Cortical gamma-oscillations modulated by listening and overt repetition of phonemes.
Cortical gamma-oscillations modulated by listening and overt repetition of phonemes.
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DOI：
10.1016/j.neuroimage.2009.10.047
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发表时间：
2010-02-01
期刊：
影响因子：
5.7
通讯作者：
Asano, Eishi
中科院分区：
文献类型：
--
作者：
Fukuda, Miho;Rothermel, Robert;Juhasz, Csaba;Nishida, Masaaki;Sood, Sandeep;Asano, Eishi
关键词：
上级颞回和下罗兰区都参与了人类语言的感知和产生。在这里，我们确定了这些皮层结构是如何被激活的听力和随后的音节的公开发音，通过测量事件相关的伽马振荡作为皮层激活的定量措施。向15名受试者呈现一个由“fee [fi：”、“faa [fα：”、“hee [hi：”或“haa [hα：”组成的听觉音节，并指示他们公开重复每个给定的音节。伽马振荡在上级颞回高度增强在音节介绍，至少增强在音节发音的发病，并再次高度增强后音节发音。伽玛振荡增强在下罗兰区之前和期间音节发音的发病和高峰发生在左侧。下Rolandic位点的子集，更常见于左侧，表现出由音素[f]多于[h]或音素[i：]多于[α：]的发音引起的差异性γ增强。我们的观察结果表明，上级颞回可能是活跃的外部呈现或表达的听觉刺激时，并可能是最低限度的活跃时，即将启动的关节。我们的新的观察音素特定的差分伽玛增强下罗兰区可能部分归因于嘴的位置在音素发音。我们的观察结果支持的假设，定位口发音音素主要是驱动和/或监测的主要感觉运动区的左侧。
Both superior temporal gyrus and inferior Rolandic area have been reported to be involved in perception and production of speech in humans. Here, we determined how these cortical structures were activated by listening and subsequent overt articulation of syllables, by measuring event-related gamma-oscillations as quantitative measures of cortical activation. Fifteen subjects were presented an auditory syllable consisting of either ‘fee [fi:]’, ‘faa [fα:]’, ‘hee [hi:]’, or ‘haa [hα:]’, and were instructed to overtly repeat each given syllable. Gamma-oscillations in the superior temporal gyrus were highly augmented during syllable-presentation, least augmented at the onset of syllable-articulation, and again highly augmented following syllable-articulation. Gamma-oscillations were augmented in the inferior Rolandic area prior to and during syllable-articulation with the onset and peak occurring earlier in the left side. Subsets of the inferior Rolandic sites, more frequently on the left side, showed differential gamma-augmentation elicited by articulation of phoneme [f] more than [h] or phoneme [i:] more than [α:]. Our observations suggest that the superior temporal gyrus may be active when externally-presented or articulated auditory stimuli are present, and may be minimally active when articulation is about to be initiated. Our novel observation of phoneme-specific differential gamma-augmentation in the inferior Rolandic area may be partially attributed to the mouth position during phoneme-articulation. Our observations support the hypothesis that positioning of the mouth to articulate phonemes is predominantly driven and/or monitored by the primary sensorimotor area on the left side.
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