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Genetic Evidence for Bidirectional Effects of Early Lexical and Grammatical Development
Author(s) -
Dionne Ginette,
Dale Philip S.,
Boivin Michel,
Plomin Robert
Publication year - 2003
Publication title -
child development
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.103
H-Index - 257
eISSN - 1467-8624
pISSN - 0009-3920
DOI - 10.1111/1467-8624.7402005
Subject(s) - grammar , vocabulary , bootstrapping (finance) , psychology , linguistics , vocabulary development , language development , language acquisition , lexical functional grammar , developmental psychology , econometrics , mathematics , mathematics education , philosophy
This article addresses the autonomy hypothesis of vocabulary and grammar and bootstrapping mechanisms in early language development. Two birth cohorts of 1,505 and 1,049 same‐sex twin pairs from the UK were assessed at 2 and 3 years on grammar and vocabulary, using adapted versions of the MacArthur Communicative Development Inventory. Vocabulary and grammar correlate strongly at both 2 and 3 years in both cohorts. Multivariate genetic modeling reveals a consistently high genetic correlation between vocabulary and grammar at 2 and 3 years. This finding suggests the same genetic influences operate for both vocabulary and grammar, a finding incompatible with traditional autonomy hypothesis, at least in early acquisition. Cross‐lagged longitudinal genetic models indicate both lexical and syntactical bootstrapping operate from 2 to 3 years.