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首页> 外文期刊>The European Journal of Neuroscience >Prosodic pitch processing is represented in delta-band EEG and is dissociable from the cortical tracking of other acoustic and phonetic features
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Prosodic pitch processing is represented in delta-band EEG and is dissociable from the cortical tracking of other acoustic and phonetic features

机译：韵律沥青处理在达达乐队脑电图中表示，可从其他声学和拼音特征的皮质跟踪中可接索

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摘要

Speech is central to communication among humans. Meaning is largely conveyed by the selection of linguistic units such as words, phrases and sentences. However, prosody, that is the variation of acoustic cues that tie linguistic segments together, adds another layer of meaning. There are various features underlying prosody, one of the most important being pitch and how it is modulated. Recent fMRI and ECoG studies have suggested that there are cortical regions for pitch which respond primarily to resolved harmonics and that high-gamma cortical activity encodes intonation as represented by relative pitch. Importantly, this latter result was shown to be independent of the cortical tracking of the acoustic energy of speech, a commonly used measure. Here, we investigate whether we can isolate low-frequency EEG indices of pitch processing of continuous narrative speech from those reflecting the tracking of other acoustic and phonetic features. Harmonic resolvability was found to contain unique predictive power in delta and theta phase, but it was highly correlated with the envelope and tracked even when stimuli were pitch-impoverished. As such, we are circumspect about whether its contribution is truly pitch-specific. Crucially however, we found a unique contribution of relative pitch to EEG delta-phase prediction, and this tracking was absent when subjects listened to pitch-impoverished stimuli. This finding suggests the possibility of a separate processing stream for prosody that might operate in parallel to acoustic-linguistic processing. Furthermore, it provides a novel neural index that could be useful for testing prosodic encoding in populations with speech processing deficits and for improving cognitively controlled hearing aids.
机译：言语是人类之间沟通的核心。意义在很大程度上通过选择单词，短语和句子等语言单位来传达。然而，韵律，即与语言段连接在一起的声学线索的变化，增加了另一种含义。潜在地区的各种特征，最重要的是音高之一以及它是如何调制的。最近的FMRI和ECOG研究表明，节距的皮质区域主要用于解决谐波，并且高伽马皮质活动编码由相对间距所代表的语调。重要的是，后一种结果被证明与语音声能量的皮质跟踪无关，常用的措施是独立的。在这里，我们调查我们是否可以从反映其他声学和语音特征的跟踪的那些中隔离连续叙事语音的低频EEG指标。发现谐波可解性在三角洲和θ相中含有独特的预测力，但即使刺激贫透过的刺激，也与包络有高度相关。因此，我们是关于其贡献是否真正特定的贡献。然而，我们发现对EEGδ相预测的相对间距的独特贡献，并且当受试者听到间距贫刺激时，这种跟踪不存在。该发现表明，对于可能与声学语言处理平行运行的韵律的单独处理流的可能性。此外，它提供了一种新的神经指标，可用于测试具有语音处理缺陷的群体中的韵律编码，并用于改善认知控制的助听器。

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