Document Detail

Brief exposures to theta-burst magnetic fields impair the consolidation of food-induced conditioned place preference.
MedLine Citation:
PMID:  17365115     Owner:  NLM     Status:  MEDLINE    
Theta-burst magnetic fields (1 microT) designed to mimic electrical stimuli employed in vitro to affect long-term potentiation have been previously shown to impair the acquisition of conditioned fear. In the current study, the authors were interested in investigating whether similar magnetic fields could affect the consolidation of food-induced conditioned place preference. Fourteen male Wistar rats were exposed to a theta-burst magnetic field (1 s pulse of 5 trains of an LTP-evoking pattern) continuously or with either a 5 s or 10 s interstimulus interval for 15 min immediately following 6 daily conditioning trials (15 min/day) in a place preference apparatus. Testing demonstrated the durations in the food-paired chamber was significantly shorter for all of the magnetic field-exposed groups compared to the sham-exposed group (they remained for longer periods in the food-paired chamber, typical of normal rats). In addition, the group exposed continuously to the LTP-magnetic field (1-ms interstimulus duration) displayed the least time in the food-paired chamber. The treatments explained 80% of the variance in durations within the experimental setting. These results suggest that exposures to theta-burst magnetic fields elicit amnesic effects for contextual stimuli.
J J Delparte; M A Persinger
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The International journal of neuroscience     Volume:  117     ISSN:  0020-7454     ISO Abbreviation:  Int. J. Neurosci.     Publication Date:  2007 Feb 
Date Detail:
Created Date:  2007-03-16     Completed Date:  2007-04-24     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0270707     Medline TA:  Int J Neurosci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  295-9     Citation Subset:  IM    
Behavioral Neuroscience Laboratory, Laurentian University, Sudbury, Ontario, Canada.
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MeSH Terms
Behavior, Animal / radiation effects
Conditioning, Operant / physiology,  radiation effects*
Electromagnetic Fields / adverse effects*
Electromagnetic Phenomena / methods
Learning Disorders / etiology*,  physiopathology
Rats, Wistar
Time Factors

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

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