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Article

Longitudinal Study of Language of Twins at Ages 9 and 14 Years: Twinning, Zygosity, and Heritability.

Journal of speech, language, and hearing research : JSLHR - 10 Jun 2026

Rice Mabel L, Zubrick Stephen R, Earnest Kathleen Kelsey, Hoffman Lesa

Abstract excerpt

PURPOSE: This unprecedented longitudinal twin study focused on the arc of language acquisition from first words to adolescence, with data collection at 2, 4, and 6 years of age, reported in four previous studies and now new data at ages 9 and 14 years. METHOD: The method is a classic twin study design for estimating inherited versus environmental effects. The sample consisted of 1,188 children from 594 twin...

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Identifiers

PMID: 42138550
DOI: 10.1044/2026_JSLHR-25-00673
PMCID: PMC13288808

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