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Plots of anteroposterior (AP; y axis) and mediolateral (ML; x axis) excursions of center of pressure (COP) while standing on a stationary (a) or moving (b) platform within a virtual scene that rotated in a counterclockwise direction at a constant velocity of 30 degrees/s and pointing to an object that repeatedly moved one meter from the left to the right for each of the three test periods.
