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Vision Research 41 (2001) 32153228 Direction of heading and vestibular control of binocular eye

Summary: Vision Research 41 (2001) 32153228
Direction of heading and vestibular control of binocular eye
Dora E. Angelaki a,
*, Bernhard J.M. Hess b
Department of Anatomy and Neurobiology, Box 8108, Washington Uni6ersity School of Medicine, 660 South Euclid A6enue, St Louis,
MO 63110, USA
Department of Neurology, Uni6ersity Hospital Zurich, Zurich, Switzerland
Received 5 September 2000; received in revised form 15 November 2000
To optimize visual fixation on near targets against translational disturbances, the eyes must move in compliance with
geometrical constraints that are related to the distance as well as the speed and direction relative to the target. It is often assumed
that the oculomotor system uses the vestibular signals during such movements mainly to stabilize the foveal image irrespective of
the peripheral vision. To test this hypothesis, trained rhesus monkeys were asked to maintain fixation on isovergence targets at
different horizontal eccentricities during 10 Hz oscillations along different horizontal directions. We found that the two eyes
moved in compliance with the geometrical constraints of the gaze-stabilization hypothesis, although response gains were generally
small ( 0.5). The best agreement with the gaze stabilization hypothesis occurred for heading directions within 930 from
straight-ahead, whereas lateral movements exhibited greater variability and larger directional errors that reflected the statistical


Source: Angelaki, Dora - Department of Anatomy and Neurobiology, Washington University in St. Louis


Collections: Biology and Medicine