Modulation of motor excitability during speech perception: The role of Broca's area
Modulation of motor excitability during speech perception: The role of Broca's area
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DOI：
10.1162/0898929041502616
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发表时间：
2004-07-01
影响因子：
3.2
通讯作者：
Paus, T
中科院分区：
文献类型：
--
作者：
Watkins, K;Paus, T
对人类和非人类灵长类动物的研究表明，运动和前运动皮层区域参与动作的听觉和视觉感知。先前使用经颅磁刺激（TMS）的研究表明，在言语感知过程中，感知视觉和听觉言语增加了口面部运动系统的兴奋性。然而，这些研究并不能告诉我们是哪个大脑区域调节了这种效果。在这项研究中，我们使用正电子发射断层扫描和经颅磁刺激相结合的技术来识别在言语感知过程中调节运动系统兴奋性的大脑区域。我们的研究结果表明，在听觉语音感知过程中，语音产生背后的运动系统兴奋性增加，这种增加与左侧额下回后部（布罗卡区）的活动显著相关。我们认为，即使在不需要语音输出的情况下，该区域也会对听到的语音做出反应的运动系统进行“启动”，因此，该区域在感知和行动的界面上起作用。
Studies in both human and nonhuman primates indicate that motor and premotor cortical regions participate in auditory and visual perception of actions. Previous studies, using transcranial magnetic stimulation (TMS), showed that perceiving visual and auditory speech increased the excitability of the orofacial motor system during speech perception. Such studies, however, cannot tell us which brain regions mediate this effect. in this study, we used the technique of combining positron emission tomography with TMS to identify the brain regions that modulate the excitability of the motor system during speech perception. Our results show that during auditory speech perception, there is increased excitability of motor system underlying speech production and that this increase is significantly correlated with activity in the posterior part of the left inferior frontal gyrus (Broca's area), We propose that this area "primes" the motor system in response to heard speech even when no speech output is required and, as such, operates at the interface of perception and action.