Fig. 2. Recording of positional nystagmus in a patient with right-side posterior canal benign paroxysmal positional vertigo. A: Initially, the right-side DH maneuver induced upbeat and CW torsional nystagmus. B: One hour after receiving the Epley maneuver, downbeat nystagmus with a small counterclockwise torsional component was observed during the right-side DH maneuver. Upward deflection indicates upward and CW eye motion from the patient's perspective. CW: clockwise, DH: Dix-Hallpike, LT: torsional position of the left eye, LV: vertical position of the left eye.