The goal of this exploratory study is to gain a better understanding of the symptomatology of idiopathic bilateral vestibulopathy (IBV) by characterising as precisely as possible the type and intensity of each patient's peripheral vestibular deficit, and to investigate the link between this symptomatology and some functions influenced by the vestibular system (i.e. cognitive, emotional, vegetative functions).
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Center of pressure (CoP) path length
Timeframe: Posturography is assessed once, during about 30 minutes.
Center of pressure (CoP) path amplitude
Timeframe: Posturography is assessed once, during about 30 minutes.
Center of pressure (CoP) surface area
Timeframe: Posturography is assessed once, during about 30 minutes.
Ocular torsion
Timeframe: Unilateral utricular otolith function is assessed once, during about 30 minutes
Duration estimate
Timeframe: Time perception task is completed once, during about 30 minutes.
Duration production
Timeframe: Time perception task is completed once, during about 30 minutes.
Number of correct tandem steps
Timeframe: Assessment of postural stability and active motion perception is completed once, during about 30 minutes
Deviation distance (Fukuda stepping test)
Timeframe: Assessment of postural stability and active motion perception is completed once, during about 30 minutes
Deviation angle (Fukuda stepping test)
Timeframe: Assessment of postural stability and active motion perception is completed once, during about 30 minutes
Hippocampal volume
Timeframe: MRI exam is completed once, during about 1 hour
Brain activation during functional tasks
Timeframe: MRI exam is completed once, during about 1 hour