ABSTRACT
The vestibulo-ocular reflex (VOR) is a low latency reflex that drives the eyes in light or darkness. The VOR is typically measured in the laboratory by passively rotating the subject and measuring their eye movements in complete darkness. Demodulators provided pitch and yaw angular measures of head and eye orientation during experiments. Saccadic intrusions were excluded by automated analysis and the VOR and VVOR gains were determined by regression analysis of slow phase eye velocity versus head velocity. Small correction factor calculated using a rotation matrix was included to compensate for the difference in position between the flux gate sensor on the head versus the location of the eyes in the head. The great sensitivity of the eye and head movement measurement apparatus used in this experiment allowed detection of movements of the head during quiet standing. Experiments were controlled and data were analyzed using the Mac Eyeball software system.
