Updated on 2024/04/15

写真a

 
TOKUMA Shin-ichi
 
Organization
Faculty of Commerce Professor
External link

Degree

  • PhD in Phonetics ( University of London )

Education

  • 1994.9
     

    University College London   Department of Phonetics, University College London   doctor course   completed

  • 1989.3
     

    Sophia University   Graduate School, Division of Foreign Language   master course   completed

  • 1987.3
     

    Sophia University   Faculty of Foreign Language   graduated

Research History

  • 2007.4 - 　

    中央大学商学部教授

  • 2002.4 - 2007.3

    中央大学商学部助教授

  • 2001.4 - 2002.3

    相模女子大学学芸学部英米文学科助教授

  • 1998.4 - 2001.3

    相模女子大学学芸学部英米文学科専任講師

  • 1995.4 - 1998.3

    上智大学外国語学部一般外国語非常勤講師

  • 1992.10 - 1994.6

    英国ロンドン大学音声言語学科大学院補助教員

  • 1992.9 - 1994.5

    英国グリニッジコミュニティカレッジ日本語非常勤講師

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Professional Memberships

  • International Phonetic Association

  • 日本音声学会

  • International Speech Communication Association

  • Acoustical Society of America

Research Interests

  • Speech Perception

  • Phonetics

Papers

  • How Japanese L2 listeners perceive English silent-centre front vowel Reviewed International journal

    Shinichi Tokuma

    Proceedings of the 20th International Congress of Phonetic Sciences   2462 - 2466   2023.8

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Radek Skarnitzl & Jan Volín (Eds.), Guarant International.  

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  • What's in the Schwa: How Japanese L2 Learners Perceive it (or don't)

    Shinichi Tokuma

    Eigo-Eibei-Bungaku: English Language and Literature   60   83 - 98   2020.2

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    Language：English   Publishing type：Research paper (bulletin of university, research institution)   Publisher：The Society of English Language and Literature, Chuo University  

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  • CROSS-LINGUISTIC PERCEPTION OF ENGLISH /p/-/b/ IN NOISE BY TWO LEVELS OF JAPANESE LEARNERS OF ENGLISH Reviewed

    Shinichi Tokuma

    Proceedings of Phonetics Teaching Learning Conference, UCL, London, August 2015   97 - 100   2015.8

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Research Department of Speech, Hearing and Phonetic Sciences, UCL  

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  • L2 perception of English minimal pairs in different types of clear speech. Reviewed

    Shinichi Tokuma

    Proceedings of Phonetics Teaching Learning Conference, UCL, London, August 2013.   95 - 98   2013.8

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    Language：English   Publishing type：Research paper (scientific journal)  

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  • 英語語強勢のL1/L2知覚におけるF0の役割：聴覚トレーニングは役に立つか？

    Walpurgis 2013   1   15 - 26   2013.3

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    Language：Japanese   Publisher：國學院大學  

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  • Perception of English minimal pairs in noise by Japanese listeners: does clear speech for L2 listeners help? Reviewed

    Shinichi Tokuma, Won Tokuma

    14TH ANNUAL CONFERENCE OF THE INTERNATIONAL SPEECH COMMUNICATION ASSOCIATION (INTERSPEECH 2013), VOLS 1-5   2085 - 2089   2013

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：ISCA-INT SPEECH COMMUNICATION ASSOC  

    This study investigates the effect of different types of clear speech on cross-linguistic perception. In particular, it examines whether the words produced to help L2 interlocutors are perceived more easily by them than the words produced for L1 interlocutors to counteract speech babble noise. English keywords in these conditions are extracted from the LUCID corpus, and they are presented to Japanese listeners for the identification of the words in a minimal pair, in babble noise or without noise. The results demonstrate that when presented in noise, the words produced to help L2 interlocutors are generally perceived more easily by them. This suggests that speech production varies according to listeners' needs in a specific communicative situation. The strong effect of the acoustic characteristics of Japanese /b/ on the perception by Japanese L1 listeners is also discovered. Further acoustic and perceptual research is required to investigate whether a universal or specific cue-enhancement is involved in the clear speech for L2 listeners.

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  • L1/L2 perception of lexical stress with F0 peak-delay: effect of an extra syllable added Reviewed

    Shinichi Tokuma, Yi Xu

    12TH ANNUAL CONFERENCE OF THE INTERNATIONAL SPEECH COMMUNICATION ASSOCIATION 2011 (INTERSPEECH 2011), VOLS 1-5   1892 - +   2011

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：ISCA-INT SPEECH COMMUNICATION ASSOC  

    This study addressed the problems of our previous study [5] and investigated the perceptual effect of F0 peak-delay on L1 / L2 perception of English lexical stress. A trisyllabic English nonsense word 'ninini' /nInInI/ whose F0 was set to reach its peak around the second syllable was embedded in a frame sentence and used as the stimulus of the perceptual experiment. Native English and Japanese speakers were asked to determine lexical stress locations in the experiment. The results showed that in the perception of English lexical stress, delayed F0 peaks which were aligned with the second syllable of the stimulus words perceptually affected both Japanese and English groups, although slightly in a different manner: the Japanese group perceived the delayed F0 peaks as a cue to lexical stress in the first syllable when the peaks were aligned with, or before, the end of /n/ in the second syllable, while the English group had the boundary shifted in an earlier temporal position. It was also discovered that the Japanese group had greater sensitivity to the delayed peak positions. The difference could be attributed to the dependency upon F0 as a perceptual cue and upon its alignment position in a constant / relative timing, as well as the speech rate difference between the two languages.

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  • Perception of English F0 peak-delay by English and Japanese speakers: we hear what they do not hear Reviewed

    Shinichi Tokuma, Won Tokuma

    Proceedings of Phonetics Teaching & Learning Conference 2009   1   1 - 4   2009.8

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Department of Speech, Hearing and Phonetic Sciences, University College London  

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  • The effect of F0 peak-delay on the L1/L2 perception of English lexical stress Reviewed

    Shinichi Tokuma, Yi Xu

    INTERSPEECH 2009: 10TH ANNUAL CONFERENCE OF THE INTERNATIONAL SPEECH COMMUNICATION ASSOCIATION 2009, VOLS 1-5   1   1619 - +   2009

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：ISCA-INT SPEECH COMMUNICATION ASSOC  

    This study investigated the perceptual effect of F0 peak-delay on L1/L2 perception of English lexical stress. A bisyllabic English non-word 'nini' /nini/ whose F0 was set to reach its peak in the second syllable was embedded in a frame sentence and used as the stimulus of the perceptual experiment. Native English and Japanese speakers were asked to determine lexical stress locations in the experiment. The results showed that in the perception of English lexical stress. delayed F0 peaks which were aligned with the second syllable of the stimulus words perceptually affected Japanese and English groups in the same manner: both groups perceived the delayed F0 peaks as a cue to lexical stress in the first syllable when the peaks were aligned with, or before, the end of /n/ in the second syllable. A supplementary experiment conducted on Japanese speakers confirmed the location of the categorical boundary. These findings are supported by the data provided by previous studies on L1 acoustic analysis and on L1/L2 perception of intonation.

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  • Perception of English lexical stress: effect of F0 peak location on English and Japanese speakers. Reviewed

    Shinichi Tokuma

    Proceedings of XVIth International Congress of Phonetic Sciences, Saarbruecken, Germany.August 2007.   1685 - 1688   2007.8

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：International Phonetic Association  

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  • Can a Spoonful of 'Knowledge' Sugar Help the L2 Sounds Go Down? --- A Preliminary Report

    中央英米文学   45 ( 47 )   95 - 108   2007.2

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    Language：English   Publisher：中央大学出版 中央大学英米文学会  

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  • People (well, phoneticians) who knew too much

    英語英米文学   46 ( 46 )   167 - 180   2006.2

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    Language：English   Publisher：中央大学出版 中央大学英米文学会  

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  • Perceptual Space of English Fricatives for Japanese Learners Reviewed

    S.Tokuma, W. Tokuma

    Proceedings of Eurospeech 05   1769 - 1772   2005.9

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Spoken Language System Laboratory, INESC  

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  • Perception of English stress clash by Japanese and English Listeners

    Shinichi Tokuma

    英語英米文学   45   199 - 210   2005.3

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    Language：English   Publisher：中央大学出版 中央大学英米文学会  

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  • How do Japanese learners of English perceive English lexical stress: are they different from native speakers?

    Shinichi Tokuma

    英語英米文学   44   217 - 230   2004.3

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    Language：English   Publisher：中央大学出版 中央大学英米文学会  

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  • Perception of English lexical stress by English and Japanese speakers: effect of duration and “realistic” intensity change. Reviewed

    Shinichi Tokuma

    Proceedings of Eurospeech 03   3   2121 - 2124   2003.9

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：University of Geneva, Switzerland  

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  • Multi-dimensional analysis of sonority Reviewed

    S.Tokuma, T.Arai, M.Komatsu, W.Tokuma

    Proceedings of 7th ICSLP   1   2293 - 2296   2002.9

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ICSLP委員会  

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  • Modelling the perceptual identification of Japanese consonants Reviewed

    S.Tokuma, T.Arai, M.Komatsu, W.Tokuma

    Proceedings of Eurospeech 01   1   391 - 394   2001.9

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ISCA  

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  • スペクトル情報劣化が外国語聴取に及ぼす影響

    相模英米文学   19 ( 19 )   15 - 23   2001.4

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    Language：Japanese   Publisher：相模英米文学会  

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  • The effect of reduced spectral information on Japanese consonant perceptions Reviewed

    S.Tokuma, T.Arai, M.Komatsu, W.Tokuma

    Proceedings of 6th ICSLP   3   750 - 753   2000.11

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ICSLP委員会  

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  • Quality perception of vowels with simulated vertical bar CVC vertical bar formant trajectories Reviewed

    S Tokuma

    SPEECH COMMUNICATION   32 ( 4 )   251 - 265   2000.11

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

    This study investigates the perceived vowel quality change caused by formant undershoot, where vowels in /CVC/ environments are compared with steady-state vowels. In the perceptual experiment of this study, listeners match constant /CVC/ stimuli of /bVb/ or /dVd/ to variable /#V#/ stimuli, using a schematic grid on a PC screen. The grid represents an acoustic vowel diagram, and the subjects change the F1/F2 frequencies of /#V#/ by moving a mouse. The results of the study show that, in vowel quality perception, the performance of subjects was affected by the formant trajectory range of the /CVC/ stimuli. When the formant trajectory range was small, they selected a value between the edge and peak frequencies, while they selected a value outside the trajectory range when it was large. This demonstrated phenomenon is compatible with the results of existing vowel perception studies, although the models proposed by these studies do not account for this phenomenon. (C) 2000 Elsevier Science B.V. All rights reserved.

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  • Perceptual F1-F2 interaction in quality perception of vowels Reviewed

    Shinichi Tokuma

    Proceedings of XIVth ICPhS   1   195 - 198   1999.8

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ICPhS委員会  

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  • How does the vowel quality evaluation process affect the phonological vowel perception? Reviewed

    Tokuma Shinichi

    Sophia Linguistica   41 ( 41 )   193 - 203   1997.9

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：上智大学国際言語情報研  

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  • Quality of a vowel showing formant undershoot Reviewed

    Shinichi Tokuma

    Proceedings of Eurospeech 97   4   2163 - 2166   1997.9

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ISCA  

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  • The problem of the missed target Reviewed

    Shinichi Tokuma

    日本音声学会会報   208   455 - 55   1995.4

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：日本音声学会  

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  • Some arguments on vowel formant shift

    Shinichi Tokuma

    Speech, Hearing and Language   7   235 - 254   1993.10

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    Language：English   Publisher：University College London  

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  • Perception of syllabic nasals: is duration a cue? Reviewed

    Tokuma Shinichi

    Sophia Linguistica   31 ( 31 )   1 - 12   1992.9

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：上智大学国際言語情報研  

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  • アメリカ英語のsyllabic nasal における音響的性質 Reviewed

    Shinichi Tokuma

    日本音声学会大会研究発表論文集   89 - 96   1989.10

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：日本音声学会  

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  • Syllabic Nasals in American English: A study by Experimental Phonetics. Reviewed

    Shinichi Tokuma

    Sophia Linguistica   27 ( 27 )   165 - 172   1989.9

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：上智大学国際言語情報研  

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Books

  • 荒井隆行、菅原勉編『言語・聴覚のための信号とシステム』

    青柳真紀子, 今富摂子, 矢萩悦啓共訳（ Role： Sole author）

    海文堂出版  1998.8 

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    Language：Japanese   Book type：Scholarly book

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MISC

  • シャーロックホームズ『秘密の武器』（大学語学教材）

    曽根田憲三, 曽根田純子, M.G.Brashear

    1999.10

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：開文社出版  

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  • 紀伊半島山間部の母音：十津川村、龍神村、本宮町を中心として

    田中弘樹, 広実義人

    上智大学音声学研究論集   1993.3

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：上智大学音声学研究室  

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  • Syllabic Nasal のdurationとその聴覚

    上智大学音声学研究論集   1991.3

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    Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (other)   Publisher：上智大学音声学研究室  

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Presentations

  • The effect of F0 peak-delay on the L1 & L2 perception of English lexical stress: a progress report

    Speech Science Forum, Research Department of Speech, Hearing & Phonetic Sciences,University College London  2009.5 

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    Language：English   Presentation type：Oral presentation (general)  

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  • Target missed: how does undershoot affect vowel quality

    Phonetics, Phonology, Speech and Hearing Science Seminars and Talks  1994.2 

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    Language：English   Presentation type：Oral presentation (general)  

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Research Projects

  • L1(母語）とL２（外国語）の音声知覚の差異：英語と日本語の場合

    2008.3 - 2010.3

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    Grant type：Competitive

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