Figure 2.

Example of a PD subject presenting with marked asymmetry in walking direction around the circle (dashed line) with eyes closed. Numbers indicate the order in which trials were performed. 4/12 PD subjects had similar asymmetry, 2/12 showed less discrepancies between walking directions and 6/12 were similar to cerebellar and control subjects. Trials 1 to 3 were excluded as they were excluded from the analysis to avoid learning effects from the task.