Motorized Head Impulse Rotator for Horizontal Vestibulo-ocular Reflex

Abstract

To characterize the horizontal angular vestibulo-ocular reflex using a new motorized head impulse rotator and electro-oculography technique.

Motorized head impulse rotator in patients with vestibular schwannoma

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Bilateral Vestibular Hypofunction in Quantitative Head Impulse Test: Clinical Characteristics in 23 Patients

“…Head impulse test measures high-frequency band of vestibular function [10] . The MHIT is motorized version of quantitative head impulse tests, which are capable of detecting dysfunction of individual semicircular canal [8] . When both sides of vestibular organs are defective in head impulse test, the eyes are unable to fixate to the target during fast head motion, and refixation saccades are triggered to catch up the target.…”

“…The gain of the horizontal VOR was determined as the mean of ratio between eye velocity and inverted head velocity of individual impulses calculated during the 30-ms period before the peak head velocity to the right and left. A detailed description of the MHIT has been published earlier [8] . In the MHIT, the gain of VOR is >0.8 among normal population.…”

Recovery of the horizontal vestibulo-ocular reflex in motorized head impulse test is common after vestibular loss

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