No evidence of somatotopic place of articulation feature mapping in motor cortex during passive speech perception
No evidence of somatotopic place of articulation feature mapping in motor cortex during passive speech perception
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DOI：
10.3758/s13423-015-0988-z
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发表时间：
2016-08-01
影响因子：
3.5
通讯作者：
Buchsbaum, Bradley R.
中科院分区：
文献类型：
--
作者：
Arsenault, Jessica S.;Buchsbaum, Bradley R.
言语知觉的运动理论近年来得到了复兴，这是由于许多研究表明言语知觉过程中存在运动系统。在一项关键研究中，Pulvermuller等人（2006）表明，前运动/运动皮层对嘴唇和舌头语音的被动听觉感知有不同的反应。然而，还没有任何研究试图复制近十年前的这一重要发现。本研究的目的是复制Pulvermuller等人（2006）的主要发现，并将其推广到更大的语音标记集，同时应用更强大的统计方法，使用多变量模式分析（MVPA）。参与者进行发音定位器以及语音感知任务，他们被动地听一组八个音节，同时接受功能磁共振成像。单变量和多变量分析均未能找到言语知觉过程中运动或运动前区皮层的躯体位置编码的证据。贝叶斯分析进一步证实了零假设的阳性证据。结果一致表明，虽然嘴唇和舌头区域的运动皮层是敏感的发音器官的运动，他们似乎不优先响应唇和肺泡语音的声音在被动语音感知。
The motor theory of speech perception has experienced a recent revival due to a number of studies implicating the motor system during speech perception. In a key study, Pulvermuller et al. (2006) showed that premotor/motor cortex differentially responds to the passive auditory perception of lip and tongue speech sounds. However, no study has yet attempted to replicate this important finding from nearly a decade ago. The objective of the current study was to replicate the principal finding of Pulvermuller et al. (2006) and generalize it to a larger set of speech tokens while applying a more powerful statistical approach using multivariate pattern analysis (MVPA). Participants performed an articulatory localizer as well as a speech perception task where they passively listened to a set of eight syllables while undergoing fMRI. Both univariate and multivariate analyses failed to find evidence for somatotopic coding in motor or premotor cortex during speech perception. Positive evidence for the null hypothesis was further confirmed by Bayesian analyses. Results consistently show that while the lip and tongue areas of the motor cortex are sensitive to movements of the articulators, they do not appear to preferentially respond to labial and alveolar speech sounds during passive speech perception.