notes
  • Barbara A. Lewis
    Department of Pediatrics Case Western Reserve University Cleveland, OH
  • Lee A. Thompson
    Department of Psychology Case Western Reserve University Cleveland, OH
  • Contact author: Barbara A. Lewis, PhD, Department of Pediatrics, Rainbow Babies and Children’s Hospital, 2101 Adalbert Road, Cleveland, OH 44106.
Article Information
Speech, Voice & Prosodic Disorders / Language Disorders / Language / Research Articles
Research Article   |   October 01, 1992
A Study of Developmental Speech and Language Disorders in Twins
Journal of Speech, Language, and Hearing Research, October 1992, Vol. 35, 1086-1094. doi:10.1044/jshr.3505.1086
History: Received August 8, 1991 , Accepted January 24, 1992
 
Journal of Speech, Language, and Hearing Research, October 1992, Vol. 35, 1086-1094. doi:10.1044/jshr.3505.1086
History: Received August 8, 1991; Accepted January 24, 1992

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.

Acknowledgments
This work was supported in part by NICHD Grant HD-21947 and MH-46512. We are grateful to the Western Reserve Twin Project and Douglaus K. Detterman for generously sharing their subjects and data with us.
We also wish to thank Lisa Freebaim-Tarr for her assistance in this project and the parents of the twins who took the time to respond to our questionnaire.
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