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

被引：0
作者：
A. H. Bell
M. A. Meredith
A. J. Van Opstal
D. P. Munoz
机构：
[1] Queen’s University,Centre for Neuroscience Studies, CIHR Group in Sensory
[2] Virginia Commonwealth University,Motor Systems, Department of Physiology
[3] Radboud University Nijmegen,Department of Anatomy
来源：
Experimental Brain Research | 2006年 / 174卷
关键词：
Superior colliculus; Visual; Express saccades; Intensity; Response onset latency;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
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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页码：53 / 59
页数：6
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