Document Detail

Light stimulus change evokes an activity response in the rat.
MedLine Citation:
PMID:  15672825     Owner:  NLM     Status:  MEDLINE    
Bright light may be a danger signal for rats because they are more vulnerable to predators in bright environments. We examined the fear-evoking properties of bright light with a novel open-field procedure that confronts a rat with the sudden onset or termination of a bright light gradient. The rats did not freeze but exhibited a transient increase in locomotion to light onset and termination, which we call the activity response (AR). This finding suggests that the AR is an exploratory response geared at investigating stimulus change. The rats also displayed a preference for dark to the lighting differential that was not due to the novelty or slight heating differential supplied by the lamps. These experiments demonstrate that the sudden onset of bright light engages preencounter defensive behavior, as described by the predatory imminence model (Fanselow & Lester, 1988). This task is amenable to studying light-evoked defensive responses.
Bill P Godsil; Michael S Fanselow
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Learning & behavior     Volume:  32     ISSN:  1543-4494     ISO Abbreviation:  Learn Behav     Publication Date:  2004 Aug 
Date Detail:
Created Date:  2005-01-27     Completed Date:  2005-02-09     Revised Date:  2011-01-24    
Medline Journal Info:
Nlm Unique ID:  101155056     Medline TA:  Learn Behav     Country:  United States    
Other Details:
Languages:  eng     Pagination:  299-310     Citation Subset:  IM    
University of California, Los Angeles, California 90095, USA.
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MeSH Terms
Avoidance Learning
Exploratory Behavior*
Hot Temperature
Predatory Behavior
Rats, Long-Evans
Grant Support

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