Document Detail

Saccade suppression by electrical microstimulation in monkey caudate nucleus.
MedLine Citation:
PMID:  20164354     Owner:  NLM     Status:  MEDLINE    
It has been suggested that the caudate nucleus, the input stage of the basal ganglia, facilitates and suppresses saccade initiation based on its anatomical characteristics. Although the involvement of the caudate nucleus in saccade facilitation has been shown previously, it is still unclear whether the caudate nucleus is also involved in saccade suppression. Here, we revealed the direct involvement of the caudate nucleus in saccade suppression by electrical microstimulation in behaving monkeys. We delivered microstimulation to the caudate nucleus while monkeys performed the prosaccade (look toward a peripheral visual stimulus) and antisaccade (look away from the stimulus) paradigm. The reaction times of contralateral saccades were prolonged on both prosaccade and antisaccade trials. The suppression effects on reaction times were stronger on prosaccade trials compared with antisaccade trials. The analysis of reaction time distributions using the linear approach to threshold with ergodic rate model (LATER model) revealed that microstimulation prolonged reaction times by reducing the rate of rise to the threshold for saccade initiation. Microstimulation also worsened correct performance rates for contralateral saccades. The same microstimulation prolonged and/or shortened the reaction times of ipsilateral saccades, although the effects were not as consistent as those on contralateral saccades. We conclude that caudate signals are sufficient to suppress contralateral saccades and influence saccadic decision by controlling contralateral and ipsilateral saccade commands at the same time.
Masayuki Watanabe; Douglas P Munoz
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of neuroscience : the official journal of the Society for Neuroscience     Volume:  30     ISSN:  1529-2401     ISO Abbreviation:  J. Neurosci.     Publication Date:  2010 Feb 
Date Detail:
Created Date:  2010-02-18     Completed Date:  2010-03-19     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8102140     Medline TA:  J Neurosci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2700-9     Citation Subset:  IM    
Centre for Neuroscience Studies, Queen's University, Kingston, Ontario K7L 3N6, Canada.
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MeSH Terms
Attention / physiology
Behavior, Animal / physiology
Caudate Nucleus / physiology*
Electric Stimulation / methods*
Fixation, Ocular / physiology*
Functional Laterality / physiology
Macaca mulatta / anatomy & histology,  physiology*
Magnetic Resonance Imaging / methods
Models, Biological
Psychomotor Performance / physiology
Reaction Time / physiology
Saccades / physiology*
Grant Support
MOP-77734//Canadian Institutes of Health Research

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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