Patent ID: RE40427

Claim:
A device for assessing a subject's ability to utilize support surface inputs from one of the subject's first and second supporting legs, such device comprising: means for measuring at least one quantity related to the subject's displacement from a standing equilibrium position; a fixed support surface on which the subject's first leg rests; a movable support surface, on which the subject's second leg rests, the movable support surface being rotatable about a horizontal axis; actuator means for rotating the movable support surface; control means for receiving the quantity related to the subject's displacement from a standing equilibrium position and for controlling the actuator means so that the actuator means causes the movable support surface to rotate on a continuous basis in functional relation to the measured quantity, so that the movable support surface has a sway-reference gain greater than zero; and means for measuring the subject's ability to maintain the standing equilibrium position.