"Dumping" of activity within the VOR is possible after unilateral vestibular neurectomy.

The effect of head tilt on postrotatory nystagmus was studied in patients at long time follow-up of complete unilateral vestibular lesions. Ten patients were tested 2-4 years after unilateral vestibular neurectomy. They were all found to have short VOR time constants. However, at postrotatory head tilt the VOR time constant was further shortened. This suggests that the velocity storage mechanisms may function even in cases with complete unilateral vestibular lesions.