Document Detail

Reinforcer magnitude attenuates: apomorphine's effects on operant pecking.
MedLine Citation:
PMID:  23144505     Owner:  NLM     Status:  MEDLINE    
When given to pigeons, the direct-acting dopamine agonist apomorphine elicits pecking. The response has been likened to foraging pecking because it bears remarkable similarity to foraging behavior, and it is enhanced by food deprivation. On the other hand, other data suggest the response is not related to foraging behavior and may even interfere with food ingestion. Although elicited pecking interferes with food capture, it may selectively alter procurement phases of feeding, which can be isolated in operant preparations. To explore the relation between operant and elicited pecking, we provided pigeons the opportunity to earn different reinforcer magnitudes during experimental sessions. During signaled components, each of 4 pigeons could earn 2-, 4-, or 8-s access to grain for a single peck made at the end of a 5-min interval. In general, responding increased as a function of reinforcer magnitude. Apomorphine increased pecking for 2 pigeons and decreased pecking for the other 2. In both cases, apomorphine was more potent under the component providing the smallest reinforcer magnitude. Analysis of the pattern of pecking across the interval indicated that behavior lost its temporal organization as dose increased. Because apomorphine-induced pecking varied inversely with reinforcer magnitude, we conclude that elicited pecks are not functionally related to food procurement. The data are consistent with the literature on behavioral resistance to change and suggest that the effects of apomorphine may be modulated by prevailing stimulus-reinforcer relationships.
Jonathan W Pinkston; R J Lamb
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  Journal of the experimental analysis of behavior     Volume:  98     ISSN:  1938-3711     ISO Abbreviation:  J Exp Anal Behav     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-12     Completed Date:  2013-05-03     Revised Date:  2013-07-11    
Medline Journal Info:
Nlm Unique ID:  0203727     Medline TA:  J Exp Anal Behav     Country:  United States    
Other Details:
Languages:  eng     Pagination:  273-82     Citation Subset:  IM    
University of Texas Health Science Center at San Antonio, San Antonio, TX 76205, USA.
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MeSH Terms
Apomorphine / pharmacology*
Appetitive Behavior / drug effects
Behavior, Animal / drug effects*
Conditioning, Operant / drug effects*
Dopamine Agonists / pharmacology*
Feeding Behavior / drug effects
Reinforcement (Psychology)*
Stereotyped Behavior / drug effects
Grant Support
Reg. No./Substance:
0/Dopamine Agonists; 58-00-4/Apomorphine

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

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