Sensory Interactions for Human Balance Control Revealed by Galvanic Vestibular Stimulation
Many types of sensory information are known to contribute to the human balance control process but little is known about how the different sensory channels interact. Here we consider the postural response to a perturbation delivered to the vestibular channel using galvanic vestibular stimulation. We show that the response is modified by the absence of information in the other sensory channels. Removal of somatosensory information leads to a massive increase in response size. Similarly, removal of visual information augments the response. Furthermore, the response size is graded according to the amount of visual information available. These effects occur through two processes. One that influences the developing response through feedback mechanisms and another that influences the initial response selection through gain changes. The latter is described as a competitive process that can be likened to a proportional representation voting system.
KeywordsPostural Response Experimental Brain Research Galvanic Vestibular Stimulation Sensory Channel Somatosensory Information
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- Coates, A. C., 1973, Effect of varying stimulus parameters on the galvanic body-sway responseAnnals of Otology Rhinology and Laryngology82, 96–102.Google Scholar
- Cole, J., 1995Pride and a daily marathonThe MIT Press, Boston, Mass.Google Scholar
- Coupon, J. H., Precht, W., and Sirkin, D. W., 1987, Vestibular nerve and nuclei unit responses and eye movement responses to repetitive galvanic stimulation of the labyrinth in the ratExperimental Brain Research66, 41–48.Google Scholar
- Eklund, G., 1972, General features of vibration-induced effects on balanceUpsala Journal of Medical Science 77112–124.Google Scholar
- Hiyashi, R., Miyake, A., Jijiwa, H., and Watanabe, S., 1981, Postural readjustment to body sway induced by vibration inman Experimental Brain Research43, 217–225.Google Scholar
- Smetanin, B. N., Popov, K. E., and Shlykov, V. Yu., 1990, Changes in vestibular postural response determined by information content of visual feedbackNeirofiziologiya22, 80–87.Google Scholar