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Eye-head coordination during head-unrestrained gaze shifts in rhesus monkeys.
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… Expand
Combined eye-head gaze shifts produced by electrical stimulation of the superior colliculus in rhesus monkeys.
1. We electrically stimulated the intermediate and deep layers of the superior colliculus (SC) in two rhesus macaques free to move their heads both vertically and horizontally (head unrestrained).… Expand
Activity of cells in the deeper layers of the superior colliculus of the rhesus monkey: evidence for a gaze displacement command.
When the head is free to move, microstimulation of the primate superior colliculus (SC) evokes coordinated movements of the eyes and head. The similarity between these stimulation-induced movements… Expand
Site and parameters of microstimulation: evidence for independent effects on the properties of saccades evoked from the primate superior colliculus.
1. Microstimulation is used to investigate how activity in the superior colliculus (SC) contributes to determining the properties of primate saccadic eye movements. The site of collicular… Expand
Coordination of the eyes and head during visual orienting
- E. Freedman
- Medicine, Psychology
- Experimental Brain Research
- 13 August 2008
Changing the direction of the line of sight is essential for the visual exploration of our environment. When the head does not move, re-orientation of the visual axis is accomplished with high… Expand
Coordination of the eyes and head: movement kinematics
Abstract. When the head is restrained, saccades are characterized by lawful relationships between movement amplitude, peak velocity, and duration. In addition, the spatiotemporal progression of… Expand
Interactions between eye and head control signals can account for movement kinematics
- E. Freedman
- Computer Science, Medicine
- Biological Cybernetics
- 11 May 2001
Abstract. Advances in understanding the neural control of saccades (visual orienting movements made when the head is prevented from moving) stem largely from early modeling efforts which provided a… Expand
Cortical and subcortical contributions to coordinated eye and head movements
This paper summarizes recent experiments conducted by the authors - experiments that studied the behavioral characteristics of large gaze shifts and the neural bases of coordinated movements of the… Expand
Ingestive behaviour and physiology of the medicinal leech.
- C. Lent, K. Fliegner, E. Freedman, M. Dickinson
- Biology, Medicine
- The Journal of experimental biology
- 1 July 1988
Ingestion lasts 25 min in Hirudo medicinalis and is characterized by pharyngeal peristalsis which fills the crop. This peristalsis has an initial rate of 2.4 Hz which decays smoothly to 1.2 Hz at… Expand
Apparent dissociation between saccadic eye movements and the firing patterns of premotor neurons and motoneurons.
- L. Ling, A. Fuchs, J. Phillips, E. Freedman
- Psychology, Medicine
- Journal of neurophysiology
- 1 November 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… Expand