Abstract
Cats with restricted head motion faced a large screen on which a visual noise pattern was projected and moved in a horizontal direction at a rate of 1.5-17deg./sec. Horizontal electro-oculogram showed strongly elicited optokinetic nystagmus. Immediately after the direction of the stimulus motion was changed, almost every amplitude of the quick phases predominated slightly over those of the slow phases. Therefore, the average eye position shifted gradually in the direction of the quick phases up to the normal limitation of eye movements. The predominance of quick phases like this could be observed irrespective of the spatial or temporal patterns of the stimulations, and also in nystagmus during head rotations.
