Stimulus intensity modifies saccadic reaction time and visual response latency in the superior colliculus

Experimental Brain Research
Andrew H BellD P Munoz

Abstract

Performance in a reaction time task can be strongly influenced by the physical properties of the stimuli used (e.g., position and intensity). The reduction in reaction time observed with higher-intensity visual stimuli has been suggested to arise from reduced processing time along the visual pathway. If this hypothesis is correct, activity should be registered in neurons sooner for higher-intensity stimuli. We evaluated this hypothesis by measuring the onset of neural activity in the intermediate layers of the superior colliculus while monkeys generated saccades to high or low-intensity visual stimuli. When stimulus intensity was high, the response onset latency was significantly reduced compared to low-intensity stimuli. As a result, the minimum time for visually triggered saccades was reduced, accounting for the shorter saccadic reaction times (SRTs) observed following high-intensity stimuli. Our results establish a link between changes in neural activity related to stimulus intensity and changes to SRTs, which supports the hypothesis that shorter SRTs with higher-intensity stimuli are due to reduced processing time.

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Citations

Jul 7, 2009·Experimental Brain Research·Robert A Marino, Douglas Perry Munoz
Apr 5, 2013·Experimental Brain Research·Leigh A Mrotek
Oct 29, 2010·Proceedings. Biological Sciences·Jac BillingtonJohn P Wann
May 16, 2008·Journal of Neurophysiology·Aline BompasPetroc Sumner
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Dec 18, 2009·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Liping YuBenjamin A Rowland
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May 6, 2009·Neurobiology of Aging·A PeltschD P Munoz
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Nov 26, 2010·The European Journal of Neuroscience·Brendan B Chapman, Brian D Corneil
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