Document Detail

Behavioral changes in fetal sheep caused by vibroacoustic stimulation: the effects of cochlear ablation.
MedLine Citation:
PMID:  2035577     Owner:  NLM     Status:  MEDLINE    
We measured the effects of 2 minutes of vibroacoustic stimulation on the activity of unanesthetized fetal sheep in utero. We were unable to detect any changes in activity after stimulation with a model 5C electrolarynx. With more powerful stimulation using a mechanical oscillator, fetal electrocortical activity desynchronized. Fetal breathing and eye movements changed with electrocortical activity and there was an increase in nuchal muscle activity. Stimulation caused a small decrease in fetal heart rate. Responses to stimulation were not seen in four of the five fetuses with bilateral cochlear ablation. These results indicate that in fetal sheep the auditory apparatus is necessary for the detection of vibroacoustic stimuli. The difference in responsiveness of the sheep and human fetus appears to be because of a difference in central processing after detection of the stimulus.
M J Parkes; P J Moore; D R Moore; N M Fisk; M A Hanson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American journal of obstetrics and gynecology     Volume:  164     ISSN:  0002-9378     ISO Abbreviation:  Am. J. Obstet. Gynecol.     Publication Date:  1991 May 
Date Detail:
Created Date:  1991-06-21     Completed Date:  1991-06-21     Revised Date:  2010-08-25    
Medline Journal Info:
Nlm Unique ID:  0370476     Medline TA:  Am J Obstet Gynecol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1336-43     Citation Subset:  AIM; IM    
Department of Physiology and Biochemistry, University of Reading, England.
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MeSH Terms
Acoustic Stimulation*
Behavior, Animal*
Cochlea / physiology*
Eye Movements
Heart Rate
Motor Activity
Grant Support
//Wellcome Trust

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