Eye-head coordination during head-unrestrained gaze shifts in rhesus monkeys

Journal of Neurophysiology
Edward G Freedman, D L Sparks

Abstract

We analyzed gaze shifts made by trained rhesus monkeys with completely unrestrained heads during performance of a delayed gaze shift task. Subjects made horizontal, vertical, and oblique gaze shifts to visual targets. We found that coordinated eye-head movements are characterized by a set of lawful relationships, and that the initial position of the eyes in the orbits and the direction of the gaze shift are two factors that influence these relationships. Head movements did not contribute to the change in gaze position during small gaze shifts (<20 degrees) directed along the horizontal meridian, when the eyes were initially centered in the orbits. For larger gaze shifts (25-90 degrees), the head contribution to the gaze shift increased linearly with increasing gaze shift amplitude, and eye movement amplitude saturated at an asymptotic amplitude of approximately 35 degrees. When the eyes began deviated in the orbits contralateral to the direction of the ensuing gaze shift, the head contributed less and the eyes more to amplitude-matched gaze shifts. The relative timing of eye and head movements was altered by initial eye position; head latency relative to gaze onset increased as the eyes began in more contralateral initial posit...Continue Reading

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Citations

May 23, 2001·Nature Neuroscience·E M KlierJ D Crawford
Feb 5, 2002·Journal of Neurophysiology·Alexander S Dubrovsky, Kathleen E Cullen
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