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

Author:

Ling Leo12,Fuchs Albert F.12,Phillips James O.13,Freedman Edward G.12

Affiliation:

1. Regional Primate Research Center,

2. Department of Physiology and Biophysics, and

3. Department of Otolaryngology HNS, University of Washington, Seattle, Washington 98195

Abstract

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.

Publisher

American Physiological Society

Subject

Physiology,General Neuroscience

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