PERCEPTUAL ADAPTATION IN THE VESTIBULOOCULAR SYSTEM - EEG CORRELATES OF SPATIAL AND TEMPORAL REARRANGEMENT

Spatial-temporal visuomotor rearrangement caused pursuit eye movements to counteract the vestibulo-ocular reflex (VOR). Vertical head noddin g produced horizontal oscillations of a light spot delayed 1 or 150 ms ec. Adaptation resulted in apparent complementary motion of a stationa ry stimulus during nodding. 16 subjects adapted and tested at 150 msec . showed a 10% magnitude apparent motion. Following normal vision, whi le the electroencephalogram (EEG) was recorded, subjects were readapte d at 150 msec. but tested at 1 msec. (to measure temporal generalizati on). Individual performance was correlated with EEG alpha. Adaptation correlated negatively with O(z) and F(z) intensity, and positively wit h O(z) frequency. Temporal generalization correlated positively with O (z) intensity and negatively with O(z) - F(z) phase angle. These resul ts suggest that visuomotor adaptability is related to electrocortical activity.