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Corpus-based investigation of L1 phonetic drift and L2 proficiency

Research Project

Project/Area Number 20K13144
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 02100:Foreign language education-related
Research InstitutionUniversity of Tsukuba (2021-2023)
Waseda University (2020)

Principal Investigator

Yazawa Kakeru  筑波大学, 人文社会系, 助教 (50844023)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords母語喪失 / 習熟度 / 海外滞在経験 / 音声コーパス / 日本語 / 英語 / 早期英語教育 / 英語イマージョン教育 / 外国語訛り / 理解可能度 / 海外経験 / 母語音声ドリフト / 訛り度 / 理解度 / 印象評定 / オンライン実験 / 第二言語習得 / 母音 / 第一言語音声ドリフト / 音声ドリフト / 第二言語 / 日英音声コーパス
Outline of Research at the Start

本研究は、第二言語(外国語)を習得することによって第一言語(母語)の発音が変化してしまう『L1音声ドリフト』と呼ばれる現象が、第二言語の習得度とどのような関連にあるかを、大規模日英音声データベース『J-AESOP』を用いて多角的に検証する。本研究の結果は、例えば英語教育の開始年齢を早めたり英語で全面的に教育を行ったりすることによって、国語である日本語の音声にどのような影響があるのかを明らかにすると予想され、我が国の英語教育方針の目標を見定める上で重要な判断材料となると期待される。

Outline of Final Research Achievements

Using a large-scale Japanese-English speech corpus called "J-AESOP", this study examined how the attrition of one's native language (Japanese) pronunciation is related to their level of second language (English) proficiency and experience of living abroad. The results showed that speakers with higher levels of English proficiency were more likely to be judged as having a "foreign accent" in Japanese, but this was only true if they had lived abroad for some time, not if they had learned English in Japan. Another novel finding was that speakers with higher English proficiency levels tended to be judged as "more comprehensible" in Japanese, regardless of whether or not they had lived abroad.

Academic Significance and Societal Importance of the Research Achievements

本研究の結果は、第二言語を高度なレベルまで習得することは必ずしも母語の訛りには直結せず、また発話の分かりやすさという観点からは母語に好影響をも与えうることを示唆している。したがって、日本国内において重点的な英語教育を行なったからといって母語である日本語の発音能力が悪影響を受けることは考えにくく、早期英語教育や英語イマージョン教育の導入に関する弊害は限定的であると考えられる。また、帰国子女の生徒や学生の日本語発音能力については、海外滞在中の母語使用の継続的な保持が重要と考えられる。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (13 results)

All 2024 2023 2022 2021 2020 Other

All Int'l Joint Research (2 results) Journal Article (4 results) (of which Int'l Joint Research: 2 results,  Open Access: 4 results,  Peer Reviewed: 3 results) Presentation (7 results) (of which Int'l Joint Research: 4 results,  Invited: 2 results)

  • [Int'l Joint Research] 西シドニー大学(オーストラリア)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] ソウル大学校(韓国)

    • Related Report
      2020 Research-status Report
  • [Journal Article] More foreign-accented but more comprehensible: Attrition and amelioration of L1 speech in proficient L2 learners2024

    • Author(s)
      Kakeru Yazawa, Takayuki Konishi, Ruben Perez-Ramon, Mariko Kondo
    • Journal Title

      F1000Research

      Volume: -

    • Related Report
      2023 Annual Research Report
    • Open Access / Int'l Joint Research
  • [Journal Article] Spectral and temporal implementation of Japanese speakers’ English vowel categories: A corpus-based study2023

    • Author(s)
      Yazawa Kakeru、Konishi Takayuki、Whang James、Escudero Paola、Kondo Mariko
    • Journal Title

      Laboratory Phonology

      Volume: 14 Issue: 1 Pages: 1-33

    • DOI

      10.16995/labphon.6427

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Transfer of incomplete neutralization: A case of /ei/ and /ou/ in Japanese2022

    • Author(s)
      Kakeru Yazawa
    • Journal Title

      Second Language

      Volume: 20 Pages: 40-59

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 第二言語学習者音声のアノテーションに関する提言-J-AESOP コーパスの開発経験から-2022

    • Author(s)
      矢澤翔
    • Journal Title

      音声研究

      Volume: 26(1)

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] More foreign-accented but more comprehensible: Attrition and amelioration of L1 speech in proficient L2 learners2024

    • Author(s)
      Kakeru Yazawa
    • Organizer
      Linguistics Colloquium at Seoul National University, Korea
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] L2 proficiency predicts L1 accentedness and comprehensibility2023

    • Author(s)
      Yazawa Kakeru
    • Organizer
      The 20th International Congress of Phonetics Sciences
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] A comparison of rhythm metrics for L2 speech2022

    • Author(s)
      Yazawa Kakeru
    • Organizer
      The 11th International Conference on Speech Prosody
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Investigating vowel productions with Japanese-English speech corpus2022

    • Author(s)
      Kakeru Yazawa
    • Organizer
      DaSiC 5
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 日本人英語学習者の母音発話における母語音声ドリフトの検証2021

    • Author(s)
      矢澤翔
    • Organizer
      第35回日本音声学会全国大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 日本人英語学習者による/ei/と/ou/の長音化の転移2021

    • Author(s)
      矢澤翔
    • Organizer
      第34回日本音声学会全国大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 音韻中和の転移:「エイ」と「オウ」の事例から2020

    • Author(s)
      矢澤翔
    • Organizer
      第20回日本第二言語習得学会国際年次大会
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research

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Published: 2020-04-28   Modified: 2025-01-30  

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