The Genetic and Environmental Origins of Language Disability and Ability.

• Autores: Frank M. Spinath, Thomas S. Price, Philip S. Dale, Robert Plomin
• Localización: Child development, ISSN 0009-3920, Vol. 75, Nº. 2, 2004, págs. 445-454
• Idioma: inglés
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• Resumen

  • This study investigated whether genes affect language impairment to the same extent as they affect differences in language ability following up an earlier study of 579 four-year-old twins with low language performance and their cotwins ( ). The present study selected low-language twins from 6,963 pairs of twins from the Twins Early Development Study assessed for vocabulary and grammar by their parents at 2, 3, and 4 years of age. For impaired groups corresponding to the lowest scoring 5% and 10% at each age, twin concordances and model-fitting analyses indicated substantial genetic influence on the mean difference between affected children and the population ( h2 g), generally higher than for individual differences for the entire sample ( h2). [ABSTRACT FROM AUTHOR]