Figure 1

Body movement coordination (mean values) during different phases of the posturography tests for the PD subjects in DBS OFF mode (a eyes closed; b eyes open), in PD subjects in DBS ON mode (c eyes closed; d eyes open), in old controls (e eyes closed; f eyes open) and in young controls (g eyes closed; h eyes open). Note how both the older and younger controls retained the same posture in Periods 1 and Period 4 of balance perturbations, showing that they quickly adapt. The postural strategy in patients with PD took longer to finalize, mostly with DBS OFF and when standing with eyes closed.