Top-down alpha oscillatory network interactions during visuospatial attention orienting
Top-down alpha oscillatory network interactions during visuospatial attention orienting
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DOI：
10.1016/j.neuroimage.2016.02.076
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发表时间：
2016-05-15
期刊：
影响因子：
5.7
通讯作者：
Ward, Lawrence M.
中科院分区：
文献类型：
--
作者：
Doesburg, Sam M.;Bedo, Nicolas;Ward, Lawrence M.
神经成像和损伤研究表明，视觉注意力由大脑区域的分布式网络控制。视觉空间注意的隐蔽控制也与早期视觉皮质内阿尔法波段振荡的视网膜调节有关，这被认为是抑制被忽视的视觉空间区域的基础。然而，调节注意控制的分布式网络和更多的焦点振荡机制之间的关系仍然不清楚。本研究评估了注意控制网络中的阿尔法波段定向网络交互作用受视觉空间注意轨迹系统调制的假说。我们使用脑磁图(MEG)成像定位了参与视觉空间注意定向的大脑区域，并使用窄带传输熵研究了激活区域之间的α波段Granger因果交互作用。通过对线索开始后约400ms至700ms之间的阿尔法功率变化的偏侧化来索引将注意力分配到视觉空间一侧的情况。在同一时间段，阿尔法功率的变化与阿尔法波段中从前到后的信息流在阿尔法频段中的偏侧化有关，这些信息来自参与注意控制的不同脑区，包括前扣带回、左额中下回、左颞上回、右侧脑岛和顶下小叶，与早期视觉区域有关。我们对这些结果的解释表明，阿尔法振荡介导的分布式网络相互作用对早期视觉皮质产生自上而下的影响，以调节对视觉空间被忽视区域的加工抑制。(C)爱思唯尔公司出版的2016年。
Neuroimaging and lesion studies indicate that visual attention is controlled by a distributed network of brain areas. The covert control of visuospatial attention has also been associated with retinotopic modulation of alpha-band oscillations within early visual cortex, which are thought to underlie inhibition of ignored areas of visual space. The relation between distributed networks mediating attention control and more focal oscillatory mechanisms, however, remains unclear. The present study evaluated the hypothesis that alpha-band, directed, network interactions within the attention control network are systematically modulated by the locus of visuospatial attention. We localized brain areas involved in visuospatial attention orienting using magnetoencephalographic (MEG) imaging and investigated alpha-band Granger-causal interactions among activated regions using narrow-band transfer entropy. The deployment of attention to one side of visual space was indexed by lateralization of alpha power changes between about 400 ms and 700 ms post-cue onset. The changes in alpha power were associated, in the same time period, with lateralization of anterior-to-posterior information flow in the alpha-band from various brain areas involved in attention control, including the anterior cingulate cortex, left middle and inferior frontal gyri, left superior temporal gyrus, and right insula, and inferior parietal lobule, to early visual areas. We interpreted these results to indicate that distributed network interactions mediated by alpha oscillations exert top-down influences on early visual cortex to modulate inhibition of processing for ignored areas of visual space. (C) 2016 Published by Elsevier Inc.