Effects of emotional intensity under perceptual load: An event-related potentials (ERPs) study
Effects of emotional intensity under perceptual load: An event-related potentials (ERPs) study
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DOI：
10.1016/j.biopsycho.2016.03.006
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发表时间：
2016-05-01
影响因子：
2.6
通讯作者：
Straube, Thomas
中科院分区：
文献类型：
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作者：
Mueller-Bardorff, Miriam;Schulz, Claudia;Straube, Thomas
情绪强度和效价对视觉事件相关电位（ERP）的影响仍然知之甚少，特别是在有限的注意力资源的背景下。在本研究中，我们探讨了不同情绪面部表情的情绪强度对P1，N170，早期后负波（EPN）和晚期正电位（LPP）的影响，同时改变可用注意资源的数量。一个新的刺激集，包括90个全彩色图片的中性，快乐（低，高强度），愤怒（低，高强度）的表情。这些面部表情集中呈现，由两个水平条叠加，参与者参与焦点条任务。注意力资源的可用性在两种情况下，通过操纵焦条任务的难度（低与高知觉负荷）。我们的研究结果表明，强度和效价的影响，任务无关的面部表情的早期（N170）和中期处理阶段（EPN）。此外，知觉负荷的任务相关效应在中间加工阶段逐渐发展，并在LPP的时间窗内得到充分发展。与有限的资源帐户一致，在高知觉负荷下，N170和EPN的效价效应降低。有趣的是，除了这种效价负荷相互作用没有进一步的刺激和任务驱动的因素之间的相互作用得到：情绪强度的影响没有调制的感知负荷的焦点酒吧的任务，表明情绪强度的处理，即使注意力资源受到严重限制。(C)2016由Elsevier B.V.出版
Effects of emotional intensity and valence on visual event-related potentials (ERPs) are still poorly understood, in particular in the context of limited attentional resources. In the present EEG study, we investigated the effect of emotional intensity of different emotional facial expressions on P1, N170, early posterior negativity (EPN) and late positive potential (LPP) while varying the amount of available attentional resources. A new stimulus set comprising 90 full color pictures of neutral, happy (low, high intensity), and angry (low, high intensity) expressions was developed. These facial expressions were presented centrally, superimposed by two horizontal bars, and participants engaged in a focal bars task. Availability of attentional resources was varied in two conditions by manipulating the difficulty of the focal bars task (low vs. high perceptual load). Our findings demonstrate intensity and valence effects of task-irrelevant facial expressions on early (N170) and intermediate processing stages (EPN). In addition, task-related effects of perceptual load evolved at intermediate processing stages and were full blown in the time window of LPP. In line with limited resource accounts, valence effects on N170 and EPN were reduced under high perceptual load. Interestingly, apart from this valence by load interaction no further interactions between stimulus and task-driven factors were obtained: Effects of emotional intensity were not modulated by the perceptual load of the focal bars task, indicating that emotional intensity was processed even though attentional resources were heavily restricted. (C) 2016 Published by Elsevier B.V.