Postprint version. Published in Human Movement Science, Volume 26, Issue 6, December 1, 2007, pages 787-795.
Copyright © 2007 Elsevier.
NOTE: At the time of publication, the author Jason A. Williams was not yet affiliated with Cal Poly.
The definitive version is available at http://dx.doi.org/10.1016/j.humov.2007.06.002.
Long-term rotational vestibulo-ocular (VOR) adaptation occurs during systematic dysmetria between visual and vestibular afferents, adjusting eye-rotation angular velocity to re-establish retinal stability of the visual field. Due to translational motion of the eyes during head rotation, VOR gain is higher when fixating near objects. The current study measures VOR in humans before and after 6min of exposure to a foveal near-target during sinusoidal whole-body rotation at 0.45 Hz. All of six participants showed post-exposure increases in open-loop VOR gain after fixating near targets, demonstrating a mean modulation increase of open-loop VOR gain from 0.86 before adaptation to 1.2 after adaptation. We discuss a number of theoretical and applied implications.