Frontal cortex selects representations of the talker's mouth to aid in speech perception.
Frontal cortex selects representations of the talker's mouth to aid in speech perception.
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DOI：
10.7554/elife.30387
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发表时间：
2018-02-27
期刊：
影响因子：
7.7
通讯作者：
Beauchamp MS
中科院分区：
文献类型：
--
作者：
Ozker M;Yoshor D;Beauchamp MS
人脸包含多种信息源。在言语感知期间，来自说话者的嘴的视觉信息与来自说话者的声音的听觉信息整合。通过直接记录植入硬膜下电极的患者的小群体神经元的神经反应，我们发现当听觉语音不存在时，视觉皮层对语音的反应增强（使视觉语音特别相关）。感受野映射表明，这种增强是特定的区域的视觉皮层与retinotopic代表的嘴的说话者。额叶皮层和其他大脑区域之间的连通性是通过逐个试验的功率相关性来测量的。观察到额叶皮层与视觉皮层的嘴部区域之间的连接较强;额叶皮层与视觉皮层或听觉皮层的非嘴部区域之间的连接较弱。这些结果表明，从说话者的嘴由额叶皮层的视觉信息的自上而下的选择在视听言语知觉中起着重要的作用。
Human faces contain multiple sources of information. During speech perception, visual information from the talker’s mouth is integrated with auditory information from the talker's voice. By directly recording neural responses from small populations of neurons in patients implanted with subdural electrodes, we found enhanced visual cortex responses to speech when auditory speech was absent (rendering visual speech especially relevant). Receptive field mapping demonstrated that this enhancement was specific to regions of the visual cortex with retinotopic representations of the mouth of the talker. Connectivity between frontal cortex and other brain regions was measured with trial-by-trial power correlations. Strong connectivity was observed between frontal cortex and mouth regions of visual cortex; connectivity was weaker between frontal cortex and non-mouth regions of visual cortex or auditory cortex. These results suggest that top-down selection of visual information from the talker’s mouth by frontal cortex plays an important role in audiovisual speech perception.