Document Detail

Spontaneous motor activity in fetal and infant rats is organized into discrete multilimb bouts.
MedLine Citation:
PMID:  10832794     Owner:  NLM     Status:  MEDLINE    
Spontaneous motor activity (SMA) is a ubiquitous feature of fetal and infant behavior. Although SMA appears random, successive limb movements often occur in bouts. Bout organization was evident at all ages in fetal (embryonic day [E] 17-21) and infant (postnatal day [P] 1-9) rats, with nearly all bouts comprising 1-4 movements of different limbs. A computational model of SMA, including spontaneous activity of spinal motor neurons, intrasegmental and intersegmental interactions, recurrent inhibition, and descending influences, produced bouts with the same structure as that observed in perinatal rats. Consistent with the model, bouts were not eliminated on E20 after cervical spinal transection, suggesting that the brain is not necessary to produce bout organization. These investigations provide a foundation for understanding the contributions of SMA to neuromuscular and motor development.
S R Robinson; M S Blumberg; M S Lane; L A Kreber
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Behavioral neuroscience     Volume:  114     ISSN:  0735-7044     ISO Abbreviation:  Behav. Neurosci.     Publication Date:  2000 Apr 
Date Detail:
Created Date:  2000-10-02     Completed Date:  2000-10-02     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8302411     Medline TA:  Behav Neurosci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  328-36     Citation Subset:  IM    
Department of Psychology, University of Iowa, Iowa City 52242, USA.
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MeSH Terms
Animals, Newborn / physiology*
Fetal Movement / physiology*
Motor Activity / physiology*
Motor Neurons / physiology
Neuromuscular Junction / embryology,  physiology
Rats, Sprague-Dawley
Spinal Cord / embryology,  physiology
Grant Support

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