Fig. 1

Visual feedback on screen for the a COP group and b COP + COG group. Blank circles represent the real-time COPAP, and filled circle represent the real-time COGAP. These circles move in the vertical direction 16 times greater than the real amount of COPAP or COGAP movements. The width between the two horizontal lines indicates each participant’s 2SD of COGAP displacements on a force plate during quiet standing