摘要
虚拟现实可以提供用户关于视、听、体等感官的模拟体验,使其产生沉浸感。随着虚拟现实的迅速普及,佩戴虚拟现实设备引起的脑疲劳问题受到广泛关注。选取16名健康受试者,同步采集观看相同题材传统平面及虚拟现实视频时的脑电信号。首先采用主观问卷对被试者的脑疲劳程度进行分析,使用判断疲劳标准的视屏终端综合症的主观问卷(VDT)和主观疲劳状态量表(SPFS)之后,对比分析两种观看方式引起脑电信号中α、β、θ和δ各波段相对能量以及疲劳因子R值和重心频率的变化差异。结果发现:在VDT主观问卷和SPFS主观量表中,被试观看虚拟视频后的平均分值为0.44±0.22和3.28±1.03,相比观看传统平面视频后的平均分值0.31±0.20和2.26±0.98有显著性增加(P<0.05);在脑电信号的分析中,观看虚拟现实视频后,T3电极位置的α波段相对能量显著减少(观看前后分别为0.249±0.007和0.234±0.005,P<0.05),δ波段相对能量显著性增加(观看前后分别为0.295±0.012和0.314±0.007,P<0.05),重心频率显著性降低(观看前后分别为(7.545±0.950)Hz和(3.717±0.398)Hz,P<0.05),并且这些参数的变化趋势与观看传统平面视频后的参数变化显著不同,呈现出相反的变化趋势;观看虚拟现实视频过程中,脑电信号中的α波段和β波段变化明显,左右后颞叶区和顶叶区到枕叶区中的α波相对能量随时间变化波动下降,β波相对能量随时间先增加后减少,有显著性差异(P<0.05)。相比观看传统平面视频,观看虚拟现实视频更容易从主观感受上产生脑疲劳,脑电信号中特征频段的节律活动变化可以为客观评估虚拟现实引起的脑疲劳提供理论依据。
Virtual reality(VR)is a computer technology that generates realistic images,sounds and other sensations that simulate a user's physical presence in a virtual environment.With the rapid development of virtual reality technique,brain fatigue caused by VR has raised concerns.In this work,16 healthy subjects were recruited,and EEG signals were acquired synchronously while the subjects were watching videos in similar types presented by traditional displayer and virtual reality separately.Two questionnaires were conducted by all subjects to evaluate the state of fatigue before and after the experiment.We also compared the relative energy of alpha,beta,delta and theta band during two experiments.What's more,the fatigue factor and center of gravity were analyzed.Results showed that in the VDT and SPFS questionnaires,the average score was 0.44±0.22 and 3.28±1.03 after watching virtual reality video,which was higher than 0.31±0.20 and 2.26±0.98 after watching traditional plane video,with a significant difference(P<0.05).And from the EEG signals’results,significantly at the temporal lobe area,after watching the VR video,the alpha band energy decreased(before:0.249±0.007,after:0.234±0.005,P<0.05)and the value of gravity frequency decreased(before:7.545±0.950 Hz,after:3.717±0.398 Hz,P<0.05)while the delta band energy increased(before:0.295±0.012,after:0.314±0.007,P<0.05),and moreover,the variation trend of these parameters was significantly different from that after watching traditional plane video,showing an opposite variation trend.Furthermore,the alpha band energy at the temporal lobe and parietal lobe area decreased during watching VR video,while the beta band energy decreased following the initial increase.These results indicated that watching VR videos was more likely to induce subjective fatigue and the changes of rhythm activity in characteristic frequency band of EEG signals,providing theoretical basis for objective evaluation of brain fatigue caused by immersive experience of VR.
作者
王磊
张天恒
郭苗苗
徐桂芝
Wang Lei;Zhang Tianheng;Guo Miaomiao;Xu Guizhi(State Key Laboratory of Reliability and Intelligence of Electrical Equipment,Hebei University of Technology,Tianjin 300130,China;Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province,Hebei University of Technology,Tianjin 300130,China)
出处
《中国生物医学工程学报》
CAS
CSCD
北大核心
2020年第2期160-169,共10页
Chinese Journal of Biomedical Engineering
基金
河北省高等学校科学技术研究项目(QN2017048)
河北省自然科学基金(F2017202197)。
关键词
脑电信号
脑疲劳
虚拟现实
功率谱
virtual reality
EEG
brain fatigue
power spectrum
作者简介
通信作者:郭苗苗,E-mail:gmm@hebut.edu.cn;徐桂芝,中国生物医学工程学会会员。
