Document Detail

Integration of learned and naturally occurring flexor EMG in the human step cycle.
MedLine Citation:
PMID:  3786500     Owner:  NLM     Status:  MEDLINE    
Human locomotion, as a behavioral system, is well suited for investigating the interplay of learning with innate biological mechanisms. The present work assembled, from previous findings, a test battery of operant conditioning to modify strong ongoing electromyographic (EMG) activity of the left tibialis anterior (TA), an ankle flexor muscle. An EMG segment 100-400 msec long had to occur within 700 msec, and (in different training regimens) with filtered amplitude both above and below different thresholds--all in response to a colored light that flashed at a designated time in the step cycle. Reinforcement was a high or low tone that indicated success or failure, respectively. All four subjects met training criteria (90% success rate) at a moderate amplitude, just as had been true previously for a relatively inactive knee extensor. Subject-specific limitations were found in operant control at higher and lower amplitudes. New learning was not disruptive, although ipsilateral swing duration increased, nor was it phase-dependent on any portion of the step cycle.
M C Wetzel; R E Wetzel
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Physiology & behavior     Volume:  38     ISSN:  0031-9384     ISO Abbreviation:  Physiol. Behav.     Publication Date:  1986  
Date Detail:
Created Date:  1987-01-14     Completed Date:  1987-01-14     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0151504     Medline TA:  Physiol Behav     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  41-51     Citation Subset:  IM    
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MeSH Terms
Conditioning, Operant / physiology*
Muscles / physiology
Reaction Time
Reinforcement (Psychology)
Grant Support

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

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