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J Neurophysiol 82: 2808-2811, 1999;
0022-3077/99 $5.00
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The Journal of Neurophysiology Vol. 82 No. 5 November 1999, pp. 2808-2811
Copyright ©1999 by the American Physiological Society

RAPID COMMUNICATION

Apparent Dissociation Between Saccadic Eye Movements and the Firing Patterns of Premotor Neurons and Motoneurons

Leo Ling,1,2 Albert F. Fuchs,1,2 James O. Phillips,1,3 and Edward G. Freedman1,2

 1Regional Primate Research Center,  2Department of Physiology and Biophysics, and  3Department of Otolaryngology HNS, University of Washington, Seattle, Washington 98195

Ling, Leo, Albert F. Fuchs, James O. Phillips, and Edward G. Freedman. Apparent Dissociation Between Saccadic Eye Movements and the Firing Patterns of Premotor Neurons and Motoneurons. J. Neurophysiol. 82: 2808-2811, 1999. Saccadic eye movements result from high-frequency bursts of activity in ocular motoneurons. This phasic activity originates in premotor burst neurons. When the head is restrained, the number of action potentials in the bursts of burst neurons and motoneurons increases linearly with eye movement amplitude. However, when the head is unrestrained, the number of action potentials now increase as a function of the change in the direction of the line of sight during eye movements of relatively similar amplitudes. These data suggest an apparent uncoupling of premotor neuron and motoneuron activity from the resultant eye movement.




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