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of head-roll velocity about a naso-occipital axis elevated about 17–19° from Reid’s plane. 8 , 13 Although numerous studies have addressed the psychophysiological effects of GVS on vestibular processing for the control of gaze, 1 , 6 , 39 balance, 7 , 16 , 27 head-neck stability, 10 , 14 , 17 perception, 8 , 35 , 43 mental spatial transformation, 25 visual memory recall, 38 , 42 and motion sickness, 5 , 9 , 36 few have addressed the applicability of GVS as an analog to induce SD. As an early attempt to induce SD, Malcik 29 applied bilateral-bipolar GVS