Oscillatory alpha-band mechanisms and the deployment of spatial attention to anticipated auditory and visual target locations: supramodal or sensory-specific control mechanisms?
Oscillatory alpha-band mechanisms and the deployment of spatial attention to anticipated auditory and visual target locations: supramodal or sensory-specific control mechanisms?
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DOI：
10.1523/jneurosci.4660-10.2011
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发表时间：
2011-07-06
期刊：
影响因子：
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通讯作者：
Foxe JJ
中科院分区：
文献类型：
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作者：
Banerjee S;Snyder AC;Molholm S;Foxe JJ
人类顶枕叶皮层上的振荡α-波段活动（8-15 Hz）在抑制空间中被忽略区域的输入处理中起着重要作用，在预期包含干扰物的位置的对侧皮层上观察到α-波段功率增加。目前还不清楚在其他感觉方式中，空间注意力的部署是否也有类似的过程。来自病变患者的证据表明，顶叶区域的房子超模态的空间表示。顶叶是阿尔法振荡的主要发生器，这增加了阿尔法是超模态空间注意的神经信号的可能性。此外，当空间注意力部署在视觉中时，在参与位置处的任务无关的听觉输入的处理也被增强，指向跨感官的空间部署之间的自动链接。在这里，我们问是否偏侧α-波段活动也是明显的，在一个纯粹的听觉空间线索任务，以及它是否有相同的潜在的发电机配置在一个纯粹的视觉空间任务。如果这两种感觉系统是共同的，这将为“超模态”注意力理论提供强有力的支持。另一方面，听觉和视觉任务之间的α-波段差异也支持特定于感觉的解释。在一个纯粹的空间任务中，确实观察到α-波段活动的偏侧化变化。至关重要的是，这种阿尔法活动的头皮地形图存在明显差异，这取决于空间注意力部署的感觉系统。研究结果表明，顶叶产生的阿尔法带机制是中央跨模态的注意力部署，但它们被调用的感觉特定的方式。这些数据支持一个互动帐户，从而超模态系统与特定的感官控制系统在部署空间注意力。
Oscillatory alpha-band activity (8–15 Hz) over parieto-occipital cortex in humans plays an important role in suppression of processing for inputs at to-be-ignored regions of space, with increased alpha-band power observed over cortex contralateral to locations expected to contain distractors. It is unclear if similar processes operate during deployment of spatial attention in other sensory modalities. Evidence from lesion patients suggests that parietal regions house supramodal representations of space. The parietal lobes are prominent generators of alpha-oscillations; raising the possibility that alpha is a neural signature of supramodal spatial attention. Further, when spatial attention is deployed within vision, processing of task-irrelevant auditory inputs at attended locations is also enhanced, pointing to automatic links between spatial deployments across senses. Here, we asked whether lateralized alpha-band activity is also evident in a purely auditory spatial-cueing task, and whether it had the same underlying generator configuration as in a purely visuo-spatial task. If common to both sensory-systems, this would provide strong support for “supramodal” attention theory. Alternately, alpha-band differences between auditory and visual tasks would support a sensory-specific account. Lateralized shifts in alpha-band activity were indeed observed during a purely auditory-spatial task. Crucially, there were clear differences in scalp topographies of this alpha-activity depending on the sensory system within which spatial attention was deployed. Findings suggest that parietally-generated alpha-band mechanisms are central to attentional deployments across modalities but that they are invoked in a sensory-specific manner. The data support an interactivity account, whereby a supramodal system interacts with sensory-specific control systems during deployment of spatial attention.