Evaluation of visual factors of visually induced motion sickness by analyzing fixation eye movements and heart rate variability H Yoshida, T Kohama |
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Department of Computational Systems Biology, Kinki University, Japan
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| Videos containing strong vibrational or rotational motion may cause some symptoms similar to motion sickness such as nausea, dizziness and headache, which is called visually induced motion sickness (VIMS). In order to identify the effective motion component for VIMS, we have analyzed heart rate variability and fixation eye movements of subjects viewing videos of which content was restricted to certain visual factors. First, we analyzed fixation eye movements by spectral analysis while subjects were watching random dots which consist of each of three visual factors, such as Pan, Roll and Zoom. The results showed that variability of the eye movements was increased as the experiment session progresses. It means that it is difficult to maintain the attention of fixation as VIMS progresses. Second, we evaluated the heart rate variability while subjects were watching the motion pictures which were not random dots but well controlled motion pictures of an indoor scene and an out outdoor scene. Spectral analysis of the heart rate variability demonstrates that HF/LF measure in the Pan condition has lower values than in the Roll condition. It suggests that Pan motion in the video increases sympathetic nerve activity and it is the most effective visual factors of VIMS. |
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