Influence of Otolith Organs, Semicircular Canals, and Neck Afferents on Post-Rotatory Nystagmus
| Autor: | Izumi Koizuka, Joseph M. Furman, R. H. Schor |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Vestibular system
Semicircular canal medicine.diagnostic_test business.industry General Neuroscience Sensory system Nystagmus Anatomy Electrooculography Somatosensory system Sensory Systems Tilt (optics) medicine.anatomical_structure Otorhinolaryngology Medicine sense organs Neurology (clinical) medicine.symptom business Otolith |
| Zdroj: | Journal of Vestibular Research. 6:319-329 |
| ISSN: | 1878-6464 0957-4271 |
| DOI: | 10.3233/ves-1996-6501 |
| Popis: | The duration of post-rotatory nystagmus is known to be shortened by head tilt, a phenomenon that has been attributed to rapid discharge of the velocity storage mechanism. The relative importance of the various sensory signals associated with post-rotatory head tilt is unknown. Using both earth-vertical axis and off-vertical axis rotation, we investigated this issue in humans by combining sudden termination of constant velocity rotation with several post-rotatory maneuvers that stimulated combinations of otolith organ, somatosensory, and vertical semicircular canal afferents. Results indicated that horizontal post-rotatory nystagmus was shortened by maneuvers that move the head from upright to off-vertical and by cessation of dynamic otolith stimuli. Somatosensory, neck afferent, and transient vestibular stimulation had no consistent effect. We conclude that tilt suppression of postrotatory nystagmus and the short time constant following off-vertical axis rotation is primarily a function of otolith influence on the velocity storage system. |
| Databáze: | OpenAIRE |
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