Figure 2.

Improvement in roll sway for a BVL subject when provided feedback of pelvis sway angle. The upper four panels show the sway angles in degrees of the pelvis and upper trunk while standing feet shoulder width apart, eyes closed on foam without feedback, the lower panels with feedback. a. 50 seconds of the original unfiltered traces of upper trunk and pelvis sway with general trend lines. b. The same traces as in a. after removing the general trend and low pass filtering. c. 20 seconds of the same traces as in a. after removing the general trend and band pass filtering. d. 5 seconds of the same traces as in a. after removing the general trend and high pass filtering.