Listening to speech recruits specific tongue motor synergies as revealed by transcranial magnetic stimulation and tissue-Doppler ultrasound imaging
Listening to speech recruits specific tongue motor synergies as revealed by transcranial magnetic stimulation and tissue-Doppler ultrasound imaging
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DOI：
10.1098/rstb.2013.0418
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发表时间：
2014-06-05
影响因子：
6.3
通讯作者：
Fadiga, L.
中科院分区：
文献类型：
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作者：
D'Ausilio, A.;Maffongelli, L.;Fadiga, L.
单脉冲经颅磁刺激（TMS）诱发的舌运动皮层肌电电位的增强，首次证明了在言语加工过程中听者运动系统的激活。然而，该技术在技术上具有挑战性，并且仅能够对该电机镜像进行相当粗略的测量。在这里，我们将TMS应用于听者的舌头运动区，结合超声组织多普勒成像来描述被动听语音引起的细粒度舌头运动协同作用。受试者听需要不同模式的背腹和前后运动（/ki/，/ko/，/ti/，/to/）的音节。结果表明，被动听语音唤起的运动协同作用的模式，反映了那些发生在语音生产。此外，镜像运动的协同作用更明显，在这些科目表现出良好的性能，在区分语音噪声演示的作用，语音相关的镜像系统在前馈处理扬声器的正在进行的运动计划。
The activation of listener's motor system during speech processing was first demonstrated by the enhancement of electromyographic tongue potentials as evoked by single-pulse transcranial magnetic stimulation (TMS) over tongue motor cortex. This technique is, however, technically challenging and enables only a rather coarse measurement of this motor mirroring. Here, we applied TMS to listeners' tongue motor area in association with ultrasound tissue Doppler imaging to describe fine-grained tongue kinematic synergies evoked by passive listening to speech. Subjects listened to syllables requiring different patterns of dorso-ventral and antero-posterior movements (/ki/, /ko/, /ti/, /to/). Results show that passive listening to speech sounds evokes a pattern of motor synergies mirroring those occurring during speech production. Moreover, mirror motor synergies were more evident in those subjects showing good performances in discriminating speech in noise demonstrating a role of the speech-related mirror system in feed-forward processing the speaker's ongoing motor plan.