A speech envelope landmark for syllable encoding in human superior temporal gyrus

A speech envelope landmark for syllable encoding in human superior temporal gyrus
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人类颞上回音节编码的语音包络标志

DOI:
10.1126/sciadv.aay6279
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发表时间:
2019
期刊:
影响因子:
13.6
通讯作者:
Chang E.F.
Chang E.F.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Oganian Y. ;Chang E.F.

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语音中最显著的声学特征是其强度的调制,由幅度包络捕获。从知觉上讲,包络是言语理解所必需的。然而,代表信封的神经计算及其语言学含义存在很大争议。我们使用高密度颅内录音,而参与者听讲话,以确定如何在人类的上级颞回(STG)的语音皮层区域的信封表示。我们发现,一个定义良好的区域中的中间STG检测声学发作的边缘(局部最大值的包络变化率)。声学分析表明,声学开始的边缘线索音节核发病的时间,而他们的斜率线索音节的压力。合成调幅音刺激表明,陡峭的斜坡引起更大的反应,确认皮层编码的幅度变化,而不是绝对幅度。总体而言,STG编码的时间和幅度的声学开始边缘的语音时间结构的感知的基础。
The most salient acoustic features in speech are the modulations in its intensity, captured by the amplitude envelope. Perceptually, the envelope is necessary for speech comprehension. Yet, the neural computations that represent the envelope and their linguistic implications are heavily debated. We used high-density intracranial recordings, while participants listened to speech, to determine how the envelope is represented in human speech cortical areas on the superior temporal gyrus (STG). We found that a well-defined zone in middle STG detects acoustic onset edges (local maxima in the envelope rate of change). Acoustic analyses demonstrated that timing of acoustic onset edges cues syllabic nucleus onsets, while their slope cues syllabic stress. Synthesized amplitude-modulated tone stimuli showed that steeper slopes elicited greater responses, confirming cortical encoding of amplitude change, not absolute amplitude. Overall, STG encoding of the timing and magnitude of acoustic onset edges underlies the perception of speech temporal structure.
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