Eye-Head Coordination During Head-Unrestrained Gaze Shifts in Rhesus Monkeys
| Autor: | David L. Sparks, Edward G. Freedman |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Superior Colliculi
medicine.medical_specialty genetic structures Physiology Head (linguistics) Audiology Brain mapping Orientation Saccades medicine Animals Attention Visual Pathways Brain Mapping Communication business.industry General Neuroscience Macaca mulatta Gaze eye diseases Head Movements Female sense organs Psychology business Psychomotor Performance |
| Zdroj: | Journal of Neurophysiology. 77:2328-2348 |
| ISSN: | 1522-1598 0022-3077 |
| DOI: | 10.1152/jn.1997.77.5.2328 |
| Popis: | Freedman, Edward G. and David L. Sparks. Eye-head coordination during head-unrestrained gaze shifts in rhesus monkeys. J. Neurophysiol. 77: 2328–2348, 1997. 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 (200°/s and head velocity increased by 100°/s. For constant-amplitude eye movements (∼30°), eye velocity declined as the velocity of the concurrent head movement increased. On the basis of these relationships, it is possible to accurately predict gaze amplitude, the amplitudes of the eye and head components of the gaze shift, and gaze, eye, and head velocities, durations and latencies if the two-dimensional displacement of the target and the initial position of the eyes in the orbits are known. These data indicate that signals related to the initial positions of the eyes in the orbits and the direction of the gaze shift influence separate eye and head movement commands. The hypothesis that this divergence of eye and head commands occurs downstream from the superior colliculus is supported by recent electrical stimulation and single-unit recording data. |
| Databáze: | OpenAIRE |
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