Electrophysiological measurement of rapid shifts of attention during visual search
Electrophysiological measurement of rapid shifts of attention during visual search
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作者：
Woodman, GF;Luck, SJ
对包含许多对象的自然视觉场景的感知提出了计算问题，这些问题在孤立地感知对象时是不存在的（1）。视觉研究人员已经在实验室中通过使用视觉搜索任务捕获了现实世界感知的这一属性，在视觉搜索任务中，受试者在包含不同数量的非目标干扰物对象的阵列中搜索目标对象。在许多情况下，检测视觉搜索目标所需的时间随着刺激阵列中物体数量的增加而增加，一些研究人员提出，这反映了对阵列中单个物体的连续注意力应用（2，3）。然而，其他研究人员认为，这种结果模式可能是由于并行处理系统同时识别多个对象的处理能力的限制（4，5），在这里，我们试图解决这个长期存在的争议，通过使用一个电生理标记的时刻，由时刻的注意力方向-N2 pc组件的事件相关电位波形-表明在视觉搜索过程中，注意力在物体之间迅速转移。
The perception of natural visual scenes that contain many objects poses computational problems that are absent when objects are perceived in isolation(1). Vision researchers have captured this attribute of real-world perception in the laboratory by using visual search tasks, in which subjects search for a target object in arrays containing varying numbers of non-target distracter objects. Under many conditions, the amount of time required to detect a visual search target increases as the number of objects in the stimulus array increases, and some investigators have proposed that this reflects the serial application of attention to the individual objects in the array(2,3). However, other investigators have argued that this pattern of results may instead be due to limitations in the processing capacity of a parallel processing system that identifies multiple objects concurrently(4,5), Here we attempt to address this longstanding controversy by using an electrophysiological marker of the moment-by-moment direction of attention-the N2pc component of the event-related potential waveform-to show that attention shifts rapidly among objects during visual search.