Anticipatory attentional suppression of visual features indexed by oscillatory alpha-band power increases: a high-density electrical mapping study.
Anticipatory attentional suppression of visual features indexed by oscillatory alpha-band power increases: a high-density electrical mapping study.
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DOI：
10.1523/jneurosci.5684-09.2010
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发表时间：
2010-03-17
期刊：
影响因子：
--
通讯作者：
Foxe JJ
中科院分区：
文献类型：
--
作者：
Snyder AC;Foxe JJ
视网膜特异性α波段（~10 Hz）振荡功率的增加与视觉空间注意力部署期间对视野不相关部分的处理抑制有很大关系。在这里，我们问这种阿尔法抑制机制是否也在基于特征的注意的非空间预期偏置中发挥作用。视觉文字提示告知受试者即将到来的视觉刺激（S2）的任务相关功能是什么，而高密度脑电图记录被收购。我们研究了线索到S2间隔（~2 s）中的预期振荡活动。受试者被提示在一个试验的基础上参加的颜色或运动方向的一个即将到来的点场阵列，并响应时，他们检测到的一个子集的点不同于大多数沿着目标特征尺寸。我们使用的颜色和运动的功能，明确地说，因为他们有众所周知的，空间上分离的皮层处理区，以区分在处理每个功能的区域在阿尔法功率的变化。当运动是不相关的特征时（即，颜色提示），并且当颜色无关时，来自腹侧区域的α功率增加。因此，阿尔法抑制机制似乎在基于特征的选择过程中以与空间注意力相同的方式运作。
Retinotopically specific increases in alpha-band (~10 Hz) oscillatory power have been strongly implicated in the suppression of processing for irrelevant parts of the visual field during the deployment of visuospatial attention. Here, we asked whether this alpha suppression mechanism also plays a role in the nonspatial anticipatory biasing of feature-based attention. Visual word cues informed subjects what the task-relevant feature of an upcoming visual stimulus (S2) was, while high-density electroencephalographic recordings were acquired. We examined anticipatory oscillatory activity in the Cue-to-S2 interval (~2 s). Subjects were cued on a trial-by-trial basis to attend to either the color or direction of motion of an upcoming dot field array, and to respond when they detected that a subset of the dots differed from the majority along the target feature dimension. We used the features of color and motion, expressly because they have well known, spatially separated cortical processing areas, to distinguish shifts in alpha power over areas processing each feature. Alpha power from dorsal regions increased when motion was the irrelevant feature (i.e., color was cued), and alpha power from ventral regions increased when color was irrelevant. Thus, alpha-suppression mechanisms appear to operate during feature-based selection in much the same manner as has been shown for space-based attention.