Human dynamics in gazing at a moving picture (vibration characteristics of C.G. of human body in a standing posture)

This paper deals with human body vibration while gazing at a moving picture. It is said that one gets seventy percent of the information from the external world through one's eyes. We consider that this percentage increases especially when one is gazing at a moving object. One acts reflexively according to the influence of the information received. If one makes a mistake while gazing at moving surroundings under seismic or vibrating floor conditions, a severe accident may occur. This is related to human operating error in an emergency. In this paper, we investigate how one acts reflexively when one is gazing at a moving picture. For a person standing on a force plate gazing at a vibrating picture generated by a personal computer in a dark room, we measured the position of his center of gravity. As a result, it was found that the resonant frequency of a human being is between 0.1 and 0.3 Hz.