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Retinal Image Slip Must Pass the Threshold for Human Vestibulo-Ocular Reflex Adaptation
M Muntaseer Mahfuz1,2, Michael C Schubert3,4, William V C Figtree1,2
1Balance and Vision Laboratory, Neuroscience Research Australia, Cnr Barker Street & Easy Street Randwick, Sydney, NSW, 2031, Australia.
Summary
Repeated vestibulo-ocular reflex (VOR) adaptation training shows lasting effects in normal subjects. Stable vision is maintained with less than 5% VOR gain deviation, corresponding to minimal retinal image slip.
Area of Science:
- Neuroscience
- Ophthalmology
- Vestibular System
Background:
- The vestibulo-ocular reflex (VOR) stabilizes vision during head movements.
- Understanding VOR adaptation and its limits is crucial for visual stability.
Purpose of the Study:
- To investigate the lasting effects of repeated VOR adaptation training in healthy individuals.
- To determine the threshold for retinal image slip that influences VOR adaptation.
Main Methods:
- Utilized unilateral incremental VOR adaptation technique with active head impulses.
- Measured VOR gain (eye/head velocity) before and after adaptation training.
- Tested ten normal subjects over two blocks of training and testing, including a retention period.
Main Results:
- Achieved robust short-term VOR adaptation of approximately 10% after each training session.
- Observed a sustained VOR gain increase of about 5% compared to baseline after training.
- Demonstrated partial retention of VOR gain increase for 19 days post-training.
Conclusions:
- Repeated VOR adaptation training induces partially retained gains in normal subjects.
- A VOR gain deviation threshold of <5% (approx. 9°/s retinal slip) appears critical for maintaining stable vision.
- Below this threshold, adaptive drive to restore baseline VOR gain is diminished.
