Heritability of Specific Language Impairment and Nonspecific Language Impairment at Ages 4 and 6 Years across Phenotypes of Speech, Language, and Nonverbal Cognition

Purpose: Early language and speech acquisition can be delayed in twin children, a twinning effect that diminishes between 4 and 6 years of age in a population-based sample. The purposes of this study were to examine how twinning effects influence the identification of children with language impairme...

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