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

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.

Citation:
Rice ML, Zubrick SR, Earnest KK, Hoffman L. Longitudinal Study of Language of Twins at Ages 9 and 14 Years: Twinning, Zygosity, and Heritability. J Speech Lang Hear Res. 2026.

Abstract:
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.