Using Electroencephalography (EEG) to Examine the Effect of Vergence Accommodation Conflict on Virtual Reality

• Main Authors: Chen, Yen-Ying, 陳彥螢
• Other Authors: Huang, Yi-Pai
• Format: Others
• Language: en_US
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/956j86

碩士 === 國立交通大學 === 光電工程研究所 === 108 === Virtual reality (VR) creates a three-dimensional (3D) virtual world for users, simulating our experiences similar to or different from the real world. However, in stereo viewing, users are generally suffered from vergence accommodation conflict (VAC), which usually induces visual discomfort and mental fatigue. This thesis aims to investigate on how VAC would affect people on VR by manipulating five different levels of 3D Snake content between vergence and accommodation. Both objective and subjective measurements are conducted to examine the effect. For objective measurements, based on independent component analysis (ICA), electroencephalography (EEG) data can be decomposed into three clusters with equivalent dipole source locating in the frontal lobe, the parietal lobe and the occipital lobe. In response to VAC, the parietal and the occipital lobe exhibit significant alpha power attenuation, while the frontal lobe shows no significant differences between two different brain rhythmic activities. Besides, in response to the levels of disparity, the frontal, the parietal and the occipital lobe exhibit no significant changes in all brain rhythmic activities. For subjective measurements, the results of the Simulator Sickness Questionnaire (SSQ) shows that VAC slightly induces oculomotor symptoms and causes almost none of nausea and disorientation symptoms. These findings suggests that the discomfort and the mental fatigue caused by VAC may be slight and be acceptable for VR users.