Time course of oculomotor inhibition revealed by saccade trajectory modulation

Journal of Neurophysiology
Eugene McSorleyRobin Walker

Abstract

Selecting a stimulus as the target for a goal-directed movement involves inhibiting other competing possible responses. Both target and distractor stimuli activate populations of neurons in topographic oculomotor maps such as the superior colliculus. Local inhibitory interconnections between these populations ensure only one saccade target is selected. Suppressing saccades to distractors may additionally involve inhibiting corresponding map regions to bias the local competition. Behavioral evidence of these inhibitory processes comes from the effects of distractors on oculomotor and manual trajectories. Individual saccades may initially deviate either toward or away from a distractor, but the source of this variability has not been investigated. Here we investigate the relation between distractor-related deviation of trajectory and saccade latency. Targets were presented with, or without, distractors, and the deviation of saccade trajectories arising from the presence of distractors was measured. A fixation gap paradigm was used to manipulate latency independently of the influence of competing distractors. Shorter-latency saccades deviated toward distractors and longer-latency saccades deviated away from distractors. The transi...Continue Reading

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Citations

Nov 27, 2008·Experimental Brain Research·Alice G Cruickshank, Eugene McSorley
Aug 1, 2009·Experimental Brain Research·Eugene McSorley, Rachel McCloy
Oct 24, 2009·Experimental Brain Research·Karen Lucia CampbellLynn Hasher
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Dec 29, 2010·Experimental Brain Research·Sabine BornJan Theeuwes
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Sep 7, 2012·PloS One·Zhiguo Wang, Jan Theeuwes
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Oct 29, 2009·Vision Research·Frouke HermensRobin Walker
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Oct 7, 2006·Acta Psychologica·Stefan Van der StigchelJan Theeuwes
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May 5, 2012·Vision Research·Kalina Petrova, Dirk Wentura
Jun 9, 2009·Vision Research·Stefan Van der StigchelJan Theeuwes

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