Nine subjects (4 men and 5 women) with a mean age of 47 years (range 40–50 years), were recruited for the study: eight with unilateral vestibular loss after translabyrinthine surgery for vestibular schwannoma, with a mean time since surgery of 8 years (range 1–16 years) and one with congenital unilateral vestibular loss, probably due to an intrauterine cytomegalovirus infection. The total unilateral vestibular loss was confirmed by bi-thermal caloric tests, video head-impulse test of all six semi-circular canals and cervical vestibular evoked myogenic potentials.
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