Shared attention for smooth pursuit and saccades
Shared attention for smooth pursuit and saccades
复制标题
共同关注顺利追击和扫视
DOI：
10.1167/13.4.7
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发表时间：
2013-01-01
影响因子：
1.8
通讯作者：
Heinen, Stephen J.
中科院分区：
文献类型：
--
作者：
Jin, Zhenlan;Reeves, Adam;Heinen, Stephen J.
当一个点跟踪目标被一个更大的随其移动的随机点电影图（RDC）包围时，平滑追踪过程中出现的副中央凹刺激的短暂亮度衰减识别能力得到改善（Heinen, Jin, & Watamaniuk, 2011）。这是假设发生的，因为RDC提供了另一种选择，较少的注意力要求的追求驱动，因此释放了视觉感知任务的注意力资源，与那些用于追求点的任务共享。在这里，我们使用RDC作为工具来探索斑点追逐是否也与跳眼系统共享注意力资源。为此，我们开始确定RDC是否可以从对点的追逐中释放注意力来执行扫视任务。观察者将目光扫视到随着现场追踪刺激而移动的四个准中央目标中的一个。目标要么单独移动，要么被RDC包围（100%一致性）。扫视延迟随着RDC的增加而减少，这表明RDC释放了追逐点所需的注意力，然后将其用于扫视任务。在一个实验中，通过要求观察者在扫视目标出现前130毫秒检测到短暂的颜色变化，将注意力固定在中央凹上，从而获得了RDC释放注意力的其他证据。这种操作消除了RDC的优势。结果表明，追逐和跳眼运动控制系统使用的注意力资源是共享的。
Identification of brief luminance decrements on parafoveal stimuli presented during smooth pursuit improves when a spot pursuit target is surrounded by a larger random dot cinematogram (RDC) that moves with it (Heinen, Jin, & Watamaniuk, 2011). This was hypothesized to occur because the RDC provided an alternative, less attention-demanding pursuit drive, and therefore released attentional resources for visual perception tasks that are shared with those used to pursue the spot. Here, we used the RDC as a tool to probe whether spot pursuit also shares attentional resources with the saccadic system. To this end, we set out to determine if the RDC could release attention from pursuit of the spot to perform a saccade task. Observers made a saccade to one of four parafoveal targets that moved with the spot pursuit stimulus. The targets either moved alone or were surrounded by an RDC (100% coherence). Saccade latency decreased with the RDC, suggesting that the RDC released attention needed to pursue the spot, which was then used for the saccade task. Additional evidence that attention was released by the RDC was obtained in an experiment in which attention was anchored to the fovea by requiring observers to detect a brief color change applied 130 ms before the saccade target appeared. This manipulation eliminated the RDC advantage. The results imply that attentional resources used by the pursuit and saccadic eye movement control systems are shared.