Effect of Unpredictable Motion Component in Video on Body Sway

Akihiro Sugiura^1,2*, Yui Itou¹, Shino Ota¹, Miho Shimura¹, Kunihiko Tanaka¹, Hiroki Takada³ and Masaru Miyao²

¹Faculty of Health Science, Gifu University of Medical Science, 795-1 Ichihiraga-Nagamine, Seki, Gifu 501-3892, Japan
²Graduate School of Information Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
³Graduate School of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui-shi, Fukui 910-8507, Japan
*E-mail address: asugiura@u-gifu-ms.ac.jp

(Received June 14, 2015; Accepted August 24, 2015)

Abstract. In this study, we verified the occurrence of visually induced self-motion during a motion movie that included both unpredictable and predictable components by measuring body sway. Eleven subjects watched a static movie for 1 min and 8 sinusoidally moving movies (direction setting: 2, added unpredictable component settings: 4) for 180 s each. The results revealed the following: First, a viewing depth-direction predictable motion movie had high phase synchronization acuity. In contrast, the unpredictable motion component considerably affected the viewing side-direction motion movie. Second, the relationship between the amount of added unpredictable motion components and the synchronization acuity was poor.

Keywords: Vision, Body Sway, Reciprocator Motion, Unpredictable Motion, Predictable Motion