The N2pc component as an indicator of attentional selectivity
The N2pc component as an indicator of attentional selectivity
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DOI：
10.1016/0013-4694(96)95711-9
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发表时间：
1996-09-01
期刊：
影响因子：
--
通讯作者：
Eimer, M
中科院分区：
文献类型：
--
作者：
Eimer, M
事件相关电位（ERPs）被记录在视觉辨别任务中，刺激阵列中包含一个横向目标和3（实验1）或一个（实验2和3）非目标。在实验1和2中，目标与非目标在形状或颜色方面不同。在实验3中，单词对，与非目标不同的目标，就其内容。要求受试者对目标的身份做出反应。在所有实验中，增强的负性引起的后电极对侧的位置的目标。在形式辨别任务中，这种效应存在于N1，N2和P3时间间隔。在颜色辨别任务中，它仅限于N2时间范围。在单词辨别任务（实验3）中，这种效应只能在左后半球观察到。有人认为，这些侧化的负性反映了N2PC组件，被认为是表示在视觉搜索任务的注意力过滤过程。本研究结果扩展了这一假设表明，这一组件也引起了当目标一起提出只有一个非目标项目。N2pc可能反映了任务相关刺激的注意选择。
Event-related potentials (ERPs) were recorded during visual discrimination tasks in which stimulus arrays were presented that contained one lateral target and 3 (experiment 1) or one (experiments 2 and 3) non-targets. In experiments 1 and 2, targets differed from non-targets with respect to their form or their color. In experiment 3, word pairs were presented, with targets differing from non-targets with respect to their content. Subjects were required to respond to the identity of the target. In all experiments, an enhanced negativity was elicited at posterior electrodes contralateral to the location of the target. In the form discrimination tasks, this effect was present in the N1, N2, and P3 time intervals. In the color discrimination tasks, it was confined to the N2 time range. In the word discrimination task (experiment 3), this effect could only be observed over the left posterior hemisphere. It is argued that these lateralized negativities reflect the N2pc component that is assumed to indicate attentional filtering processes during visual search tasks. The present results extend this assumption by showing that this component is also elicited when targets are presented together with just one non-target item. It is argued that the N2pc may reflect the attentional selection of task-relevant stimuli.