Influence of adding visual feedback to the support. Mean normalized step height during different steps of the trial in which the healthy subjects walked with the stiff VMC in combination with the visual feedback (HSV). The step height is calculated during the first, second, and third step of the catch block, during the first, second, and third step of the exposure block, and during the last step of the exposure block. The error bars indicate the standard error of the mean. *p < 0.05.