Visual stimuli during motion can induce a sense of physical discomfort. To examine the influence of visual stimuli on the human body, we studied autonomic responses when subjects watched videos of a roller-coaster ride and computer graphics at three different replay speeds. We measured the subjects' heart rates, mean blood pressures, respiration rates, and tidal volumes while they watched the video, and we focused on the relationship between the reaction and replay speeds. As a result, we found that the replay speed influences the heart rate, which changed greatly during a curve scene at double speed. Subjects' respiration rates increased the most when the replay speed was quadrupled during a curve scene.
