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Bilateral vestibular failure impairs visual motion perception even with the head still
W M Grünbauer1, M Dieterich, T Brandt
1Department of Neurology, Klinikum Grosshadern, Ludwig-Maximilians-University, Munich, Germany.
Neuroreport
|July 17, 1998
Summary
Patients with bilateral vestibular failure (BVF) show impaired visual motion perception, especially horizontally. This deficit, even with a stationary head, suggests a central visual mechanism compensating for defective vestibulo-ocular reflex (VOR) is always active.
Area of Science:
- Neuroscience
- Ophthalmology
- Vestibular System
Background:
- Bilateral vestibular failure (BVF) significantly impacts sensory integration.
- The vestibulo-ocular reflex (VOR) normally stabilizes vision during head movements.
- Patients with BVF often experience oscillopsia (visual instability).
Purpose of the Study:
- To investigate visual motion perception in patients with chronic BVF.
- To determine the effect of head position on motion perception deficits.
- To elucidate the underlying visual processing mechanisms in BVF.
Main Methods:
- Assessed visual motion perception in eight BVF patients with a stationary head.
- Measured perception of a single object moving at 40 min of arc/s in orthogonal directions.
- Compared motion perception between horizontal and vertical planes and between dominant and nondominant eyes.
Main Results:
- Motion perception was significantly impaired in BVF patients.
- Horizontal motion perception deficits were more severe than vertical ones.
- Impairment was more pronounced in the dominant eye.
Conclusions:
- A central visual mechanism likely suppresses oscillopsia in BVF patients.
- This compensatory mechanism remains active even with the head stationary.
- The persistent central suppression leads to measurable deficits in visual motion perception.