Time course of affective bias in visual attention: Convergent evidence from steady-state visual evoked potentials and behavioral data
Time course of affective bias in visual attention: Convergent evidence from steady-state visual evoked potentials and behavioral data
复制标题
DOI：
10.1016/j.neuroimage.2010.06.074
复制
发表时间：
2010-12-01
期刊：
影响因子：
5.7
通讯作者：
Mueller, Matthias M.
中科院分区：
文献类型：
--
作者：
Attar, Catherine Hindi;Andersen, Soren K.;Mueller, Matthias M.
对主要任务的选择性注意可能会因情绪干扰的发生而产生偏差，这些情绪干扰因其内在的刺激意义而不由自主地吸引注意力。在很大程度上未知的是，需要参与的前台任务和情绪干扰之间的竞争性互动的时间进程和规模。我们使用了来自国际情感图片系统(IAPS)的令人愉快、令人不快和中性的图片，这些图片要么以完整的形式呈现，要么以加扰的形式呈现。图片被闪烁的移动随机点叠加在一起，这构成了主要任务，使我们能够记录稳态视觉诱发电位(SSVEP)，作为针对该任务的注意力资源分配的连续测量。受试者被要求注意这些点，并在忽略背景图片的情况下检测短时间间隔的连贯运动。我们发现，与中性图片相比，愉快和不愉快对任务相关处理的影响更大，这反映在SSVEP幅度和目标检测率的显著下降，两者都覆盖了几百毫秒的时间窗口。值得注意的是，与情绪相关的特定效应相比，语义相对于相位置乱图片对任务相关活动的影响要大得多，出现得更早，持续时间更长。观察到语义和情绪图片加工的时间进程在大小和持续时间上的差异，强化了这两个过程的单独功能机制的假设，而不是有利于情绪刺激加工的神经活动的普遍增强。(C)2010 Elsevier Inc.保留所有权利。
Selective attention to a primary task can be biased by the occurrence of emotional distractors that involuntary attract attention due to their intrinsic stimulus significance. What is largely unknown is the time course and magnitude of competitive interactions between a to-be-attended foreground task and emotional distractors. We used pleasant, unpleasant and neutral pictures from the International Affective Picture System (IAPS) that were either presented in intact or phase-scrambled form. Pictures were superimposed by a flickering display of moving random dots, which constituted the primary task and enabled us to record steady-state visual evoked potentials (SSVEPs) as a continuous measure of attentional resource allocation directed to the task. Subjects were required to attend to the dots and to detect short intervals of coherent motion while ignoring the background pictures. We found that pleasant and unpleasant relative to neutral pictures more strongly influenced task-related processing as reflected in a significant decrease in SSVEP amplitudes and target detection rates, both covering a time window of several hundred milliseconds. Strikingly, the effect of semantic relative to phase-scrambled pictures on task-related activity was much larger, emerged earlier and lasted longer in time compared to the specific effect of emotion. The observed differences in size and duration of time courses of semantic and emotional picture processing strengthen the assumption of separate functional mechanisms for both processes rather than a general boosting of neural activity in favor of emotional stimulus processing. (C) 2010 Elsevier Inc. All rights reserved.