High-density intracranial recordings reveal a distinct site in anterior dorsal precentral cortex that tracks perceived speech.
High-density intracranial recordings reveal a distinct site in anterior dorsal precentral cortex that tracks perceived speech.
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DOI：
10.1002/hbm.25144
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发表时间：
2020-11
影响因子：
4.8
通讯作者：
Ramsey NF
中科院分区：
文献类型：
--
作者：
Berezutskaya J;Baratin C;Freudenburg ZV;Ramsey NF
不同的大脑区域参与语音处理，其中一些区域的特定功能比其他区域更容易理解。特别是，参与背侧中央前皮质（dPCC）在言语知觉仍然存在争议，这一地区的功能的归属或多或少限于运动处理。在这项研究中，我们研究了对故事片语音片段的高密度颅内反应，旨在确定dPCC是否参与连续语音的感知。我们的研究结果表明，dPCC表现出偏好的语音比其他测试的声音。此外，该区域参与语音听觉特性的跟踪，包括语音频谱包络，其节奏短语模式和音高轮廓。DPCC还显示出从感知的语音中滤除噪声的能力。将这些结果与来自运动实验的数据进行比较表明，所识别的区域在dPCC中具有独特的位置，在手运动区的前方并且在口咬合架区域的上级。高密度颅内记录揭示的本研究结果有助于阐明PCC的功能特化，并证明其前背区在连续语音感知中的独特作用。Berezutskaya等人的研究表明，前背中央前皮层内的一个独特区域跟踪感知连续语音的多种听觉特性。该区域与相邻的手和嘴运动区不同，在语音处理中具有独特的作用。
Various brain regions are implicated in speech processing, and the specific function of some of them is better understood than others. In particular, involvement of the dorsal precentral cortex (dPCC) in speech perception remains debated, and attribution of the function of this region is more or less restricted to motor processing. In this study, we investigated high‐density intracranial responses to speech fragments of a feature film, aiming to determine whether dPCC is engaged in perception of continuous speech. Our findings show that dPCC exhibited preference to speech over other tested sounds. Moreover, the identified area was involved in tracking of speech auditory properties including speech spectral envelope, its rhythmic phrasal pattern and pitch contour. DPCC also showed the ability to filter out noise from the perceived speech. Comparing these results to data from motor experiments showed that the identified region had a distinct location in dPCC, anterior to the hand motor area and superior to the mouth articulator region. The present findings uncovered with high‐density intracranial recordings help elucidate the functional specialization of PCC and demonstrate the unique role of its anterior dorsal region in continuous speech perception. Berezutskaya et al. show that a distinct region within anterior dorsal precentral cortex tracks multiple auditory properties of perceived continuous speech. The region is distinct from the adjacent hand and mouth motor areas and has a unique role in speech processing.
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