Question at position 13 The vestibulo-ocular reflex (VOR) serves a critical perceptual function. Which of the following BEST describes this reflex and why it matters?The VOR prevents motion sickness by synchronizing vestibular and visual signals through the thalamus, regulating autonomic functionThe VOR is responsible for detecting changes in gravity by sensing linear acceleration in the otolith organs, helping maintain body posture and balanceThe VOR integrates touch and visual information to maintain balance when walking on uneven ground, stabilizing movementsThe VOR causes the eyes to move in the opposite direction to head movement, keeping the visual scene stable and preventing blurry vision The VOR causes the eyes to move in the same direction as head movement, helping you track moving objects more efficiently and keep focus on the objectsClear my selection

Question

BlackTom AI · Accepted Answer

The vestibulo-ocular reflex (VOR) produces compensatory eye movements opposite to head rotation so the visual scene remains stable on the retina.

1) Relevant knowledge points and concepts
- Semicircular canals detect angular (rotational) acceleration; otolith organs detect linear acceleration/gravity.  
- Vestibular afferents project to vestibular nuclei, which connect to ocular motor nuclei (III and VI) via the medial longitudinal fasciculus (MLF).  
- The VOR is a fast, reflexive circuit with high gain and very short latency that minimizes retinal slip (image movement on the retina) during head movements.  
- Smooth pursuit and saccades are different eye-movement systems; vestibular signals specifically drive compensatory, opposite-direction eye movements.

2) Step-by-step reasoning process
- When the head rotates to the right, the right horizontal semicircular canal is excited and increases firing in the vestibular nerve.  
- Vestibular nuclei send excitatory signals to the left abducens nucleus (and via internuclear fibers to the right oculomotor nucleus) to abduct the left eye and adduct the right eye.  
- Those eye movements are to the left—opposite the head rotation—so gaze remains fixed on the same external point.  
- Because the reflex acts quickly and with near-unit gain, the image on the fovea stays steady and vision does not blur.

3) Calculations / intermediate steps
- No numeric calculation needed; functional sequence: head rotation → semicircular canal signal → vestibular nuclei → ocular motor nuclei → eyes move opposite head.

4) Why the correct answer is correct
- The described mechanism (eyes move opposite head movement to stabilize vision) matches the anatomy and physiology of the VOR and its purpose: preventing retinal slip and blurry vision during head motion.

5) Why other options are incorrect
- Option 1: Motion sickness involves sensory mismatch and autonomic centers, not the primary function of VOR via the thalamus.  
- Option 2: Otoliths detect linear acceleration/gravity for posture and reflexes, but that describes otolith function, not the VOR’s primary compensatory eye movements.  
- Option 3: Integration of touch and vision for balance involves somatosensory and cerebellar systems, not specifically the VOR.  
- Option 5: Eyes moving in the same direction as the head describes tracking (e.g., vestibulo-collic or smooth pursuit involvement), not the compensatory VOR.

6) Conclusion
The correct choice is: "The VOR causes the eyes to move in the opposite direction to head movement, keeping the visual scene stable and preventing blurry vision," which matches the provided answer.

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