NUMERICAL ANALYSIS OF STOCHASTIC DIFFERENTIAL EQUATIONS DESCRIBING BODY SWAY WHILE VIEWING 3D VIDEO CLIPS

摘要

Adverse effects, such as asthenopia and visually induced motion sickness (VIMS), may occur when viewing a 3D video clip (3DVC). Disagreement exists between visually perceived movement and the vestibular system's sense of movement during VIMS. The main symptoms include fatigue, drowsiness, facial pallor, cold sweat, and stomach discomfort. Despite various opinions, the cause is not fully known. Therefore, to allow safe viewing of 3DV7Cs, it is necessary to evaluate factors causing VIMS using physiological indicators. Stabilometry investigates the body's equilibrium function. Previous research on VIMS using stabilometry observed an increase in body sway when closing the eyes after viewing a 3DVC. However, in a general analysis index of the stabilometry, no consistent tendency was shown while viewing a 3DVC. We herein measured stabilograms while viewing a. 3DVC intended to induce VIMS. Moreover, a mathematical model is proposed to simulate body sway, and the authors discuss the optimum value using a numerical analysis. As a result, while viewing a 3DVC, the rigidity of the body in the mathematical model increased compared to when no video was viewed. This tendency was observed more in the lateral direction than in the anterior-posterior direction.