Effect of Difference in Information Between Vision and Vestibular Labyrinth on a Human Body

For development of motion sickness or visually induced motion sickness (VIMS) caused by sensory conflict, we can set the hypothesis that positive correcting differences in information among afferent input from each sensoria lead to the suppression of symptoms attributed to sensory conflict. In this study, as fundamental verification of above hypothesis, we verified the effect on the human body in case of stimulating only vision, only vestibular-labyrinth system, and vision and vestibular-labyrinth system (in phase and opposite phase), simultaneously. For the stimulating to the vestibular-labyrinth system, the method of delivering electrical stimulus called galvanic vestibular stimulation (GVS) from body surface is utilized. As a result, 2 conclusions were obtained. First was the disruption between subjective and objective evaluation was recognized. It was assumed that the task included vision and GVS with opposite phase had other factor of sensory conflict, which was not considered in this study. Second was significant changes between each task were not confirmed from HRV and RRIV analysis. In addition, there was disruption between the results of subjective and objective evaluation. Therefore, further verification is required with changing study conditions and settings such as posture.