Figure 2: CoM trajectories for 3 participants (S4=type 1, S3=type 2, S5=type 3), each displaying typical profiles for their respective classification. Type-1 patients typically responded similarly to healthy young subjects. Type-2 and -3 patients showed irregular CoM trajectories. B) Angular displacement of the CoM (heading) as a function of forward displacement. C) Head yaw as a function of forward displacement. Type-1 patients show large reorientations of the head in the direction opposite to the FOE rotation. Type-2 patients show smaller head rotations in the direction opposite to the FOE. Type-3 show little or no head reorientations.