Fig. 25. Sinusoidal vestibular ocular reflex in darkness. Sinusoidal head rotation (H) elicits compensatory nystagmic eye movement (E) seen best by comparing head velocity (H) and eye velocity (E). The phase shift between head and eye velocity is Φ. (Redrawn from Shupert C, Fuchs AF: Vision Res 28:585, 1988.)