Brain stem omnipause neurons and the control of combined eye-head gaze saccades in the alert cat

Journal of Neurophysiology
M Paré, D Guitton

Abstract

When the head is unrestrained, rapid displacements of the visual axis-gaze shifts (eye-re-space)-are made by coordinated movements of the eyes (eye-re-head) and head (head-re-space). To address the problem of the neural control of gaze shifts, we studied and contrasted the discharges of omnipause neurons (OPNs) during a variety of combined eye-head gaze shifts and head-fixed eye saccades executed by alert cats. OPNs discharged tonically during intersaccadic intervals and at a reduced level during slow perisaccadic gaze movements sometimes accompanying saccades. Their activity ceased for the duration of the saccadic gaze shifts the animal executed, either by head-fixed eye saccades alone or by combined eye-head movements. This was true for all types of gaze shifts studied: active movements to visual targets; passive movements induced by whole-body rotation or by head rotation about stationary body; and electrically evoked movements by stimulation of the caudal part of the superior colliculus (SC), a central structure for gaze control. For combined eye-head gaze shifts, the OPN pause was therefore not correlated to the eye-in-head trajectory. For instance, in active gaze movements, the end of the pause was better correlated with ...Continue Reading

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Citations

Apr 14, 1999·Journal of Neurophysiology·J D CrawfordD Guitton
Aug 28, 1999·The Journal of Comparative Neurology·D Guitton
Oct 10, 2003·Journal of Neurophysiology·Julio C Martinez-TrujilloJ Douglas Crawford
Oct 22, 2010·The Journal of Comparative Neurology·Alexej GrantynNicole Quenech'du
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Mar 14, 2021·Journal of Computational Neuroscience·Jeffrey D Schall, Martin Paré
Jun 14, 2006·Physiology & Behavior·Nino DevidzeDonald W Pfaff

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