Abstract
Man's standing posture is stabilized by visual, vestibular, proprioceptive and other sensors which construct multi-feedback loops. In order to clarify the basic mechanism of such complicated posture control system, it is important to analyse the role and relation of each sensor.
We have already developed a servo-controlled force plate that is horizontally movable following arbitrary wave form. By means of this force plate, random disturbances were given to a subject and ankle joints moment was measured. The sway angles of the body and the legs were also measured with an ITV.
Processing the responses, we found the frequency characteristics of the posture control system. Using the simplified model, the results are discussed from a view-point of control engineering.
