Rapid feature-driven changes in the attentional window.
Rapid feature-driven changes in the attentional window.
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DOI：
10.1162/jocn_a_00376
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发表时间：
2013-07
影响因子：
3.2
通讯作者：
Luck SJ
中科院分区：
文献类型：
--
作者：
Leonard CJ;Lopez-Calderon J;Kreither J;Luck SJ
空间注意力必须围绕感兴趣的物体进行调节，以反映物体在视网膜上的大小以及分散注意力的物体的接近程度，这一过程通常由非空间特征引导。本研究使用事件相关电位(ERPs)来研究这种类型的“注意窗”的大小可以多快地围绕由其颜色定义的注视目标物体进行调节，以及这种不同的注意是否影响后续信息在视觉系统中的前馈流动。这项任务涉及到注视时的圆形区域或周围的环状区域，这取决于哪个区域包含被关注的颜色。在不同的试验中，包含被关注颜色的区域是随机变化的，所以每次试验都必须调整注意力的空间分布。我们测量了在任务显示开始后不同时间出现在两个区域之一的无关探测刺激引起的初始感觉ERP反应。这使我们能够根据任务相关特征的位置来衡量调整空间注意力所需的时间量。我们发现，当探测器发生在被关注的点区域内时，探测器引起的感觉反应更大，并且这种效应需要从任务显示开始到探测器开始之间大约175ms的延迟。因此，注意力窗口以反映任务相关刺激的空间范围的方式围绕注视点快速调整，导致随后信息通过视觉系统的前馈流动的变化。
Spatial attention must adjust around an object of interest in a manner that reflects the object’s size on the retina as well as the proximity of distracting objects, a process often guided by nonspatial features. The present study used event-related potentials (ERPs) to investigate how quickly the size of this type of "attentional window" can adjust around a fixated target object defined by its color and whether this variety of attention influences the feedforward flow of subsequent information through the visual system. The task involved attending either to a circular region at fixation or to a surrounding annulus region, depending on which region contained an attended color. The region containing the attended color varied randomly from trial to trial, so the spatial distribution of attention had to be adjusted on each trial. We measured the initial sensory ERP response elicited by an irrelevant probe stimulus that appeared in one of the two regions at different times after task display onset. This allowed us to measure the amount of time required to adjust spatial attention on the basis of the location of the task-relevant feature. We found that the probe-elicited sensory response was larger when the probe occurred within the region of the attended dots, and this effect required a delay of approximately 175 ms between the onset of the task display and the onset of the probe. Thus, the window of attention is rapidly adjusted around the point of fixation in a manner that reflects the spatial extent of a task-relevant stimulus, leading to changes in the feedforward flow of subsequent information through the visual system.