1983 Volume 2 Issue 2 Pages 27-38
The effect of a 12-day monocular exposure to a visual field tilted 60°was measured using three objective tests; (1) Vestibulo-Ocular Reflex (VOR) in the pendular rotation test, (2) orientation of apparent vertical, (3) standing on one foot. The results showed that orientational adaptation progressed with the length of exposure. However, the amount of the measured adaption was less than the complete compensation, although the subjective tilt in the ordinary environment almost disappeared towards the end. The most notable subjective experience was a swinging of the visual scene experienced when the head was moved. The swing in the ordinary environment disappeared subjectively in the later half of the experimental period, but was still found when tested with a small light source in a dark room. The mechanism underlying the adaptation is discussed in terms of reharmonization among the gravitatory sense, the body position sense, and vision.
