脑磁图
神经科学
后顶叶皮质
阿尔法(金融)
同步(交流)
心理学
相位同步
脑电图
视皮层
皮质(解剖学)
物理
相(物质)
计算机科学
发展心理学
频道(广播)
心理测量学
量子力学
结构效度
计算机网络
作者
Muriel Lobier,J. Matias Palva,Satu Palva
出处
期刊:NeuroImage
[Elsevier]
日期:2017-10-23
卷期号:165: 222-237
被引量:147
标识
DOI:10.1016/j.neuroimage.2017.10.044
摘要
Visuospatial attention prioritizes processing of attended visual stimuli. It is characterized by lateralized alpha-band (8-14 Hz) amplitude suppression in visual cortex and increased neuronal activity in a network of frontal and parietal areas. It has remained unknown what mechanisms coordinate neuronal processing among frontoparietal network and visual cortices and implement the attention-related modulations of alpha-band amplitudes and behavior. We investigated whether large-scale network synchronization could be such a mechanism. We recorded human cortical activity with magnetoencephalography (MEG) during a visuospatial attention task. We then identified the frequencies and anatomical networks of inter-areal phase synchronization from source localized MEG data. We found that visuospatial attention is associated with robust and sustained long-range synchronization of cortical oscillations exclusively in the high-alpha (10-14 Hz) frequency band. This synchronization connected frontal, parietal and visual regions and was observed concurrently with amplitude suppression of low-alpha (6-9 Hz) band oscillations in visual cortex. Furthermore, stronger high-alpha phase synchronization was associated with decreased reaction times to attended stimuli and larger suppression of alpha-band amplitudes. These results thus show that high-alpha band phase synchronization is functionally significant and could coordinate the neuronal communication underlying the implementation of visuospatial attention.
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