Document Detail

Reaction time changes with the hazard rate for a behaviorally relevant event when monkeys perform a delayed wrist movement task.
MedLine Citation:
PMID:  18243554     Owner:  NLM     Status:  MEDLINE    
Anticipating the timing of behaviorally relevant events is crucial for organizing movement. The time to initiate actions based on events (i.e., reaction time (RT)) is a useful measure to quantify states of anticipation. Few studies have examined how anticipation affects the timing of limb movements. We addressed this question behaviorally with two macaque monkeys performing delayed wrist movement tasks. The interval between target onset and go signal (i.e., foreperiod) varied randomly from 1 to 2 s. The probability that the go signal was about to occur (i.e., hazard rate) increased as the foreperiod increased. The kinematics of wrist movements was not influenced by foreperiod duration. Analyzing RT data with the LATER model indicated that RT distributions swiveled on reciprobit plots as foreperiods increased, suggesting that changes in RT distributions were due to changes in anticipation. RT was inversely related to hazard rate. To better understand the general implications of anticipatory states, we introduced an additional rectangular foreperiod distribution that ranged from 0.9 to 1.5 s. For that distribution, the hazard rate peaks were higher than those of the 1-2 s distribution. Changes in RT were clearly explained by quantitative differences in hazard rate. The decrease in RT in the 0.9-1.5 s foreperiod distribution was greater than that in the 1-2 s foreperiod. Thus, monkeys learned the temporal structure of foreperiod distributions and anticipated the onset of the go signal, based on hazard rates.
Yoshiaki Tsunoda; Shinji Kakei
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-01-10
Journal Detail:
Title:  Neuroscience letters     Volume:  433     ISSN:  0304-3940     ISO Abbreviation:  Neurosci. Lett.     Publication Date:  2008 Mar 
Date Detail:
Created Date:  2008-02-29     Completed Date:  2008-06-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7600130     Medline TA:  Neurosci Lett     Country:  Ireland    
Other Details:
Languages:  eng     Pagination:  152-7     Citation Subset:  IM    
Department of Behavioral Physiology, Tokyo Metropolitan Institute for Neuroscience, 2-6 Musashi-dai, Fuchu, Tokyo 183-8526, Japan.
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MeSH Terms
Behavior, Animal
Decision Making / physiology
Discrimination (Psychology) / physiology*
Macaca fascicularis
Movement / physiology*
Photic Stimulation / methods
Reaction Time / physiology*
Time Factors
Wrist / innervation*,  physiology

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

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