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Gaze Stabilization in Six Degrees of Freedom During Natural Movements

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Abstract

The purpose of the vestibulo-ocular reflex (VOR) is to stabilize images on the retina during movement. A common, idealized concept of the angular VOR is that is generates ocular rotational eye velocity equal and opposite that of the head, so that angular gaze velocity in space remains near zero. Thus, in most prior studies, results are stated in terms of gain of the VOR, defined as compensatory angular eye velocity divided by the angular head velocity. A gain of unity in this simplification would perfectly stabilize gaze. The implicit assumption, however, is that head motion consists only of rotation of the orbit without translation. We show here that this assumption is generally quite erroneous, since significant orbital translation is an intrinsic concomitant to the incidental head rotations resulting from natural activities. Further, these disturbances of gaze stability consist of integrated movement patterns in all six degrees of freedom.

© 1997 Optical Society of America

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