Previous studies have shown that for high-rate click trains and low-frequency pure tones, interaural time differences (ITDs) at the onset of stimulus contribute most strongly to the overall lateralization percept (receive the largest perceptual weight). Previous studies have also shown that when these stimuli are modulated, ITDs during the rising portion of the modulation cycle receive increased perceptual weight. Baltzell, Cho, Swaminathan, and Best [(2020). J. Acoust. Soc. Am. 147, 3883–3894] measured perceptual weights for a pair of spoken words (“two” and “eight”), and found that word-initial phonemes receive larger weight than word-final phonemes, suggesting a “word-onset dominance” for speech. Generalizability of this conclusion was limited by a coarse temporal resolution and limited stimulus set. In the present study, temporal weighting functions (TWFs) were measured for four spoken words (“two,” “eight,” “six,” and “nine”). Stimuli were partitioned into 30-ms bins, ITDs were applied independently to each bin, and lateralization judgements were obtained. TWFs were derived using a hierarchical regression model. Results suggest that “word-initial” onset dominance does not generalize across words and that TWFs depend in part on acoustic changes throughout the stimulus. Two model-based predictions were generated to account for observed TWFs, but neither could fully account for the perceptual data.

中文翻译：

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语音中耳间时间差的高分辨率时间加权

先前的研究表明，对于高速点击序列和低频纯音，刺激开始时的耳间时间差 (ITD) 对整体侧化感知的贡献最大（接收最大的感知权重）。先前的研究还表明，当这些刺激被调制时，在调制周期上升部分的 ITD 会收到增加的知觉权重。Baltzell、Cho、Swaminathan 和 Best [(2020)。J. 声学。社会党。是。147, 3883–3894] 测量了一对口语单词（“二”和“八”）的感知权重，发现词首音素比词尾音素获得更大的权重，这表明语音具有“词首优势” . 这个结论的普遍性受到粗略的时间分辨率和有限的刺激集的限制。在本研究中，测量了四个口语单词（“二”、“八”、“六”和“九”）的时间加权函数 (TWF)。将刺激划分为 30 毫秒的箱，将 ITD 独立应用于每个箱，并获得侧化判断。TWF 是使用分层回归模型得出的。结果表明，“词首”起始优势不会在词中泛化，并且 TWF 部分取决于整个刺激过程中的声学变化。