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1 results

  • Parents tune their vowels to the emergence of children’s words

  • Lotte ODIJK, Steven GILLIS
  • Journal:
    Journal of Child Language / Volume 50 / Issue 5 / September 2023
    Published online by Cambridge University Press:
    27 June 2022, pp. 1184-1203
    • Article
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  • The aim of this study was to investigate the acoustic vowel space area in infant directed speech (IDS). The research question is whether the vowel space is expanded or remains constant in IDS. A corpus of spontaneous interactions of 9 dyads followed monthly from the age of 6 to 24 months was analyzed. The occurrences in the parents’ speech of each word that the children eventually acquired were extracted. The surface of the vowel triangle and the convex hull of all vowels were computed. The main result is that the development of the vowel space in IDS follows an inverted U-shaped curve: the vowel space starts relatively small, gradually increases as the child’s first word use approaches, and decreases again afterwards. These findings show that parents adapt their articulation to the evolving linguistic abilities of their child, and this adaptation can be detected at the level of individual lexical items.