Document Detail

Short-latency afferent inhibition during selective finger movement.
MedLine Citation:
PMID:  16284755     Owner:  NLM     Status:  MEDLINE    
During individual finger movement, two opposite phenomena occur at the level of the central nervous system that could affect other intrinsic hand muscle representations, unintentional co-activation, and surround inhibition (SI). At rest, excitability in the motor cortex (M1) is inhibited at about 20 ms after electric stimulation of a peripheral nerve [short-latency afferent inhibition (SAI)]. We sought to determine whether SAI changes during selective index finger movement. Effects were measured by the response to transcranial magnetic stimulation in two functionally distinct target muscles of the hand [abductor digiti minimi muscle (ADM), first dorsal interosseus muscle (FDI)]. An increase in SAI in the ADM during index finger movement compared to at rest could help explain the genesis of SI. Electrical stimulation was applied to either the little finger (homotopic for ADM, heterotopic for FDI) or the index finger (heterotopic for ADM, homotopic for FDI). During index finger movement, homotopic SAI was present only in the ADM, and the effect of peripheral stimulation was greater when there was less co-activation. Heterotopic SAI found at rest disappeared with movement. We conclude that during movement, homotopic SAI on the muscle in the surround of the intended movement may contribute to SI.
Bernhard Voller; Alan St Clair Gibson; James Dambrosia; Sarah Pirio Richardson; Mikhail Lomarev; Nguyet Dang; Mark Hallett
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-11-12
Journal Detail:
Title:  Experimental brain research     Volume:  169     ISSN:  1432-1106     ISO Abbreviation:  Exp Brain Res     Publication Date:  2006 Feb 
Date Detail:
Created Date:  2006-02-09     Completed Date:  2008-05-08     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  226-31     Citation Subset:  IM    
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MeSH Terms
Afferent Pathways
Analysis of Variance
Electric Stimulation / methods
Evoked Potentials, Motor / physiology
Middle Aged
Movement / physiology*
Neural Inhibition / physiology*
Pyramidal Tracts / physiology
Reaction Time / physiology*
Skin / innervation
Transcranial Magnetic Stimulation / methods

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

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