Abstract
Human upright standing can be regarded as a single reversed pendulum, which Supprts a mass of about 60 kg on a fine prop of one meter in height. In this heavy mass are included some oscillatory generators such as respiration, heart beats, muscle activities, etc. Especially, the leg muscle activities play the most important role for body sway. Body sway must be within an extremely limited area, or be controlled to stay in a limited area by some regulators. Under the latter condition a sensory system must exist in order to detect fluctuations of the body.This paper aims at examining the role of sensory information for postural adjustment. With a gravi-coder we analysed the body sway responding to perturbation of sensory information such as vibratory stimuli to the leg muscles, cold stimulation to a labyrinth and pursuit tracking movement by displacement of the center cf gravity.
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