Summary
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 ° 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.
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Supported by NASA Grants NSG 2032, NAG 2–88 and NAS9–15343
Recipient of a Fannie and John Hertz Foundation Fellowship for his Sc.D. studies
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Lichtenberg, B.K., Young, L.R. & Arrott, A.P. Human ocular counterrolling induced by varying linear accelerations. Exp Brain Res 48, 127–136 (1982). https://doi.org/10.1007/BF00239580
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DOI: https://doi.org/10.1007/BF00239580