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The Journal of Neurophysiology Vol. 83 No. 3 March 2000, pp. 1648-1661
Copyright ©2000 by the American Physiological Society
Department of Otolaryngology and Anatomy, University of Mississippi Medical Center, Jackson, Mississippi 39216-4505
McHenry, M. Quinn and
Dora E. Angelaki.
Primate Translational Vestibuloocular Reflexes. II. Version and
Vergence Responses to Fore-Aft Motion. J. Neurophysiol. 83: 1648-1661, 2000. To maintain binocular
fixation on near targets during fore-aft translational disturbances,
largely disjunctive eye movements are elicited the amplitude and
direction of which should be tuned to the horizontal and vertical
eccentricities of the target. The eye movements generated during this
task have been investigated here as trained rhesus monkeys fixated
isovergence targets at different horizontal and vertical eccentricities
during 10 Hz fore-aft oscillations. The elicited eye movements complied
with the geometric requirements for binocular fixation, although not ideally. First, the corresponding vergence angle for which the movement
of each eye would be compensatory was consistently less than that
dictated by the actual fixation parameters. Second, the eye position
with zero sensitivity to translation was not straight ahead, as
geometrically required, but rather exhibited a systematic dependence on
viewing distance and vergence angle. Third, responses were asymmetric,
with gains being larger for abducting and downward compared with
adducting and upward gaze directions, respectively. As frequency was
varied between 4 and 12 Hz, responses exhibited high-pass filter
properties with significant differences between abduction and adduction
responses. As a result of these differences, vergence sensitivity
increased as a function of frequency with a steeper slope than that of
version. Despite largely undercompensatory version responses, vergence
sensitivity was closer to ideal. Moreover, the observed dependence of
vergence sensitivity on vergence angle, which was varied between 2.5 and 10 MA, was largely linear rather than quadratic (as geometrically predicted). We conclude that the spatial tuning of eye velocity sensitivity as a function of gaze and viewing distance follows the
general geometric dependencies required for the maintenance of foveal
visual acuity. However, systematic deviations from ideal behavior exist
that might reflect asymmetric processing of abduction/adduction responses perhaps because of different functional dependencies of
version and vergence eye movement components during translation.
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