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基于虚拟现实的不同情绪视频下的脑电谱特性

EEG spectral characteristics under virtual reality based on emotional videos
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摘要 目的研究不同情绪类型的虚拟现实(virtual reality,VR)视频刺激下的脑电(electroencephalogram,EEG)特性,通过分析受试者观看VR视频时的EEG能量,探究不同情绪类型VR视频对受试者神经活动的影响。方法首先制作3种情绪类型(正性、中性、负性)的VR视频,招募30名健康受试者(男15人,女15人),让他们观看这些视频,并完成情绪评价,同时采集他们观看任务时的8通道EEG信号。然后对EEG信号做预处理,包括滤波、去除坏导联及坏段、去除眼电成分、插值及重参考。对处理干净的信号通过小波变换进行分频,检测θ、α、β频带的信号能量。结果正性和中性刺激下在全脑范围的各频带脑电能量都显著高于负性刺激;无论何种情绪的VR视频刺激,都表现出右半球的θ能量显著大于左半球的偏侧化现象,且额区和顶区的α能量都显著高于颞区。结论VR情绪视频能有效诱发特定的情绪,且在VR情绪视频刺激下,存在显著的负性偏向,即负性VR刺激下表现出与正性和中性VR刺激不同的脑电谱特性,表明VR下负性情绪对大脑活动影响的特异性。 Objective The electroencephalogram(EEG)characteristics during virtual reality(VR)videos with different emotions were studied.We investigated the effects of emotional VR videos on the neural activities of subjects by analyzing the EEG power and their behavioral results.Methods Firstly,we designed three emotional types of VR videos(positive,neutral and negative)and recruited 30 healthy subjects(15 men and 15 women)who were required to watch these videos while their 8-channel scalp EEG signals were recorded simultaneously.Then the signal was preprocessed,including filtering,removing bad channels and bad trials,removing eye electrical components,interpolation and re-reference.Finally,theta,alpha and beta activities were detected by wavelet transform.Results EEG power under positive and neutral stimulation was significantly greater than that under negative stimulation in the whole brain regions regardless of theta,alpha and beta bands;no matter what types of simulation,the theta power in the right hemisphere was significantly greater than that in the left hemisphere,and the alpha power in the frontal and parietal regions was significant larger than that in the temporal region.Conclusions VR emotional videos could be used to elicit specific emotions;there was a significant negative bias under the stimulation of VR emotional videos and EEG spectral characteristics under negative stimulation were different from those under positive and neutral stimulation,which showed that the negative emotion has a specific effect on brain activities under VR.
作者 李海宝 李颖洁 华旻磊 田丰 杨帮华 LI Haibao;LI Yingjie;HUA Minlei;TIAN Feng;YANG Banghua(School of Communication and Information Engineering,Shanghai University,Shanghai 200444;Shanghai Institute for Advanced Communication and Data Science,Shanghai 200444;Qianweichang College,Shanghai University,Shanghai 200444;Shanghai film college,Shanghai University,Shanghai 200072;School of Mechatronic Engineering and Automation,Shanghai University,Shanghai 200444)
出处 《北京生物医学工程》 2021年第5期478-486,共9页 Beijing Biomedical Engineering
基金 国家自然科学基金(61571283) 国家社科基金艺术学一般项目(17BC043) 国防基础科研计划(JCKY2017413C002)资助。
关键词 情绪视频 脑电 虚拟现实 负性偏向 区域效应 emotional videos electroencephalogram virtual reality negative bias regional effects
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