This study has three main goals (1) to explore the effects of electrical stimulations of the peripheral vestibular system(2) to assess the potential of this technique to rehabilitate basic vestibular functions in patients with severe bilateral vestibulopathy, and (3) to take advantage of the unprecedented experimental paradigm provided by the vestibular implant to increase our fundamental knowledge on the contribution of peripheral vestibular function to posture, gait and higher order sensory functions, mechanisms that remain poorly understood.
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Change in Vestibular Ocular Reflex (VOR) amplitude
Timeframe: Immediately after the vestibular electrodes are activated
Change in Vestibular Ocular Reflex (VOR) threshold
Timeframe: Immediately after the vestibular electrodes are activated
Changes in pure tone audiometry measurements
Timeframe: Immediately after the cochlear and/or vestibular electrodes are activated
Changes in speech audiometry measurements
Timeframe: Immediately after the cochlear and/or vestibular electrodes are activated
Changes in logatomes test results
Timeframe: Immediately after the cochlear and/or vestibular electrodes are activated
Changes in the Temporal Binding Window (TBW)
Timeframe: Immediately after the cochlear and/or vestibular electrodes are activated
Changes in the Auditory and Vestibular evoked potentials (AEPs-VEPs)
Timeframe: Immediately after the cochlear and/or vestibular electrodes are activated
Changes in the cortical and subcortical activity
Timeframe: Immediately after the vestibular electrodes are activated
Changes in the Vestibular Evoked Myogenic Potentials (VEMPs)
Timeframe: Immediately after the vestibular electrodes are activated
Changes in motion perception
Timeframe: Immediately after the vestibular electrodes are activated
Changes in gait dynamics while walking at different speeds
Timeframe: Immediately after the vestibular electrodes are activated
Changes in gait dynamics performing the Timed "Up & Go"
Timeframe: Immediately after the vestibular electrodes are activated
Changes in Functional Gait Assessment (FGA) performances
Timeframe: Immediately after the vestibular electrodes are activated
Postural changes (sway threshold and/or amplitudes)
Timeframe: Immediately after the vestibular electrodes are activated
Changes in the dynamic visual acuity
Timeframe: Immediately after the vestibular electrodes are activated
Changes in angular error during a navigation task
Timeframe: Immediately after the vestibular electrodes are activated
Changes in orthostatic hypotension test results (Shellong test)
Timeframe: Before and immediately after the vestibular electrodes are activated
Changes in pupil size (pupillometry)
Timeframe: Before and immediately after the vestibular electrodes are activated