Cited by 121Memory and Neural MechanismsNeural and Behavioral Psychology StudiesNeurotransmitter Receptor Influence on Behavior

Selective bilateral amygdala lesions in rhesus monkeys fail to disrupt object reversal learning

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Izquierdo, Alicia, Murray, Elisabeth A.·2007·The Journal of Neuroscience

Abstract

Neuropsychological studies in nonhuman primates have led to the view that the amygdala plays an essential role in stimulus–reward association. The main evidence in support of this idea is that bilateral aspirative or radiofrequency lesions of the amygdala yield severe impairments on object reversal learning, a task that assesses the ability to shift choices of objects based on the presence or absence of food reward (i.e., reward contingency). The behavioral effects of different lesion techniques, however, can vary. The present study therefore evaluated the effects of selective, excitotoxic lesions of the amygdala in rhesus monkeys on object reversal learning. For comparison, we tested the same monkeys on a task known to be sensitive to amygdala damage, the reinforcer devaluation task. Contrary to previous results based on less selective lesion techniques, monkeys with complete excitotoxic amygdala lesions performed object reversal learning as quickly as controls. As predicted, however, the same operated monkeys were impaired in making object choices after devaluation of the associated food reinforcer. The results suggest two conclusions. First, the results demonstrate that the amygdala makes a selective contribution to stimulus–reward association; the amygdala is critical for guiding object choices after changes in reward value but not after changes in reward contingency. Second, the results implicate a critical contribution to object reversal learning of structures nearby the amygdala, perhaps the subjacent rhinal cortex.

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Crossref · 10.1523/jneurosci.3616-06.2007

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Research works printed but not linked: 3

  1. Baxter MG, Saunders RC, Murray EA (1998) Aspiration lesions of the amygdala interrupt connections between prefrontal cortex and temporal cortex in rhesus monkeys. Soc Neurosci Abstr 24:757.
  2. Munoz M, Mishkin M, Saunders RC (2001) Medial temporal removals dis- connect rostral superior temporal gyrus from frontal cortex. Soc Neurosci Abstr 27:535.
  3. Murray EA (1992) Medial temporal lobe structures contributing to recog- nition memory: the amygdaloid complex versus the rhinal cortex. In: The amygdala: neurobiological aspects of emotion, memory, and mental dys- function (Aggleton JP, ed), pp 453-470. New York: Wiley.

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Authors
Izquierdo, A., & Murray, E. A.
Affiliations
National Institutes of Health (US)
Venue
The Journal of Neuroscience
Published
2007-01-31
Volume
27
Issue
5
Pages
1054-1062
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2014284272
Cited by
121
References
49
Citations by year
2026: 2 · 2025: 4 · 2024: 2 · 2023: 1 · 2022: 4 · 2021: 8 · 2020: 4 · 2019: 3 · 2018: 3 · 2017: 5 · 2016: 4 · 2015: 7 · 2014: 3 · 2013: 9 · 2012: 8
FWCI
7.16
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Soochow University
  • National Institutes of Health
  • National Institute of Mental Health
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
amygdala, excitotoxic lesions, rhesus monkeys, stimulus-reward associations, reinforcer devaluation, reward contingency, rhinal cortex, reward-guided behavior
MeSH terms
Amygdala, Animals, Choice Behavior, Functional Laterality, Macaca mulatta, Male, Reinforcement, Psychology, Reversal Learning

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