Mean± SD gain (N=5 chinchillas) for each component of the peak 3D aVOR eye movement response during 2 Hz, 50°/s peak whole-body rotations about the horizontal, LARP and RALP canal axes on the 1st, 3rd, and 7th days of continuous stimulation using a head-mounted multichannel vestibular prosthesis. Before: values measured to head movement with the prosthesis stimulating at constant pulse rates, independent of head velocity, 3–5 hours after prosthesis activation. After: values measured 4–48 hours after the prosthesis was powered off on Day 7. Normal: Responses of 5 normal chinchillas.