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The underrated role of the “move system” in determining saccade latency

Published online by Cambridge University Press:  01 August 1999

Michael C. Dorris
Affiliation:
Medical Research Council Group in Sensory-Motor Neuroscience, Department of Physiology, Queen's University, Kingston, Ontario, Canada K7L 3N6 {mike; doug}@eyeml.queensu.ca brain.phgy.queensu.ca/doug_munoz/dpm.htm
Douglas P. Munoz
Affiliation:
Medical Research Council Group in Sensory-Motor Neuroscience, Department of Physiology, Queen's University, Kingston, Ontario, Canada K7L 3N6 {mike; doug}@eyeml.queensu.ca brain.phgy.queensu.ca/doug_munoz/dpm.htm

Abstract

The Findlay & Walker target article emphasizes the role of the target-nonspecific “fixate” system while downplaying the role of the target-specific “move” system in determining saccade latency. We agree that disengagement of the fixate system is responsible for the target-nonspecific latency reduction associated with the gap effect. However, high target predictability and extensive training at a target location can also result in latency reductions, the culmination of this being express saccades. The target-specificity associated with the latter forms of latency reduction implicate a mechanism involving the move system. Recently discovered neurophysiological correlates underlying these behavioural phenomena reside in the superior colliculus.

Type
Open Peer Commentary
Copyright
© 1999 Cambridge University Press

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