Efficacy of tilt-suppression in postrotatory nystagmus in cats
| Autor: | Motoyoshi Maruyama, Yukio Watanabe, Hiroaki Fushiki |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
medicine.medical_specialty
Eye Movements Nystagmus Rotation Physical medicine and rehabilitation Nystagmus Physiologic Orientation Orientation (geometry) medicine Animals Postural Balance Molecular Biology Physics Vestibular system Semicircular canal General Neuroscience Brain Neural Inhibition Reflex Vestibulo-Ocular Anatomy Adaptation Physiological Illusions medicine.anatomical_structure Head Movements Cats Vertigo Vertical nystagmus Vestibule Labyrinth Neurology (clinical) Vestibulo–ocular reflex medicine.symptom Tilt (camera) Developmental Biology |
| Zdroj: | Brain Research. 1108:127-132 |
| ISSN: | 0006-8993 |
| DOI: | 10.1016/j.brainres.2006.06.010 |
| Popis: | The phenomenon of tilting the head away from an upright position immediately after a horizontal head-rotation, thus reducing the duration of postrotatory nystagmus (PRN), has more than once been called “tilt-suppression.” It represents an example of the semicircular canal–otolith interaction in the central vestibular system. In the present study we investigated how head roll-tilt influences the time constants of PRN in the horizontal and vertical planes in cats. The head/body was roll-tilted by 30° toward the upright or the side down from initial roll positions immediately after termination of earth-vertical axis (EVA) rotation. Changes in head orientation either towards or away from the EVA reduced horizontal PRN. The reducing effect was small when the head was roll-tilted toward the EVA. Vertical nystagmus decreased only when the head orientation moved toward alignment with the EVA. Otolithic “tilt-suppression” may be a central neuronal mechanism that is activated to minimize the tumbling sensation of turning about a tilted axis and postural instability, but our results indicate that tilt-suppression of PRN depends on a change in head orientation with respect to the EVA. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect