Figure 4
Effect of visual stimuli vs PD severity. Correlation between the effect of visual stimuli and PD severity for the whole group of PD subjects. Increase of gait cadence in the forward optic flow condition (above) and increase of stride length with the attentional strategy (below). The changes are computed as the percentage increase of cadence or stride length measured in the considered condition respect that measured in the basal condition. Least square linear regression lines are superimposed. Spearman rank correlation coefficients (r) are reported with significance level.