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Direct linkDeThorne, Laura S.; Petrill, Stephen A.; Hayiou-Thomas, Marianna E.; Plomin, Robert – Journal of Speech, Language, and Hearing Research, 2005
This study of 4,274 pairs of 4-year-old twins from the Twins Early Development Study explored the magnitude of genetic and environmental effects on low expressive vocabulary skill, both as a function of general cognitive ability and as a function of the severity of expressive vocabulary impairment. Assessments were conducted through parent report…
Descriptors: Severity (of Disability), Vocabulary Skills, Cognitive Ability, Twins
