Fig 6. Time course of locomotor changes to destabilizing forces.

Ensemble averaged group response to destabilizing force field without the handrail hold. Catch trials were removed and values were normalized to each participant’s average response in pre perturbation block prior to ensemble averaging. Perturbations were applied during cycles 101 to 200. Inset graphs display response at transition points of perturbation (shaded regions). COM sway and step width quickly increased when perturbations were applied, and quickly returned to baseline levels when perturbations were removed.