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Date of Award


Document Type


Degree Name

Doctor of Philosophy (Ph.D.)


Visual Studies

First Advisor

Ken Nakayama


Voluntary cyclotorsions were found not to have significant visually induced components in control studies where subjects were required to relax and observe the rotating visual stimuli used in the aforementioned pursuit and tracking tests.

All voluntary cyclotorsions reported here were shown to be pure cycloversions occurring around the visual axes, even though only monocular visual stimuli (when occurring at all) were used.

These results suggest that existing slow pursuit and saccadic systems control trained voluntary cycloversions. I propose that in making voluntary cycloversions, the visuomotor system utilizes the primitive slow phase and fast flicks from the phylogenetically old vestibulo-oculomotor reflex apparatus in a manner similar to the way the voluntary horizontal and vertical slow pursuit versional eye movement systems utilize this control apparatus.