Summary
International Symposium on Nonlinear Theory and its Applications
2009
Session Number:B2L-A
Session:
Number:B2L-A1
Metamorphism in Potential Function while Maintaining Upright Posture during Exposure to Blurred Images
Hiroki Takada, Kazuhiro Fujikake, Masaru Miyao,
pp.-
Publication Date:2009/10/18
Online ISSN:2188-5079
Summary:
We propose a new index, sparse density (SPD), of stationary stabilograms for detecting the metamorphism in the (temporally averaged) potential function of stochastic differential equations, which occurs when a human attempts to maintain an upright posture. It is known that a mathematical model of the body sway can be developed by a stochastic process. The authors have succeeded in finding the nonlinearity in the potential function. In this study, subjects in a standing position were stimulated by a movie scrolling from left to right on a liquid crystal display (LCD). We also measured the degree of determinism in the dynamics of the sway of the center of gravity of the subjects. The Double-Wayland algorithm was used as a novel method. As a result, the dynamics of the body sway in the presence of the stimulus as well as in its absence were considered to be stochastic. The metamorphism in the potential function during exposure to blurred images could be detected by using the SPD.