Fluctuation of standing body: Large difference on the time-development between left/right and front/rear fluctuations

摘要

We observed human body fluctuations with different standing conditions by using a mechanical sending device, balance Wii board. We measured the spontaneous fluctuations on both the front/rear and left/right directions. In the present study, we have analyzed the time-dependent fluctuation by focusing the characteristic of time-inversion asymmetry, in addition to the usual analysis of Fourier transformation and autocorrelation function. In order to evaluate the degree of breaking symmetry with time, we have drawn the time-delay maps by changing the time-difference.