FIG. 3.

Changes in axis of eye response for one rhesus monkey (F234RhD) over 7 days of continual motion-modulated stimulation. Each data vector depicts the 3D axis and magnitude of VOR responses during whole-body, 1 Hz, 50 °/s peak head rotations in darkness about the mean horizontal, LARP, and RALP semicircular canal axes. Vector length indicates the peak response velocity; for comparison, thick axes without markers depict inverse of 50 °/s peak head rotations about each canal axis. Data shown are for peak excitatory responses; curved arrows in inset show the direction of VOR response to excitation of the corresponding semicircular canal in the left labyrinth. Axes for responses to left horizontal SCC excitation are inverted to facilitate consolidation on a single plot, and the direction of rotation indicated by the red arrow is the rightward yaw rotation resulting from left horizontal SCC excitation. Progression over time toward the ideal response is apparent for each axis of head rotation. Each data vector shown on the plot has both a direction and a magnitude, conveying the axis and relative amplitude, respectively, of the VOR response.