PDF(Pubmed)
Abstract：
In the current EEG study, we used a dot-probe task in conjunction with backward masking to examine the neural activity underlying awareness and spatial processing of fearful faces and the neural processes for subsequent cued spatial targets. We presented face images under different viewing conditions (subliminal and supraliminal) and manipulated the relation between a fearful face in the pair and a subsequent target. Our mass univariate analysis showed that fearful faces elicit the N2-posterior-contralateral, indexing spatial attention capture, only when they are presented supraliminally. Consistent with this, the multivariate pattern analysis revealed a successful decoding of the location of the fearful face only in the supraliminal viewing condition. Additionally, the spatial attention capture by fearful faces modulated the processing of subsequent lateralised targets that were spatially congruent with the fearful face, in both al and electrophysiological data. There was no evidence for nonconscious processing of the fearful faces in the current paradigm. We conclude that spatial attentional capture by fearful faces requires visual awareness and it is modulated by top-down task demands.
摘要：
在目前的脑电图研究中,我们将点探针任务与后向掩蔽结合使用，以检查恐惧面孔的感知和空间处理背后的神经活动，以及随后提示的空间目标的神经过程。我们在不同的观看条件（潜意识和超视觉）下呈现了人脸图像，并操纵了一对恐惧的面孔与随后的目标之间的关系。我们的质量单变量分析表明，恐惧的面孔会引起N2后对侧，索引空间注意力捕获，只有当它们被超呈现时。与此一致，多元模式分析显示，仅在超视觉观察条件下，才成功解码了恐惧面孔的位置。此外,恐惧面孔的空间注意力捕获调制了随后的横向目标的处理，这些目标在空间上与恐惧面孔一致，在al和电生理数据中。在当前范式中，没有证据表明对恐惧面孔进行无意识处理。我们得出的结论是，恐惧面孔的空间注意力捕获需要视觉意识，并且受到自上而下的任务需求的调节。
