EEG Signal Analysis of Fatigue Caused by Virtual Reality Immersive Visual Experience
Wang Lei1,2, Zhang Tianheng1,2, Guo Miaomiao1,2*, Xu Guizhi1,2#
1(State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, China) 2(Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province, Hebei University of Technology, Tianjin 300130, China)
Abstract：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.
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