Fig. 4.

Changes in postural responses during slow (1 deg/s), medium (4 deg/s), and fast (32 deg/s) surface tilts. The plots are aligned with onset of surface tilt. For each velocity, the group average trunk, shank, and CoM displacement during surface tilts is compared between groups (subjects with vestibular loss in black, control subjects in gray) and between visual conditions (dashes, eyes-open; solid lines, eyes-closed). Notice that the largest between-group differences occurred when the surface tilted at 4 deg/s and subjects' eyes were closed (solid lines). The thin black line in all figures is the platform 6 deg rotation displacement. The onset and offset of surface displacement was defined based on first detectable change in surface acceleration.