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Direct linkCoventry, William; Anton-Mendez, Ines; Ellis, Elizabeth M.; Levisen, Christina; Byrne, Brian; van Daal, Victor H. P.; Ellis, Nick C. – Language Learning, 2012
We present one of the first behavior-genetic studies of individual differences in school students' levels of achievement in instructed second language acquisition (ISLA). We assessed these language abilities in Australian twin pairs (maximum N pairs = 251) by means of teacher ratings, class rankings, and self-ratings of proficiency, and used the…
Descriptors: Twins, Second Language Learning, Genetics, Etiology
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
