Neuronal Responses to Moving Targets in Monkey Frontal Eye Fields

Department of Neuroscience, Columbia University, and Keck-Mahoney Center for Mind and Brain, New York, New York Submitted 29 December 2007; accepted in final form 9 July 2008 Due to delays in visuomotor processing, eye movements directed toward moving targets must integrate both target position and...

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Bibliographic Details
Published in:Journal of neurophysiology 2008-09, Vol.100 (3), p.1544-1556
Main Authors: Cassanello, Carlos R, Nihalani, Abhay T, Ferrera, Vincent P
Format: Article
Language:English
Subjects:
Action Potentials - physiology
Analysis of Variance
Animals
Electric Stimulation - methods
Eye
Eye Movements - physiology
Macaca mulatta
Male
Models, Biological
Motion Perception - physiology
Neurons - physiology
Numerical Analysis, Computer-Assisted
Photic Stimulation - methods
Reaction Time - physiology
Statistics as Topic
Visual Cortex - cytology
Visual Cortex - physiology
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Summary:Department of Neuroscience, Columbia University, and Keck-Mahoney Center for Mind and Brain, New York, New York Submitted 29 December 2007; accepted in final form 9 July 2008 Due to delays in visuomotor processing, eye movements directed toward moving targets must integrate both target position and velocity to be accurate. It is unknown where and how target velocity information is incorporated into the planning of rapid (saccadic) eye movements. We recorded the activity of neurons in frontal eye fields (FEFs) while monkeys made saccades to stationary and moving targets. A substantial fraction of FEF neurons was found to encode not only the initial position of a moving target, but the metrics (amplitude and direction) of the saccade needed to intercept the target. Many neurons also encoded target velocity in a nearly linear manner. The quasi-linear dependence of firing rate on target velocity means that the neuronal response can be directly read out to compute the future position of a target moving with constant velocity. This is demonstrated using a quantitative model in which saccade amplitude is encoded in the population response of neurons tuned to retinal target position and modulated by target velocity. Address for reprint requests and other correspondence: C. R. Cassanello, Department of Psychology, Australian National University, Canberrra, ACT 0200, Australia (E-mail: Carlos.Cassanello{at}anu.edu.au )
ISSN:0022-3077
1522-1598
DOI:10.1152/jn.01401.2007