Article
Genetic and environmental mediation of the relationship between language and nonverbal impairment in 4-year-old twins.
Journal of speech, language, and hearing research : JSLHR - 1 Dec 2003
Viding Essi, Price Thomas S, Spinath Frank M, Bishop Dorothy V M, Dale Philip S, Plomin Robert
Abstract excerpt
This study of 4-year-old twins investigated the genetic and environmental origins of comorbidity between language impairment and nonverbal ability by testing the extent to which language impairment in one twin predicted nonverbal ability in the co-twin. Impairment of language ability was defined as scores below the 15th percentile on a general language scale derived from a battery of diverse language tests. Four...
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