In unilateral VOR damage, compensation is achieved through which mechanism?

In unilateral VOR damage, compensation is achieved through which mechanism?

• A. Head movements
• B. Complete recovery
• C. Increased pursuit
• D. Nerve regrowth

Answer: (A)

When one vestibular system is damaged, the brain adapts by recalibrating how gaze is stabilized and by using other sensory cues to substitute for the lost input. A key driver of this compensation is head movement. Repeated head motion engages the intact vestibular pathways and drives plastic changes in the cerebellum and vestibular nuclei, which adjust the VOR gain and help the eyes generate appropriate compensatory eye movements (catch-up saccades) during head turns. Over time, this learning, combined with greater reliance on visual input and neck proprioception, improves gaze stability despite the unilateral loss. The other options don’t explain the mechanism as well: complete recovery is not the mechanism itself (it can occur variably, but compensation is about the process, not a guaranteed full return). Increased pursuit is not the main compensatory strategy for VOR loss, since smooth pursuit is a different system used for tracking moving targets. Nerve regrowth is not how central compensation occurs in adults—the compensation relies on neural plasticity and sensory substitution, not regeneration of the damaged nerve.

When one vestibular system is damaged, the brain adapts by recalibrating how gaze is stabilized and by using other sensory cues to substitute for the lost input. A key driver of this compensation is head movement. Repeated head motion engages the intact vestibular pathways and drives plastic changes in the cerebellum and vestibular nuclei, which adjust the VOR gain and help the eyes generate appropriate compensatory eye movements (catch-up saccades) during head turns. Over time, this learning, combined with greater reliance on visual input and neck proprioception, improves gaze stability despite the unilateral loss.

The other options don’t explain the mechanism as well: complete recovery is not the mechanism itself (it can occur variably, but compensation is about the process, not a guaranteed full return). Increased pursuit is not the main compensatory strategy for VOR loss, since smooth pursuit is a different system used for tracking moving targets. Nerve regrowth is not how central compensation occurs in adults—the compensation relies on neural plasticity and sensory substitution, not regeneration of the damaged nerve.