Neural tracking measures of speech intelligibility: Manipulating intelligibility while keeping acoustics unchanged
Neural tracking measures of speech intelligibility: Manipulating intelligibility while keeping acoustics unchanged
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DOI：
10.1073/pnas.2309166120
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发表时间：
2023-11
影响因子：
11.1
通讯作者：
I. Karunathilake;Joshua P. Kulasingham;Jonathan Z. Simon
中科院分区：
文献类型：
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作者：
I. Karunathilake;Joshua P. Kulasingham;Jonathan Z. Simon
电生理学研究表明，大脑跟踪不同的语音特征。然而，这些神经跟踪措施是如何通过语音清晰度来调节的，仍然是难以捉摸的。使用噪声声码语音和启动范例，我们解开了潜在的声学混淆的可懂度的神经效应。神经可懂度的影响进行了分析，在声学和语言水平上使用多变量的时间响应函数。在这里，我们发现的自上而下的机制的可理解性和参与的效果的证据，但只有在响应词汇结构的刺激，这表明词汇反应的可理解性的客观措施是强有力的候选人。听觉反应不受可懂度的影响，而只受刺激的潜在声学结构的影响。
Significance Electrophysiological studies have shown that brain tracks different speech features. How these neural tracking measures are modulated by speech intelligibility, however, remained elusive. Using noise-vocoded speech and a priming paradigm, we disentangled the neural effects of intelligibility from the underlying acoustical confounds. Neural intelligibility effects are analyzed at both acoustic and linguistic level using multivariate temporal response functions. Here, we find evidence for an effect of intelligibility and engagement of top–down mechanisms, but only in responses to lexical structure of the stimuli, suggesting that lexical responses are strong candidates for objective measures of intelligibility. Auditory responses are not influenced by intelligibility but only by the underlying acoustic structure of the stimuli.