Human ocular counterrolling induced by varying linear accelerations
| Autor: | B. K. Lichtenberg, Laurence R. Young, Anthony Arrott |
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| Rok vydání: | 1982 |
| Předmět: |
Eye Movements
Rotation Acceleration Models Neurological Otolithic Membrane Optics Nystagmus Physiologic Neck Muscles Orientation medicine Humans Postural Balance Otolith Physics Afferent Pathways Line-of-sight business.industry General Neuroscience Linear system Time constant Eye movement Linearity Mechanics Semicircular Canals medicine.anatomical_structure Amplitude Reflex business |
| Zdroj: | Experimental brain research. 48(1) |
| ISSN: | 0014-4819 |
| Popis: | Ocular counterrolling (OCR) has previously been studied using static head tilt or continuous rotation about the line of sight as a stimulus to the otolith organs. This study presents the first measurements of OCR in humans induced by linear accelerations. Dynamic measurements of the response to lateral linear acceleration indicate the eye movements to be on the order of 2 degrees for 0.2 g peak acceleration, 0.2 Hz sinusoidal acceleration. These values are consistent with static OCR studies. The dynamics of the response are similar to a low order linear system with a dominant time constant of 0.33 s. A previous model predicts a time constant of 0.32 s. Sinusoidal oscillation at 0.2, 0.4, and 1.0 Hz with a 0.2 g peak acceleration showed good agreement with the model in both gain and phase. The question of amplitude linearity remains unsettled. This otolithocular reflex, over short periods at least, appears to be stationary in the statistical sense. |
| Databáze: | OpenAIRE |
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