DISCRIMINABILITY AND PROTOTYPICALITY OF NONNATIVE VOWELS
DISCRIMINABILITY AND PROTOTYPICALITY OF NONNATIVE VOWELS
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DOI：
10.1017/s0272263121000978
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发表时间：
2022-02
影响因子：
4.1
通讯作者：
Y. Shinohara;Chao Han;A. Hestvik
中科院分区：
文献类型：
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作者：
Y. Shinohara;Chao Han;A. Hestvik
摘要本研究探讨了非母语音素的辨别性和原型性对错配负波（MMN）事件相关脑电位振幅的影响。我们假设，如果一个频繁发生的（标准）刺激是不典型的听众，一个较弱的预测记忆痕迹将形成和一个较小的MMN将产生语音偏差，无论标准和偏差刺激之间的可辨别性。本研究在oddball范式中测量了日本人听英语元音//和//作为标准刺激和//作为偏离刺激时的MMN波幅。尽管对于日语使用者来说，英语//-//对比比英语//-//对比更容易辨别，但是当日语使用者听到//标准刺激时（即，较不典型的日本人/a/）和/a/偏离刺激，他们的MMN振幅小于当他们听到/a/作为标准刺激时引起的MMN振幅（即，更典型的是日语中的/a/）和//作为一个偏离刺激。标准刺激在听者语音表征中的原型性比标准刺激和偏离刺激之间的区分性更强地调节MMN振幅。
Abstract This study examined how discriminability and prototypicality of nonnative phones modulate the amplitude of the Mismatch Negativity (MMN) event-related brain potential. We hypothesized that if a frequently occurring (standard) stimulus is not prototypical to a listener, a weaker predictive memory trace will be formed and a smaller MMN will be generated for a phonetic deviant, regardless of the discriminability between the standard and deviant stimuli. The MMN amplitudes of Japanese speakers hearing the English vowels /æ/ and /ɑ/ as standard stimuli and /ʌ/ as a deviant stimulus in an oddball paradigm were measured. Although the English /æ/-/ʌ/ contrast was more discriminable than the English /ɑ/-/ʌ/ contrast for Japanese speakers, when Japanese speakers heard the /æ/ standard stimulus (i.e., less prototypical as Japanese /a/) and the /ʌ/ deviant stimulus, their MMN amplitude was smaller than the one elicited when they heard /ɑ/ as a standard stimulus (i.e., more prototypical as Japanese /a/) and /ʌ/ as a deviant stimulus. The prototypicality of the standard stimuli in listeners’ phonological representations modulates the MMN amplitude more robustly than does the discriminability between standard and deviant stimuli.