Lexical Properties of Infant-directed Speech of Japanese Mothers and Children's Linguistic Development

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  • Ogura Tamiko
    Graduate School of Child Care Studies, Osaka University of Comprehensive Children Education
  • Masuda Tamami
    Graduate School of Child Care Studies, Osaka University of Comprehensive Children Education
  • Hamabe Naoko
  • Hirai Junko
    Health and Welfare Center of Yamashina and Fukakusa in Kyoto City
  • Miyata Susanne
    Department of Health and Medical Sciences, Aichi Shukutoku University

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Other Title
  • 日本人母親の対乳児発話の語彙特徴と子どもの言語発達
  • ニホンジン ハハオヤ ノ タイ ニュウジ ハツワ ノ ゴイトクチョウ ト コドモ ノ ゲンゴ ハッタツ

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Abstract

<p>This study revealed features in the lexical aspect of infant-directed speech (IDS) by analyzing five minute speech samples of 158 mothers of children aged 9, 12, 14, 18, 21, and 24 months. IDS was divided into four baby talk types; onomatopoeia, baby-form words (further divided into nouns, verbal nouns, adjectives, and communicators), addition of a suffix, and phoneme conversion. The frequency of types and tokens per utterance unit was calculated. Only onomatopoeia showed a significant difference among the age groups. High frequency of onomatopoeia repetition and onomatopoeia markers with special morae were observed. Verbal nouns were significantly more frequent in baby-form words, and phoneme conversion (e.g.: doozo → doojo) occurred as well. The follow-up survey with 127 children from the original group at 33 months revealed the effect of IDS on children's linguistic development. The frequency of baby-form words aged 14 months predicted productive conventional-form words at 33 months. According to its iconicity, baby-form words may have a role in providing a foundation for children to learn rules of arbitrary connections between words and objects.</p>

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