The Speed of Serial Attention Shifts in Visual Search: Evidence from the N2pc Component.
The Speed of Serial Attention Shifts in Visual Search: Evidence from the N2pc Component.
复制标题
视觉搜索中连续注意力转移的速度：来自 N2pc 组件的证据。
DOI：
10.1162/jocn_a_00898
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发表时间：
2016
影响因子：
3.2
通讯作者：
Grubert A
中科院分区：
文献类型：
--
作者：
Grubert A
在视觉搜索显示中，在干扰物中寻找目标物体通常被认为是基于不同物体之间的注意顺序运动。然而，这种连续的注意力转移的速度仍然存在争议。我们采用了一个搜索任务，鼓励连续分配注意两个目标对象在同一搜索显示和测量N2PC组件，以确定如何快速注意这些对象之间移动。每个显示器包含一个已知颜色的数字（固定颜色目标）和另一个颜色在试验中不可预测地变化的数字（可变颜色目标）以及两个灰色干扰数字。受试者的任务是找到固定颜色的数字，并将其数值与可变颜色的数字进行比较。固定颜色目标的N2pc组件先于可变颜色数字的N2pc组件，这表明这两个目标确实是以固定的序列顺序选择的。对可变颜色数字的N2pc在对固定颜色数字的N2pc之后大约60毫秒出现，这表明注意力可以在视野中的不同目标对象之间非常迅速地重新分配。当搜索显示持续时间增加时，从而放松了对序列选择的时间要求，固定颜色和可变颜色目标的两个N2 pc分量在彼此90毫秒内被引出。结果表明，顺序转移的注意力在不同的目标位置之间可以非常迅速地操作的速度，是符合串行选择模型的视觉搜索的假设。
Finding target objects among distractors in visual search display is often assumed to be based on sequential movements of attention between different objects. However, the speed of such serial attention shifts is still under dispute. We employed a search task that encouraged the successive allocation of attention to two target objects in the same search display and measured N2pc components to determine how fast attention moved between these objects. Each display contained one digit in a known color (fixed-color target) and another digit whose color changed unpredictably across trials (variable-color target) together with two gray distractor digits. Participants' task was to find the fixed-color digit and compare its numerical value with that of the variable-color digit. N2pc components to fixed-color targets preceded N2pc components to variable-color digits, demonstrating that these two targets were indeed selected in a fixed serial order. The N2pc to variable-color digits emerged approximately 60 msec after the N2pc to fixed-color digits, which shows that attention can be reallocated very rapidly between different target objects in the visual field. When search display durations were increased, thereby relaxing the temporal demands on serial selection, the two N2pc components to fixed-color and variable-color targets were elicited within 90 msec of each other. Results demonstrate that sequential shifts of attention between different target locations can operate very rapidly at speeds that are in line with the assumptions of serial selection models of visual search.