Fig. 1.

A: roll eye velocities evoked by sinusoidal oscillation of animal M0091 about naso-occipital axis while upright or tilted forward and backward before (blue traces) and after (red traces) torsional angular vestibuloocular reflex (aVOR) gain was decreased in the prone position. Slow phase eye velocities are shown by solid lines while velocities during saccades are shown as thin dashed lines. Insets: head orientation relative to gravity in which corresponding traces were obtained. Numbers on the right represent the angle between the axis of oscillation and spatial horizontal where positive values – tilt forward. Positive eye velocities represent clockwise rotation relative to the subject. B and C: torsional aVOR gains (B) and gain changes (C) plotted as a function of head tilt. Note: no gravity-dependent gain changes were produced in this experiment.