Figure 3.

Time series of anti-compensatory saccades in a normal subject, a left UVL patient, and a BVL patient. (A) Anti-compensatory saccades were detected when head impulses were directed either to the left (up, 2–24 s) or to the right side (down, from 27–47 s) in a normal subject. (B) No anti-compensatory saccades were detected when head impulses were directed toward the lesioned left side (up, 0–20 s) in a patient operated from a left vestibular schwannoma and tested in acute stage. In contrast, anti-compensatory saccades could be detected for head impulses toward the intact right side (down, 24–50 s). (C) Few anti-compensatory saccades were detected when head impulses were directed either toward the left (up, 0–22 s) or toward the right side (down, 24–50 s) in a BVL patient. Red curve: head velocity; blue curve: eye velocity; blue circles: peak saccade velocity; red circles: peak head velocity; empty red circles: head impulses in which anti-compensatory saccades were not followed after the head turn; gray circles: non-filtered peak saccade velocity.