Document Detail

Environmental stimuli promote the acquisition of nicotine self-administration in rats.
MedLine Citation:
PMID:  12202970     Owner:  NLM     Status:  MEDLINE    
RATIONALE: Environmental stimuli associated with drugs of abuse are believed to play a major role in the motivation to take drugs, drug dependence, and relapse. Previous work from this laboratory demonstrated that the response-contingent presentation of drug-related, visual cues was at least as important as nicotine in the maintenance, extinction and reacquisition of self-administration in experienced rats. OBJECTIVES: In the present research, we asked whether these same visual cues are effective in promoting the acquisition of operant responding in drug naive rats. METHODS: Male Sprague-Dawley rats were tested for self-administration of IV nicotine (0.03 mg/kg, free base) in 1-h daily sessions when infusions were or were not paired with two lighting events: a 1-s cue light, followed by a 1-min period during which the chamber light was turned off and responding was not reinforced. RESULTS: Rats tested with cues plus nicotine rapidly acquired self-administration and increased their lever pressing rates as the schedule progressed from FR1 to FR5. Without cues, the rate of nicotine self-administration was low and no adjustments were made in response to increasing schedule demands. While one of the stimuli, turning off the chamber light, was shown to have primary reinforcing properties, its association with nicotine produced a synergistic enhancement of lever pressing. Acquisition of operant responding was also enhanced, but to a lesser extent, by a previously neutral compound stimulus, i.e. the nicotine-paired cue light presented with a 1-s tone. CONCLUSIONS: These results illustrate a powerful interaction between environmental stimuli and nicotine in the acquisition of operant responding and indicate that both intrinsically reinforcing and previously neutral cues can participate in this effect.
Anthony R Caggiula; Eric C Donny; Anthony R White; Nadia Chaudhri; Sheri Booth; Maysa A Gharib; Alycia Hoffman; Kenneth A Perkins; Alan F Sved
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.     Date:  2002-07-13
Journal Detail:
Title:  Psychopharmacology     Volume:  163     ISSN:  0033-3158     ISO Abbreviation:  Psychopharmacology (Berl.)     Publication Date:  2002 Sep 
Date Detail:
Created Date:  2002-08-30     Completed Date:  2003-03-03     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  7608025     Medline TA:  Psychopharmacology (Berl)     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  230-7     Citation Subset:  IM    
Department of Psychology, University of Pittsburgh, 3131 Sennott Square, Pittsburgh, PA 15260, USA.
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MeSH Terms
Behavior, Addictive / psychology*
Conditioning, Operant / drug effects,  physiology
Environment, Controlled
Lighting* / methods
Nicotine / administration & dosage*
Rats, Sprague-Dawley
Self Administration / psychology
Grant Support
Reg. No./Substance:

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