Fig. 1

a Schematic representation of the spatial configuration of the force platform, a participant’s feet in the side-by-side position, the participant’s postural limitation boundary (dashed white line), and the COP time series (solid gray line) recorded during the static stance trial. All subsequent figures follow the same spatial orientation defined above. b Representative data from a 12-year-old TD participant showing the postural limitation boundary (dashed black line) and COP time series (solid gray line) during static stance with feet in a side-by-side position