THESIS
2006
xxiv, 219 leaves : ill. ; 30 cm
Abstract
Viewers exposue to a Virtual Environment (VE) can exhibit symptoms of motion sickness, such as eyestrain and nausea. This type of motion sickness has been referred to as cybersickness and is a major ergonomics concern with the use of VEs (Stanney et al., 1998)....[
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Viewers exposue to a Virtual Environment (VE) can exhibit symptoms of motion sickness, such as eyestrain and nausea. This type of motion sickness has been referred to as cybersickness and is a major ergonomics concern with the use of VEs (Stanney et al., 1998).
Literatures show that visual scene movement perceived during navigation in a VE plays an important role in producing cybersickness. In particular, previous studies have shown that speed of navigation through a VE can significantly affect the levels of cybersickness. The purpose of this research is to study the effects of navigation velocities in different axes on the levels of cybersickness. Due to limitations in resources, the effects of navigation velocities have been studied in only three axes of navigation.
Experiment 1 studied the effects of navigating through a VE in different translational axes (i.e., fore-and-aft, lateral, vertical) on cybersickness. Results indicated that navigations in all three translational axes could significantly increase the level of cybersickness as measured by nausea ratings and Simulator Sickness Questionnaire (SSQ) scores (p<0.01). In addition, participants reported significantly lower sickness level with navigation conditions in the fore-and-aft axis (p<0.05) and navigating in lateral or vertical axes in the same VE resulted in similar levels of cybersickness.
Later experiments would focus on the effects of navigation velocities in the fore-and-aft axis and lateral axis.
Experiment 2 studied the effects of navigation velocities ranged from 3m/s r.m.s. to 150 m/s r.m.s. in fore-and-aft axis on level of cybersickness. Experiment 3 studied the effects of navigation velocities in lateral. In both experiments, a significant main effect of velocities on levels of cybersickness was found (p<0.01) and a nonlinear relationship between navigation velocities in fore-and-aft or lateral axis and levels of cybersickness was identified.
Since a previous study has shown that exposures to an oscillating VE in different rotating axes result in similar levels of cybersickness, this research studies the effects of navigation velocties in only one rotational axis: the yaw axis. Experiment 4 studied the effects of navigation velocities in yaw axis on levels of cybersickness. A significant main effect of navigation velocities on cybersickness was found (p<0.01) and a nonlinear relationship between navigation velocities in yaw axis and levels of cybersickness was identified.
The experimental findings are compared with the past literature concerning visually induced motion sickness with rotating drums. In particular, the consistency among the findings was discussed.
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