FIG. 5.

Top panel Example of eye movements in response to a clockwise transient about the vertical axis (yaw) and horizontal axis stimulation at 45° azimuth. Top row of top panel Eye position and eye velocity of respectively horizontal (H), vertical (V), and torsion (T) components. Lower row of top panel 3D position and angular velocity of stimulus (S) and eye (A) movements. Gray shaded line is one standard deviation. Bottom panels Plots of relationship between instantaneous eye and head velocity during angular VOR whole body impulses in one subject. Left panel Vertical axis (yaw) impulse. Center and right panels Interaural axis (pitch) and nasal–occipital axis (roll), respectively. RW rightward, LW leftward horizontal impulses relative to the head, RD right side down, LW left side down torsion impulses relative to the head. Each black filled circle is one bin (bin width, 20 ms) of mean eye velocity of six repetitions of the impulse. Solid line Linear regression fitted through the 20-ms bins. Note that a RW yaw head impulse leads to a LW eye movement, a head up pitch impulse results in a downward eye rotation, and a LD roll head impulse leads to a RD torsion eye rotation. These eye movements are according to the right-hand rule defined as positive.