Vowels in infant-directed speech: More breathy and more variable, but not clearer

Kouki Miyazawa, Takahito Shinya, Andrew Martin, Hideaki Kikuchi, Reiko Mazuka

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    Infant-directed speech (IDS) is known to differ from adult-directed speech (ADS) in a number of ways, and it has often been argued that some of these IDS properties facilitate infants’ acquisition of language. An influential study in support of this view is Kuhl et al. (1997), which found that vowels in IDS are produced with expanded first and second formants (F1/F2) on average, indicating that the vowels are acoustically further apart in IDS than in ADS. These results have been interpreted to mean that the way vowels are produced in IDS makes infants’ task of learning vowel categories easier. The present paper revisits this interpretation by means of a thorough analysis of IDS vowels using a large-scale corpus of Japanese natural utterances. We will show that the expansion of F1/F2 values does occur in spontaneous IDS even when the vowels’ prosodic position, lexical pitch accent, and lexical bias are accounted for. When IDS vowels are compared to carefully read speech (CS) by the same mothers, however, larger variability among IDS vowel tokens means that the acoustic distances among vowels are farther apart only in CS, but not in IDS when compared to ADS. Finally, we will show that IDS vowels are significantly more breathy than ADS or CS vowels. Taken together, our results demonstrate that even though expansion of formant values occurs in spontaneous IDS, this expansion cannot be interpreted as an indication that the acoustic distances among vowels are farther apart, as is the case in CS. Instead, we found that IDS vowels are characterized by breathy voice, which has been associated with the communication of emotional affect.

    Original languageEnglish
    Pages (from-to)84-93
    Number of pages10
    JournalCognition
    Volume166
    DOIs
    Publication statusPublished - 2017 Sep 1

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    Infant-directed Speech
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    Keywords

    • Acoustic analysis
    • Breathiness
    • Infant-directed speech
    • Language acquisition
    • Speech production
    • Vowel variation

    ASJC Scopus subject areas

    • Language and Linguistics
    • Experimental and Cognitive Psychology
    • Developmental and Educational Psychology
    • Linguistics and Language
    • Cognitive Neuroscience

    Cite this

    Vowels in infant-directed speech : More breathy and more variable, but not clearer. / Miyazawa, Kouki; Shinya, Takahito; Martin, Andrew; Kikuchi, Hideaki; Mazuka, Reiko.

    In: Cognition, Vol. 166, 01.09.2017, p. 84-93.

    Research output: Contribution to journalArticle

    Miyazawa, Kouki ; Shinya, Takahito ; Martin, Andrew ; Kikuchi, Hideaki ; Mazuka, Reiko. / Vowels in infant-directed speech : More breathy and more variable, but not clearer. In: Cognition. 2017 ; Vol. 166. pp. 84-93.
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    abstract = "Infant-directed speech (IDS) is known to differ from adult-directed speech (ADS) in a number of ways, and it has often been argued that some of these IDS properties facilitate infants’ acquisition of language. An influential study in support of this view is Kuhl et al. (1997), which found that vowels in IDS are produced with expanded first and second formants (F1/F2) on average, indicating that the vowels are acoustically further apart in IDS than in ADS. These results have been interpreted to mean that the way vowels are produced in IDS makes infants’ task of learning vowel categories easier. The present paper revisits this interpretation by means of a thorough analysis of IDS vowels using a large-scale corpus of Japanese natural utterances. We will show that the expansion of F1/F2 values does occur in spontaneous IDS even when the vowels’ prosodic position, lexical pitch accent, and lexical bias are accounted for. When IDS vowels are compared to carefully read speech (CS) by the same mothers, however, larger variability among IDS vowel tokens means that the acoustic distances among vowels are farther apart only in CS, but not in IDS when compared to ADS. Finally, we will show that IDS vowels are significantly more breathy than ADS or CS vowels. Taken together, our results demonstrate that even though expansion of formant values occurs in spontaneous IDS, this expansion cannot be interpreted as an indication that the acoustic distances among vowels are farther apart, as is the case in CS. Instead, we found that IDS vowels are characterized by breathy voice, which has been associated with the communication of emotional affect.",
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