*** activity specific to peripheral emotional treatment induced by a visual steady state

作     者：Caroline Grand-Maître Vanessa Hadid Michèle W.MacLean Marie-Charlotte Higgins Simon Faghel Soubeyrand Franco Lepore 

作者机构：Centre de recherche en Neurosciences et Cognition(CERNEC)Universitéde MontréalMontrealQuebecCanada Département de PsychologieUniversitéde MontréalMontrealQuebecCanada Département de Sciences biomédicalesUniversitéde MontréalMontrealQuebecCanada 

出 版 物：《Annals of Eye Science》 (眼科学年鉴（英文）)

年 卷 期：2018年第1期

页      面：459-459页

学科分类：08[工学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

主　　题：Emotional expressions electrophysiology frequency labeling steady-state visual evoked potential(ssVEP) spatial visual attention 

摘      要：Background:Research suggests that the analysis of facial expressions by a healthy brain would take place approximately 170 ms after the presentation of a facial expression in the superior temporal sulcus and the fusiform gyrus,mostly in the right *** researchers argue that a fast pathway through the amygdala would allow automatic and early emotional treatment around 90 ms after *** treatment would be done subconsciously,even before this stimulus is perceived and could be approximated by presenting the stimuli quickly on the periphery of the *** present study aimed to identify the neural correlates of a peripheral and simultaneous presentation of emotional expressions through a frequency tagging ***:The presentation of emotional facial expressions at a specific frequency induces in the visual cortex a stable and precise response to the presentation frequency[i.e.,a steady-state visual evoked potential(ssVEP)]that can be used as a frequency tag(i.e.,a frequency-tag to follow the cortical treatment of this ***,the use of different specific stimulation frequencies allowed us to label the different facial expressions presented simultaneously and to obtain a reliable cortical response being associated with(I)each of the emotions and(II)the different times of presentations repeated(1/0.170 ms=~5.8 Hz,1/0.090 ms=~10.8 Hz).To identify the regions involved in emotional discrimination,we subtracted the brain activity induced by the rapid presentation of six emotional expressions of the activity induced by the presentation of the same emotion(reduced by neural adaptation).The results were compared to the hemisphere in which attention was sought,emotion and frequency of ***:The signal-to-noise ratio of the cerebral oscillations referring to the treatment of the expression of fear was stronger in the regions specific to the emotional treatment when they were presented in the subjects peripheral vision,unbeknown