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Forma, Vol. 30 (No. 1), pp. 4350, 2015
doi:10.5047/forma.2015.006

Letter

Effect of Unpredictable Motion Component in Video on Body Sway

Akihiro Sugiura1,2*, 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


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