Document Detail

Behavioral evidence for competing motivational drives of nociception and hunger.
MedLine Citation:
PMID:  15531083     Owner:  NLM     Status:  MEDLINE    
Homeostasis, an organisms' tendency to maintain a healthy balance of the physiological state of the body, is necessary for survival. Hunger induces a motivational state to consume food. Recently, pain has been referred to as a homeostatic emotion similar to hunger or thirst in that animals are motivated to respond in a certain way that may increase their chance of survival. Therefore, the purpose of the present experiment was to examine behavior in rodents during two competing homeostatic/motivational drives (i.e., hunger and formalin pain). During the first phase of the formalin test, animals displayed typical responsiveness to the inflammatory condition and completed fewer chains for food reinforcement as compared to the baseline session. However, during the second phase of the formalin test, animals showed decreased nociceptive behavior compared to formalin-injected animals that were not trained in the operant conditioning paradigm. During this phase, the trained animals exhibited maximal responsiveness for food reinforcement. These results demonstrate that the engagement of behaviors reflecting motivational drives to restore homeostasis depends on the intensity or degree of imbalance of the competing drives. More specifically, animals are motivated to attend to one state of imbalance at a time.
Stacey C LaGraize; Jasenka Borzan; Matthew M Rinker; James L Kopp; Perry N Fuchs
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Neuroscience letters     Volume:  372     ISSN:  0304-3940     ISO Abbreviation:  Neurosci. Lett.     Publication Date:  2004 Nov 
Date Detail:
Created Date:  2004-11-08     Completed Date:  2005-01-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7600130     Medline TA:  Neurosci Lett     Country:  Ireland    
Other Details:
Languages:  eng     Pagination:  30-4     Citation Subset:  IM    
Department of Psychology, University of Texas at Arlington, 501 South Nedderman Drive, P.O. Box 19528, Arlington, TX 76019, USA.
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MeSH Terms
Conditioning, Operant / physiology
Hunger / physiology*
Pain / physiopathology,  psychology*
Pain Measurement / methods,  psychology*
Rats, Sprague-Dawley

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