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Somatosensory input influences the vestibulo-ocular reflex
Akemi Sugita-Kitajima1, Izumi Koizuka
1Department of Otolaryngology, St. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ku, Kawasaki, Kanagawa 216-8511, Japan. akemiffy@bk2.so-net.ne.jp
Neuroscience Letters
|August 8, 2009
Summary
Somatosensory input, like arm movement, significantly boosts the vestibulo-ocular reflex (VOR) at low frequencies. This finding suggests new approaches for vestibular rehabilitation using sensory stimulation.
Area of Science:
- Neuroscience
- Vestibular System
- Human Physiology
Background:
- The vestibulo-ocular reflex (VOR) stabilizes gaze during head movements.
- The role of somatosensory input in modulating VOR is not fully understood.
Purpose of the Study:
- To investigate how somatosensory input influences the vestibulo-ocular reflex (VOR).
- To explore the potential of somatosensory stimulation in vestibular rehabilitation.
Main Methods:
- 19 healthy volunteers underwent sinusoidal rotation tests at varying frequencies (0.2, 0.4, 0.8 Hz) on an earth-vertical axis.
- Subjects experienced conditions with and without grasping an earth-fixed bar to introduce somatosensory (arthrokinetic) input.
- VOR gain changes were measured and compared between conditions.
Main Results:
- A significant 34% increase in VOR gain change was observed at 0.2 Hz when subjects grasped the bar.
- No significant differences in VOR gain change were found at higher frequencies (0.4, 0.8 Hz).
- Arthrokinetic input from arm movement appears to enhance VOR, particularly at low frequencies.
Conclusions:
- Somatosensory input, specifically arthrokinetic input from arm movement, can significantly enhance the vestibulo-ocular reflex at low frequencies.
- This enhancement may involve the velocity storage system, suggesting a low-frequency specific mechanism.
- Findings support the integration of somatosensory stimulation in vestibular rehabilitation strategies.
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