Preparatory Encoding of the Fine Scale of Human Spatial Attention.
Preparatory Encoding of the Fine Scale of Human Spatial Attention.
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DOI：
10.1162/jocn_a_01124
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发表时间：
2017-07
影响因子：
3.2
通讯作者：
Gazzaley A
中科院分区：
文献类型：
--
作者：
Voytek B;Samaha J;Rolle CE;Greenberg Z;Gill N;Porat S;Kader T;Rahman S;Malzyner R;Gazzaley A
我们的注意力焦点不断转移：在某个时刻，我们的注意力可能会集中在某个特定点上，而在另一个时刻，我们可能会更广泛地分散注意力。虽然人们对我们将视觉注意力从一个地方转移到另一个地方的机制了解很多，但对于如何将注意力范围从更窄的焦点转移到更广泛的焦点，我们知之甚少。在这里，我们引入了一种新颖的注意力分配任务来检查该过程背后的神经机制。在此任务中，参与者会收到一条信息提示，指示即将到来的目标的位置。该提示可以完美地预测目标的确切位置，也可以以不同程度的确定性指示目标可能出现的大致位置。这个提示之后是一个准备阶段，其中屏幕上除了中央固定十字之外没有任何东西。使用头皮脑电图，我们检查了准备期间的神经活动。我们发现，随着即将发生的目标的精确位置的确定性降低，参与者的响应时间增加，而目标识别准确性降低。此外，准备期视觉皮层α（8-12 Hz）活动的多变量模式编码注意力分布。这种阿尔法编码可以预测近一秒后的行为准确性和响应时间。这些结果让我们深入了解我们如何使用信息来指导我们的注意力分布及其如何影响行为的神经机制。
Our attentional focus is constantly shifting: in one moment our attention may be intently concentrated on a specific spot, while in another moment we might spread our attention more broadly. While much is known about the mechanisms by which we shift our visual attention from place to place, relatively little is know about how we shift the aperture of attention from more narrowly- to more broadly-focused. Here we introduce a novel attentional distribution task to examine the neural mechanisms underlying this process. In this task, participants are presented with an informative cue that indicates the location of an upcoming target. This cue can be perfectly predictive of the exact target location, or it can indicate—with varying degrees of certainty—approximately where the target might appear. This cue is followed by a preparatory period in which there is nothing on the screen except a central fixation cross. Using scalp EEG, we examined neural activity during this preparatory period. We find that with decreasing certainty regarding the precise location of the impending target, participant response times increased while target identification accuracy decreased. Additionally, the multivariate pattern of preparatory period visual cortical alpha (8–12 Hz) activity encoded attentional distribution. This alpha encoding was predictive of behavioral accuracy and response time nearly one second later. These results offer insight into the neural mechanisms underlying how we use information to guide our attentional distribution, and how that influences behavior.
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影响因子：
16.2
作者：
Ester EF;Sprague TC;Serences JT
通讯作者：
Serences JT
影响因子：
16.2
作者：
Reynolds, John H.;Heeger, David J.
通讯作者：
Heeger, David J.
影响因子：
19.9
作者：
Sprague TC;Saproo S;Serences JT
通讯作者：
Serences JT
DOI：
10.1098/rstb.1998.0281
发表时间：
1998-08-29
期刊：
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES
影响因子：
--
作者：
Hillyard, SA;Vogel, EK;Luck, SJ
通讯作者：
Luck, SJ
影响因子：
3.2
作者：
Battelli L;Alvarez GA;Carlson T;Pascual-Leone A
通讯作者：
Pascual-Leone A