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Department of Medical Physics and Biophysics,

By Joyce Vliegen, Tom J. Van Grootel, A. John and Van Opstal

Abstract

JN-00027-2005.R2 1 Visual stimuli are initially represented in a retinotopic reference frame. To maintain spatial accuracy of gaze (i.e. eye in space) despite intervening eye and head movements, the visual input could be combined with dynamic feedback about ongoing gaze shifts. Alternatively, target coordinates could be updated in advance by using the preprogrammed gaze-motor command ('predictive remapping'). So far, previous experiments have not dissociated these possibilities. Here we study whether the visuomotor system accounts for saccadic eye-head movements that occur during target presentation. In this case, the system has to deal with fast dynamic changes of the retinal input, and with highly variable changes in relative eye and head movements that cannot be preprogrammed by the gaze control system. We performed visual-visual double-step experiments in which a brief (50 ms) stimulus was presented during a saccadic eye-head gaze shift toward a previously flashed visual target. Our results show that gaze shifts remain accurate under these dynamic conditions, even fo

Year: 2009
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