Cited by 61Memory and Neural MechanismsNeuroscience and Neuropharmacology ResearchNeurotransmitter Receptor Influence on Behavior

Intra-amygdala infusion of the N-methyl-d-aspartate receptor antagonist AP5 impairs acquisition but not performance of discriminated approach to an appetitive CS

Burns, Lindsay H., Everitt, Barry J., Robbins, Trevor W.·1994·Behavioral and Neural Biology

Abstract

The present experiments investigated the effects of blocking glutamate transmission in the amygdala on the learning and subsequent performance of a discriminated approach response to food, as well as on locomotor activity and a test of neophobia to food. In the appetitive conditioning experiment, three separate groups of rats received intra-amygdala infusions of PBS (phosphate-buffered saline) or 1.0 or 3.0 nmol of AP5, an antagonist at the NMDA glutamate receptor subtype, immediately before each conditioning session. The effects of AP5 on the performance of the discriminated approach response were tested in a fourth group of animals. AP5 dose-dependently impaired the discriminated approach response during the acquisition of the stimulus-reward association but had no effect on the performance of this response after this association was learned. These results suggest that glutamate transmission in the amygdala at the NMDA glutamate receptor subtype is important in the learning process. In separate experiments, intra-amygdala AP5 increased locomotor activity and attenuated the neophobia to food in a novel environment by increasing approaches to the food. Together, these findings parallel the effects of lesions to the basolateral amygdala. In addition, the specific effects on learning are consistent with the hypothesis that NMDA-receptor-mediated LTP underlies specific forms of learning within the amygdala.

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Crossref · 10.1016/s0163-1047(05)80007-x

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  • Plasticity in the LA is required for several forms of appetitively motivated learning.

    “In addition to being essential for aversively motivated learning, plasticity in the LA is also required for several forms of appetitively motivated learning (43–45) and a number of studies have found that separate populations of amygdala neurons mediate aversive and appetitive processing (46–48).”

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Authors
Burns, L. H., Everitt, B. J., & Robbins, T. W.
Affiliations
University of Cambridge (GB)
Corresponding author
Burns, Lindsay H.
Venue
Behavioral and Neural Biology
Publisher
Elsevier BV
Published
1994-05
Volume
61
Issue
3
Pages
242-250
ISSN
0163-1047 (ISSN-L)
OpenAlex
W2056132879
Cited by
61
References
36
Citations by year
2022: 1 · 2021: 1 · 2018: 3 · 2017: 2 · 2016: 1 · 2015: 2 · 2013: 2 · 2012: 1
FWCI
2.79
Type
journal article
Language
en
Open access
closed
Locations
  • Behavioral and Neural Biology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
Keywords
NMDA receptor antagonists, AP5, amygdala, appetitive conditioning, food approach, discriminative stimulus, glutamatergic neurotransmission, long-term potentiation, locomotor activity, basolateral amygdala, learning acquisition
MeSH terms
Amygdala, Animals, Appetitive Behavior, Behavior, Animal, Conditioning, Psychological, Learning, Locomotion, Male, 2-Amino-5-phosphonovalerate, Receptors, N-Methyl-D-Aspartate, N-Methylaspartate, Rats

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