Fig. 1From: Sub-sensory vibratory noise augments the physiologic complexity of postural control in older adultsVibratory Shoe Insoles. Stochastic resonance was delivered to the soles of the feet via controlled vibratory stimuli. Vibrations were generated by piezo-electric actuators mounted within the insoles and driven by a control unit (black box) secured to the outside top of the shoeBack to article page