Delayed Early Vocabulary Development in Children at Family Risk of Dyslexia

Sietske van Viersen, Elise H de Bree, Mathilde Verdam, Ben Maassen, Evelien Krikhaar, Aryan van der Leij, Peter F. de Jong

    OnderzoeksoutputAcademicpeer review

    25 Citaten (Scopus)
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    Purpose: This study aimed to gain more insight into the relation between vocabulary and reading acquisition by examining early growth trajectories in the vocabulary of children at family risk (FR) of dyslexia longitudinally.

    Method: The sample included 212 children from the Dutch Dyslexia Program with and without an FR. Parents reported on their children's receptive and expressive vocabulary size at ages 17, 23, 29, and 35 months using the Dutch MacArthur Communicative Development Inventories. Dyslexia status at the end of Grade 2 (8 years) rendered 3 groups: FR-dyslexic (n = 51), FR-nondyslexic (n = 92), and typically developing-nondyslexic (TD) children (n = 69).

    Results: Repeated measures analyses showed that FR-dyslexic children had lower receptive vocabulary scores from 23 months onward and lower expressive scores from 17 months onward than FR-nondyslexic children. Latent growth curve modeling showed lower initial growth rates in FR-dyslexic children, followed by partial recovery, indicating a delayed increase in receptive and expressive vocabulary. FR-nondyslexic and TD children did not differ.

    Conclusions: Early deficits in receptive and expressive vocabulary are associated with later reading. Early vocabulary growth of FR-dyslexic children is characterized by a delay but not deviance of growth. Vocabulary can be considered an additional risk factor for dyslexia.

    Originele taal-2English
    Pagina's (van-tot)937-949
    Aantal pagina's13
    TijdschriftJournal of speech, language, and hearing research
    Nummer van het tijdschrift4
    StatusPublished - 14-apr.-2017

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