The auditory representation of speech sounds in human motor cortex
The auditory representation of speech sounds in human motor cortex
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DOI：
10.7554/elife.12577
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发表时间：
2016-03-04
期刊：
影响因子：
7.7
通讯作者：
Chang, Edward F.
中科院分区：
文献类型：
--
作者：
Cheung, Connie;Hamiton, Liberty S.;Chang, Edward F.
对于人类来说，听语音会引起运动皮层的神经反应。这一直被争议地解释为语音被处理为发音手势的证据。然而，目前尚不清楚这种神经活动实际上编码了什么信息。当参与者说话和聆听语音时，我们使用高密度直接人类皮质录音。聆听时的运动皮层神经模式与发出相同声音时的神经模式有很大不同。在聆听过程中，我们观察了腹侧运动皮层上部和下部区域的神经活动。在说话过程中，反应分布在运动皮层的发声器官的体位表征中。听时运动皮层的反应结构是按照与听觉皮层类似的声学特征组织的，而不是像说话时那样按照发音特征组织的。运动皮层不包含言语中感知动作的发音表征，而是代表听觉声音信息。
In humans, listening to speech evokes neural responses in the motor cortex. This has been controversially interpreted as evidence that speech sounds are processed as articulatory gestures. However, it is unclear what information is actually encoded by such neural activity. We used high-density direct human cortical recordings while participants spoke and listened to speech sounds. Motor cortex neural patterns during listening were substantially different than during articulation of the same sounds. During listening, we observed neural activity in the superior and inferior regions of ventral motor cortex. During speaking, responses were distributed throughout somatotopic representations of speech articulators in motor cortex. The structure of responses in motor cortex during listening was organized along acoustic features similar to auditory cortex, rather than along articulatory features as during speaking. Motor cortex does not contain articulatory representations of perceived actions in speech, but rather, represents auditory vocal information.