Causal Pathways for Specific Language Impairment: Lessons From Studies of Twins.

WHAT IT FOUND

Twin studies show that language ability is strongly influenced by genetics, with heritability increasing from age 2 to 16.

Being a twin causes early language delays that often resolve by age 6, but this twinning effect does not affect nonverbal IQ.

What this paper is

This is a review article summarizing decades of twin research on the genetic and environmental causes of Specific Language Impairment (SLI). It discusses historical theories and aggregates findings from other studies rather than reporting new, original methods or results from a single trial. Consequently, there are no new clinical outcomes or protocols here to change your practice on.

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