Effects of Global Motion Included in Video Movie Provoking an Incident on Visually Induced Motion Sickness

The present study examined the effect of global motion combinations on visually induced motion sickness, presenting global motion analyzed from the video movies that induced the VIMS incident in Japan in 2003. The stimulus movie was presented on LC displays, whose size was either 20 or 37 inch with viewing distance of one meter. The results showed that when the extent of pitch and yaw motion was reduced to one third of from the original motion of the movie had larger effect than when other types of motion was reduced the same ratio of extent. This may be related to the fact that the original movie included larger amount of yaw motion. Moreover, we found that the lager display pro-duced larger total scores, and also larger "Disorientation" sub-socres, of SSQ than the smaller display. This may suggest the discomfort for the larger and smaller displays are produced by mainly different mechanisms.