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The genetic architecture of oral language, reading fluency, and reading comprehension: A twin study from 7 to 16 years

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JournalDevelopmental Psychology
DateAccepted/In press - 9 Dec 2016
DatePublished (current) - 1 Jun 2017
Issue number6
Volume53
Number of pages15
Pages (from-to)1115-1129
Original languageEnglish

Abstract

This study examines the genetic and environmental etiology underlying the development of oral language and reading skills, and the relationship between them, over a long period of developmental time spanning middle childhood and adolescence. It focuses particularly on the differential relationship between language and two different aspects of reading: reading fluency, and reading comprehension. Structural equation models were applied to language and reading data at 7, 12, and 16 years from the large-scale TEDS twin study. A series of multivariate twin models show a clear patterning of oral language with reading comprehension, as distinct from reading fluency: significant but moderate genetic overlap between oral language and reading fluency (genetic correlation rg = .48-.58 at 7, 12 and 16) contrasts with almost complete genetic overlap between oral language and reading comprehension (rg = .80, at 12 and 16). This pattern is even clearer in a latent factors model, fit to the data aggregated across ages, in which a single factor representing oral language and reading comprehension is correlated with – but distinct from – a second factor representing reading fluency. A distinction between oral language and reading fluency is also apparent in different developmental trajectories: while the heritability of oral language increases over the period from 7 to 16 years (from h2 = .27 to .45), the heritability of reading fluency is high and stable over the same period of time (h2 = .68 – .77).
Keywords: genetic architecture, twin study, language, reading fluency, reading comprehension

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    Research areas

  • Genetic architecture, Language, Reading comprehension, Reading fluency, Twin study

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