[The time course of the oculogyral illusion and displacement of the subjective midline after self-rotation].
We examined the time course of the apparent motion and displacement of the oculogyral illusion (OGI) after cessation of constant rotation (72 deg/s) as a vestibular stimulation. Subjects scaled the apparent motion of a target presented on the objective midline for 120 s after vestibular stimulation (Experiment 1) and the apparent displacement of the same target from the subjective midline (Experiment 2). The magnitude of apparent motion simply decreased from the maximum value as a function of time. In contrast, the magnitude of displacement was nearly zero, or localized near the subjective midline, immediately after the vestibular stimulation. Then, it increased rapidly in the direction of the acceleration, and decreased gradually moreover after 20 to 30 s. These findings suggest that the apparent motion and displacement in OGI could be controlled by different mechanisms, which have different response characteristics to the same vestibular stimulation.
Suetsugu
A
A
Department of Psychology, Faculty of Letters, Kobe University.
Kobiki
M
M
Matsushima
T
T
D000328:Adult; D005133:Eye Movements / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D009038:Motion; D009903:Optical Illusions; D010812:Physical Stimulation; D011434:Proprioception / Q000502:physiology; D012399:Rotation; D013997:Time Factors; D014722:Vestibule, Labyrinth / Q000502:physiology