Cited by 182Neurotransmitter Receptor Influence on BehaviorNeuropeptides and Animal PhysiologyRegulation of Appetite and Obesity

Distinct opioid circuits determine the palatability and the desirability of rewarding events

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Wassum, K. M., Ostlund, S. B., Maidment, N. T., Balleine, B. W.·2009·Proceedings of the National Academy of Sciences

Abstract

It generally is assumed that a common neural substrate mediates both the palatability and the reward value of nutritive events. However, recent evidence suggests this assumption may not be true. Whereas opioid circuitry in both the nucleus accumbens and ventral pallidum has been reported to mediate taste-reactivity responses to palatable events, the assignment of reward or inventive value to goal-directed actions has been found to involve the basolateral amygdala. Here we found that, in rats, the neural processes mediating palatability and incentive value are indeed dissociable. Naloxone infused into either the ventral pallidum or nucleus accumbens shell blocked the increase in sucrose palatability induced by an increase in food deprivation without affecting the performance of sucrose-related actions. Conversely, naloxone infused into the basolateral amygdala blocked food deprivation-induced changes in sucrose-related actions without affecting sucrose palatability. This double dissociation of opioid-mediated changes in palatability and incentive value suggests that the role of endogenous opioids in reward processing does not depend on a single neural circuit. Rather, changes in palatability and in the incentive value assigned to rewarding events seem to be mediated by distinct neural processes.

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Authors
Wassum, K. M., Ostlund, S. B., Maidment, N. T., & Balleine, B. W.
Affiliations
  • University of California, Los Angeles (US)
  • The University of Sydney (AU)
Venue
Proceedings of the National Academy of Sciences
Published
2009-07-28
Volume
106
Issue
30
Pages
12512-12517
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2025466447
Cited by
182
References
41
Citations by year
2026: 4 · 2025: 15 · 2024: 4 · 2023: 4 · 2022: 8 · 2021: 12 · 2020: 10 · 2019: 18 · 2018: 5 · 2017: 10 · 2016: 15 · 2015: 13 · 2014: 10 · 2013: 11 · 2012: 21
FWCI
5.94
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute of Mental Health (R29MH056446, MH56446, R01MH056446, T32MH017140)
  • National Institute on Drug Abuse (P50DA005010, DA05010, DA-09359, R01DA009359)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
Keywords
endogenous opioids, palatability, incentive value, reward processing, nucleus accumbens shell, ventral pallidum, basolateral amygdala, food deprivation, sucrose, taste reactivity, naloxone, double dissociation, neural circuits
MeSH terms
Animals, Feeding Behavior, Food Deprivation, Food Preferences, Globus Pallidus, Male, Naloxone, Narcotic Antagonists, Neural Pathways, Nucleus Accumbens, Receptors, Opioid, Reward, Rats, Long-Evans, Rats

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