Multisensory and modality specific processing of visual speech in different regions of the premotor cortex.
Multisensory and modality specific processing of visual speech in different regions of the premotor cortex.
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DOI：
10.3389/fpsyg.2014.00389
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发表时间：
2014
影响因子：
3.8
通讯作者：
Callan A
中科院分区：
文献类型：
--
作者：
Callan DE;Jones JA;Callan A
行为和神经影像学研究表明，大脑中与言语产生有关的区域也支持言语感知，特别是在退化的条件下。前运动皮层（PMC）已被证明是活跃的，在观察和执行的行动（“镜像系统”的属性），并可以促进语音感知映射到发音语音手势的单峰和多峰的感觉功能。在这项功能性磁共振成像（fMRI）研究中，参与者识别了说话者在视听环境中发出的元音。（看到说话者清晰的脸，听到她的声音），只能看到（只看到演讲者清晰的脸），仅音频（只听到说话者的声音）条件与不同的音频信号-噪声比，以确定涉及视觉语音手势的多感觉和模态特定处理的PMC的区域。该任务的设计，使识别可以作出高水平的准确性，从视觉刺激控制任务的难度和可理解性的差异。功能性磁共振成像（fMRI）分析的结果显示，在视觉和视听条件下，额下回和PMC的重叠活动。左腹下运动前区皮质（PMvi）表现出多模态（视听）增强与退化的听觉信号的属性。左侧顶下小叶和右侧小脑也表现出这些特性。左腹侧上级和背侧运动前皮层（PMvs/PMd）没有表现出这种多感觉增强效应，但有更大的活动，只有在视听条件下，在这些地区的视觉。结果表明，腹侧前运动皮层的下部区域参与整合多感官信息，而更多的上级和背侧区域的PMC参与映射单峰（在这种情况下，视觉）的语音信号与发音语音手势的感觉功能。
Behavioral and neuroimaging studies have demonstrated that brain regions involved with speech production also support speech perception, especially under degraded conditions. The premotor cortex (PMC) has been shown to be active during both observation and execution of action (“Mirror System” properties), and may facilitate speech perception by mapping unimodal and multimodal sensory features onto articulatory speech gestures. For this functional magnetic resonance imaging (fMRI) study, participants identified vowels produced by a speaker in audio-visual (saw the speaker's articulating face and heard her voice), visual only (only saw the speaker's articulating face), and audio only (only heard the speaker's voice) conditions with varying audio signal-to-noise ratios in order to determine the regions of the PMC involved with multisensory and modality specific processing of visual speech gestures. The task was designed so that identification could be made with a high level of accuracy from visual only stimuli to control for task difficulty and differences in intelligibility. The results of the functional magnetic resonance imaging (fMRI) analysis for visual only and audio-visual conditions showed overlapping activity in inferior frontal gyrus and PMC. The left ventral inferior premotor cortex (PMvi) showed properties of multimodal (audio-visual) enhancement with a degraded auditory signal. The left inferior parietal lobule and right cerebellum also showed these properties. The left ventral superior and dorsal premotor cortex (PMvs/PMd) did not show this multisensory enhancement effect, but there was greater activity for the visual only over audio-visual conditions in these areas. The results suggest that the inferior regions of the ventral premotor cortex are involved with integrating multisensory information, whereas, more superior and dorsal regions of the PMC are involved with mapping unimodal (in this case visual) sensory features of the speech signal with articulatory speech gestures.
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影响因子：
3.2
作者：
Davachi, L;Maril, A;Wagner, AD
通讯作者：
Wagner, AD
影响因子：
9.2
作者：
Calvert, GA;Campbell, R;Brammer, MJ
通讯作者：
Brammer, MJ
DOI：
10.1016/s0926-6410(01)00054-4
发表时间：
2001-10-01
期刊：
COGNITIVE BRAIN RESEARCH
影响因子：
--
作者：
Campbell, R;MacSweeney, M;David, AS
通讯作者：
David, AS
DOI：
10.1016/s0926-6410(00)00054-9
发表时间：
2001-01-01
期刊：
COGNITIVE BRAIN RESEARCH
影响因子：
--
作者：
Callan, DE;Callan, AM;Vatikiotis-Bateson, E
通讯作者：
Vatikiotis-Bateson, E
影响因子：
3.2
作者：
Calvert, GA;Campbell, R
通讯作者：
Campbell, R