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空间注意力影响当中性和恐惧面孔在任务无关时的早期加工:C1 成分 EEG 的分类器研究。

Spatial attention affects the early processing of neutral versus fearful faces when they are task-irrelevant: a classifier study of the EEG C1 component.

机构信息

CIMeC/University of Trento, Corso Bettini, 31, 38068, Rovereto, TN, Italy.

Psychology, Faculty of Natural Sciences, University of Stirling, Stirling, FK9 4LA, UK.

出版信息

Cogn Affect Behav Neurosci. 2019 Feb;19(1):123-137. doi: 10.3758/s13415-018-00650-7.

Abstract

EEG studies suggest that the emotional content of visual stimuli is processed rapidly. In particular, the C1 component, which occurs up to 100 ms after stimulus onset and likely reflects activity in primary visual cortex V1, has been reported to be sensitive to emotional faces. However, difficulties replicating these results have been reported. We hypothesized that the nature of the task and attentional condition are key to reconcile the conflicting findings. We report three experiments of EEG activity during the C1 time range elicited by peripherally presented neutral and fearful faces under various attentional conditions: the faces were spatially attended or unattended and were either task-relevant or not. Using traditional event-related potential analysis, we found that the early activity changed depending on facial expression, attentional condition, and task. In addition, we trained classifiers to discriminate the different conditions from the EEG signals. Although the classifiers were not able to discriminate between facial expressions in any condition, they uncovered differences between spatially attended and unattended faces but solely when these were task-irrelevant. In addition, this effect was only present for neutral faces. Our study provides further indication that attention and task are key parameters when measuring early differences between emotional and neutral visual stimuli.

摘要

脑电图研究表明,视觉刺激的情感内容是快速处理的。特别是 C1 成分,它发生在刺激开始后 100 毫秒内,可能反映了初级视觉皮层 V1 的活动,据报道对情绪面孔敏感。然而,已经报道了难以复制这些结果的情况。我们假设任务的性质和注意条件是协调相互矛盾的发现的关键。我们报告了三个实验,在不同的注意条件下,通过外周呈现的中性和恐惧面孔在 C1 时间范围内引起的脑电图活动:面孔被空间注意或未被注意,并且是任务相关的或不相关的。使用传统的事件相关电位分析,我们发现早期活动取决于面部表情、注意条件和任务。此外,我们还训练分类器从脑电图信号中区分不同的条件。虽然分类器在任何条件下都无法区分面部表情,但它们在空间上注意和不注意面孔之间发现了差异,但仅当这些面孔与任务无关时才存在差异。此外,这种效应仅存在于中性面孔中。我们的研究进一步表明,当测量情绪和中性视觉刺激之间的早期差异时,注意力和任务是关键参数。

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