Cited by 126Memory and Neural MechanismsNeural and Behavioral Psychology StudiesNeurotransmitter Receptor Influence on Behavior

GABAA-Mediated Inhibition of Basolateral Amygdala Blocks Reward Devaluation in Macaques

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Wellman, Laurie L., Gale, Karen, Malkova, Ludise·2005·The Journal of Neuroscience

Abstract

Amygdala ablation disrupts reinforcer “devaluation” in monkeys (Malkova et al., 1997). Here, we tested the hypothesis that transient inactivation of amygdala by the GABA A agonist muscimol (MUS), specifically during the period of reward satiation, would have a similar effect. Six pigtail macaques were trained on a visual object discrimination task in which 60 objects were associated with one of two specific food rewards. Subsequently, we evaluated the selective satiation-induced change (devaluation) in object preference in probe sessions. We also examined the effect of the amygdala inactivation during the probe sessions to determine whether the inactivation limited to the testing period (and not during the satiation period) is sufficient to impair the expression of reinforcer devaluation. MUS infusions were aimed at basolateral amygdala (BLA) in a pseudorandomized design; each monkey received MUS or saline either before or after selective satiation with each of the two food rewards (six infusions total). Under the control (saline) condition, the monkeys significantly shifted their preference from objects representing the sated food rewards to those representing the nonsated rewards (30% change). When BLA was inactivated during selective satiation (i.e., MUS infused before satiation), this devaluation effect was blocked. In contrast, MUS infusion after satiation, so that it was present just during the testing period, did not impair the shift in object preference (27% change). Thus, BLA is necessary for the appropriate registration of the change in the reinforcer value but not for the subsequent expression of the devaluation involving its transfer to secondary reinforcers.

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Crossref · 10.1523/jneurosci.2257-04.2005

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  1. Pribram KH (1986) The hippocampus system and recombinant processing. In: The hippocampus, Vol 4 (Isaacson RL, Pribram KH, eds), pp 329 -370. New York: Plenum.

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Authors
Wellman, L. L., Gale, K., & Malkova, L.
Affiliations
Georgetown University (US)
Venue
The Journal of Neuroscience
Published
2005-05-04
Volume
25
Issue
18
Pages
4577-4586
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2033299431
Cited by
126
References
53
Citations by year
2026: 1 · 2025: 2 · 2024: 2 · 2023: 4 · 2022: 4 · 2021: 11 · 2020: 4 · 2019: 4 · 2018: 6 · 2017: 7 · 2016: 7 · 2015: 10 · 2014: 5 · 2013: 8 · 2012: 9
FWCI
2.64
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute of Mental Health (MH67414, F31MH067414)
  • National Institute of Neurological Disorders and Stroke (NS-20576, R01NS020576)
  • National Institute of Child Health and Human Development
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (K02HD042269, K02 HD42269, HD39937, R21HD039937)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
Keywords
basolateral amygdala, reward devaluation, muscimol, GABAA receptor, reinforcer value, object preference, secondary reinforcers, macaque, object discrimination
MeSH terms
Amygdala, Analysis of Variance, Animals, Behavior, Animal, Choice Behavior, Discrimination, Psychological, Eating, Extinction, Psychological, Infusion Pumps, Inhibition, Psychological, Macaca nemestrina, Magnetic Resonance Imaging, Muscimol, Receptors, GABA-A, Reward, Satiation, Time Factors, GABA Agonists

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