A study of regressive place assimilation in spontaneous speech and its implications for spoken word recognition.
A study of regressive place assimilation in spontaneous speech and its implications for spoken word recognition.
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DOI：
10.1121/1.2772226
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发表时间：
2007-09
期刊：
影响因子：
--
通讯作者：
Laura C. Dilley;M. Pitt
中科院分区：
文献类型：
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作者：
Laura C. Dilley;M. Pitt
退行位置同化是发音变异的一种形式，其中词末齿龈音取代随后的唇音或软颚音的发音，就像当 greenboat 发音为 greenboat 时一样。听众如何恢复想要的单词（例如，绿色，给出的绿色）一直是口语单词识别理论的主要焦点。然而，这种变化在随意、即兴演讲中发生的程度此前尚未有报道。使用自发语音语料库进行了两项发音变异研究。首先，语音标签数据用于识别可能发生同化的上下文，即当词尾齿龈音（/t/、/d/或/n/）后面跟着软腭辅音或唇辅音时。同化的指示相对较少，而删除、声门化或规范发音则更常指示。此外，词汇频率被证明会影响发音。高频词项表现出更多类型的变异。其次，声学分析表明，发音线索的位置（由第二共振峰变化表示）和相对幅度都不足以区分同化与删除和规范变体；只有当额外考虑闭合持续时间时，这三种变体类型才能区分。讨论了单词识别理论的含义。
Regressive place assimilation is a form of pronunciation variation in which a word-final alveolar sound takes the place of articulation of a following labial or velar sound, as when green boat is pronounced greem boat. How listeners recover the intended word (e.g., green, given greem) has been a major focus of spoken word recognition theories. However, the extent to which this variation occurs in casual, unscripted speech has previously not been reported. Two studies of pronunciation variation were conducted using a spontaneous speech corpus. First, phonetic labeling data were used to identify contexts in which assimilation could occur, namely, when a word-final alveolar stop (/t/, /d/, or /n/) was followed by a velar or labial consonant. Assimilation was indicated relatively infrequently, while deletion, glottalization, or canonical pronunciations were more often indicated. Moreover, lexical frequency was shown to affect pronunciation; high frequency lexical items showed more types of variation. Second, acoustic analyses showed that neither place of articulation cues (indicated by second formant variation) nor relative amplitude was sufficient to distinguish assimilated from deleted and canonical variants; only when closure duration was additionally taken into account were these three variant types distinguishable. Implications for theories of word recognition are discussed.