A person to be tested steps on a pair of foot steps, and a plurality of body load detectors sense the body load of the person, as applied to the foot steps. An arithmetic circuit receives the body load signals and provides difference signals which are displayed so that the person being tested can observe...http://www.google.de/patents/US4122840?utm_source=gb-gplus-sharePatent US4122840 - Apparatus for analyzing the balancing function of the human body
