Document Detail

Wipe and flexion withdrawal reflexes display different EMG patterns prior to movement onset in the spinalized frog.
MedLine Citation:
PMID:  2612608     Owner:  NLM     Status:  MEDLINE    
We investigated the hypotheses (1) that the initial flexion part of the wipe reflex elicited in the spinalized frog has the same EMG pattern for wipes to different target locations (Berkinblit et al. 1986), thereby reducing the complexity of the control of this task, and (2) that this initial flexion is the same as occurs in the flexion withdrawal reflex (Easton 1972). The activities of seven muscles of the hindlimb of the spinal frog were recorded via intramuscular electromyograms (EMGs) during the wipe reflex to two target locations and during the flexion withdrawal reflex. The EMGs were analyzed during the interval between stimulus placement and movement onset for mean integrated EMG and duration from EMG onset to movement onset. This analysis revealed significant differences (p less than 0.0001) in the EMG patterns that preceded the initial flexion posture for all three movements. These findings suggest that the spinal circuitry coordinating the initial flexion part of the wipe reflex to different target locations and the flexion withdrawal reflex may not be uniformly shared.
J L Schotland; W A Lee; W Z Rymer
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Experimental brain research     Volume:  78     ISSN:  0014-4819     ISO Abbreviation:  Exp Brain Res     Publication Date:  1989  
Date Detail:
Created Date:  1990-03-01     Completed Date:  1990-03-01     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  649-53     Citation Subset:  IM    
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MeSH Terms
Decerebrate State
Hindlimb / physiology*
Muscles / physiology*
Rana catesbeiana / physiology*
Reflex / physiology*
Grant Support

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