Learning Phonemic Vowel Length from Naturalistic Recordings of Japanese Infant-Directed Speech

Ricardo A H Bion, Kouki Miyazawa, Hideaki Kikuchi, Reiko Mazuka

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    In Japanese, vowel duration can distinguish the meaning of words. In order for infants to learn this phonemic contrast using simple distributional analyses, there should be reliable differences in the duration of short and long vowels, and the frequency distribution of vowels must make these differences salient enough in the input. In this study, we evaluate these requirements of phonemic learning by analyzing the duration of vowels from over 11 hours of Japanese infant-directed speech. We found that long vowels are substantially longer than short vowels in the input directed to infants, for each of the five oral vowels. However, we also found that learning phonemic length from the overall distribution of vowel duration is not going to be easy for a simple distributional learner, because of the large base-rate effect (i.e., 94% of vowels are short), and because of the many factors that influence vowel duration (e.g., intonational phrase boundaries, word boundaries, and vowel height). Therefore, a successful learner would need to take into account additional factors such as prosodic and lexical cues in order to discover that duration can contrast the meaning of words in Japanese. These findings highlight the importance of taking into account the naturalistic distributions of lexicons and acoustic cues when modeling early phonemic learning.

    Original languageEnglish
    Article numbere51594
    JournalPLoS One
    Volume8
    Issue number2
    DOIs
    Publication statusPublished - 2013 Feb 20

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    learning
    Acoustics
    Learning
    duration
    Cues
    acoustics
    mouth

    ASJC Scopus subject areas

    • Agricultural and Biological Sciences(all)
    • Biochemistry, Genetics and Molecular Biology(all)
    • Medicine(all)

    Cite this

    Learning Phonemic Vowel Length from Naturalistic Recordings of Japanese Infant-Directed Speech. / Bion, Ricardo A H; Miyazawa, Kouki; Kikuchi, Hideaki; Mazuka, Reiko.

    In: PLoS One, Vol. 8, No. 2, e51594, 20.02.2013.

    Research output: Contribution to journalArticle

    Bion, Ricardo A H ; Miyazawa, Kouki ; Kikuchi, Hideaki ; Mazuka, Reiko. / Learning Phonemic Vowel Length from Naturalistic Recordings of Japanese Infant-Directed Speech. In: PLoS One. 2013 ; Vol. 8, No. 2.
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