Indexical properties influence time-varying amplitude and fundamental frequency contributions of vowels to sentence intelligibility.
Indexical properties influence time-varying amplitude and fundamental frequency contributions of vowels to sentence intelligibility.
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DOI：
10.1016/j.wocn.2015.06.005
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发表时间：
2015-09
影响因子：
1.9
通讯作者：
Fogerty D
中科院分区：
文献类型：
--
作者：
Fogerty D
本研究通过时变振幅（时间包络）和基频（F0）研究了说话者身份的非语言索引信息如何与句子可理解性的贡献相互作用。听力正常的年轻成年人听的句子保留了原来的辅音，但用一个元音代替了元音。这个替代元音选择性地保留了原元音的振幅或F0线索，但取代了语音身份的线索。原始的元音持续时间总是被保留。三个实验通过用相同或不同说话者的声音代替元音，或在声学上改变原始元音来研究索引贡献。这些刺激条件研究了元音超音段和索引属性如何相互作用，并有助于独立于语音信息的可理解性。结果表明，索引性质影响了超分段性质对句子可理解性的相对贡献。在存在相互冲突的索引信息时，F0变化尤为重要。时间包络调制可以显著提高句子的可理解性，但在有索引线索或F0线索的情况下，这种调制效果会得到增强。这些发现表明，F0和其他索引线索可能有助于在感知上将元音的超分段属性与句子的其余部分分组。元音的时间包络调制一旦成功地与保存的信号相结合，可能有助于提高可理解性。
The present study investigated how non-linguistic, indexical information about talker identity interacts with contributions to sentence intelligibility by the time-varying amplitude (temporal envelope) and fundamental frequency (F0). Young normal-hearing adults listened to sentences that preserved the original consonants but replaced the vowels with a single vowel production. This replacement vowel selectively preserved amplitude or F0 cues of the original vowel, but replaced cues to phonetic identity. Original vowel duration was always preserved. Three experiments investigated indexical contributions by replacing vowels with productions from the same or different talker, or by acoustically morphing the original vowel. These stimulus conditions investigated how vowel suprasegmental and indexical properties interact and contribute to intelligibility independently from phonetic information. Results demonstrated that indexical properties influence the relative contribution of suprasegmental properties to sentence intelligibility. F0 variations are particularly important in the presence of conflicting indexical information. Temporal envelope modulations significantly improve sentence intelligibility, but are enhanced when either indexical or F0 cues are available. These findings suggest that F0 and other indexical cues may facilitate perceptually grouping suprasegmental properties of vowels with the remainder of the sentence. Temporal envelope modulations of vowels may contribute to intelligibility once they are successfully integrated with the preserved signal.