Microstimulation of the monkey superior colliculus induces pupil dilation without evoking saccades

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題名:	Microstimulation of the monkey superior colliculus induces pupil dilation without evoking saccades
作者:	汪勁安;Wang, Chin-An;Boehnke, Susan E.;White, Brian J.;Munoz, Douglas P.
貢獻者:	生醫理工學院認知神經科學研究所
關鍵詞:	Animals;Electric Stimulation - instrumentation;Electric Stimulation - methods;Evoked Potentials, Visual - physiology;Haplorhini;Macaca mulatta;Male;Microelectrodes;Photic Stimulation - methods;Pupil - physiology;Saccades - physiology;Superior Colliculi - physiology
日期:	2012-03-14
上傳時間:	2026-04-23 14:29:20 (UTC+8)
出版者:	Society for Neuroscience;United States: Society for Neuroscience
摘要:	摘要： The orienting reflex is initiated by a salient stimulus and facilitates quick, appropriate action. It involves a rapid shift of the eyes, head, and attention and other physiological responses such as changes in heart rate and transient pupil dilation. The SC is a critical structure in the midbrain that selects incoming stimuli based on saliency and relevance to coordinate orienting behaviors, particularly gaze shifts, but its causal role in pupil dilation remains poorly understood in mammals. Here, we examined the role of the primate SC in the control of pupil dynamics. While requiring monkeys to keep their gaze fixed, we delivered weak electrical microstimulation to the SC, so that saccadic eye movements were not evoked. Pupil size increased transiently after microstimulation of the intermediate SC layers (SCi) and the size of evoked pupil dilation was larger on a dim versus bright background. In contrast, microstimulation of the superficial SC layers did not cause pupil dilation. Thus, the SCi is directly involved not only in shifts of gaze and attention, but also in pupil dilation as part of the orienting reflex, and the function of pupil dilation may be related to increasing visual sensitivity. The shared neural mechanisms suggest that pupil dilation may be associated with covert attention. 其他題名： J Neurosci 出版者： United States: Society for Neuroscience 出版日期： 2012-03-14 出處： The Journal of Neuroscience, 2012-03, Vol.32 (11), p.3629-3636 版權： Copyright © 2012 the authors 0270-6474/12/323629-08$15.00/0 2012 識別號： ISSN: 0270-6474 識別號： ISSN: 1529-2401 識別號： EISSN: 1529-2401 識別號： DOI: 10.1523/jneurosci.5512-11.2012 識別號： PMID: 22423086
顯示於類別:	[認知與神經科學研究所 ] 期刊論文

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