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Harlaar, Nicole; Hayiou-Thomas, Marianna E.; Dale, Philip S.; Plomin, Robert – Journal of Speech, Language, and Hearing Research, 2008
Purpose: Language acquisition is predictive of successful reading development, but the nature of this link is poorly understood. Method: A sample of 7,179 twin pairs was assessed on parent-report measures of syntax and vocabulary at ages 2, 3, and 4 years and on teacher assessments of reading achievement (RA) at ages 7, 9, and 10 years. These…
Descriptors: Language Acquisition, Twins, Reading Achievement, Language Aptitude
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Kovas, Yulia; Hayiou-Thomas, Marianna E.; Oliver, Bonamy; Dale, Philip S.; Bishop, Dorothy V. M.; Plomin, Robert – Child Development, 2005
The genetic and environmental etiologies of diverse aspects of language ability and disability, including articulation, phonology, grammar, vocabulary, and verbal memory, were investigated in a U.K. sample of 787 pairs of 4.5-year-old same-sex and opposite-sex twins. Moderate genetic influence was found for all aspects of language in the normal…
Descriptors: Phonology, Language Skills, Environmental Influences, Etiology