Cited by 83Memory and Neural MechanismsNeurotransmitter Receptor Influence on BehaviorNeuroscience and Neuropharmacology Research

Effects of D-cycloserine on extinction of learned fear to an olfactory cue

Weber, Marianne, Hart, Joe, Richardson, Rick·2007·Neurobiology of Learning and Memory

Abstract

D-cycloserine (DCS), a partial NMDA receptor agonist, facilitates extinction of learned fear in rats and has been used to treat anxiety disorders in clinical populations. However, research into the effects of DCS on extinction is still in its infancy, with visual cues being the primary fear-eliciting stimuli under investigation. In both human and animal subjects odors have been found to associate strongly with aversive events. Therefore, this study examined the generality of the effects of DCS on extinction by testing odor cues. Sprague-Dawley rats were conditioned and extinguished to an odor using varying parameters, injected with either saline or DCS (15 mg/kg) following extinction, and then tested for a freezing response 24 h later. Experiment 1 demonstrated that after 3 odor-shock pairings, rats did not display short-term extinction and DCS had no effect on long-term extinction. Experiment 2 demonstrated that after 3 odor-noise pairings, rats displayed significant short-term extinction and DCS significantly facilitated long-term extinction. Following 2 odor-shock pairings in Experiment 3, half the rats displayed short-term extinction ("extinguishers") and half did not ("non-extinguishers"). DCS facilitated long-term extinction in the "extinguishers" condition but not in the "non-extinguishers" condition. In Experiment 4, following 2 odor-shock pairings and an extra extinction session, DCS had a significant facilitatory effect on long-term extinction. Thus, extinction of freezing to an odor cue was facilitated by systemic injections of DCS, but only when some amount of within-session extinction occurred prior to injection.

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Crossref · 10.1016/j.nlm.2006.12.010

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Authors
Weber, M., Hart, J., & Richardson, R.
Affiliations
UNSW Sydney (AU)
Corresponding author
Richardson, Rick
Venue
Neurobiology of Learning and Memory
Publisher
Elsevier BV
Published
2007-05
Volume
87
Issue
4
Pages
476-482
ISSN
1074-7427 (ISSN-L)
OpenAlex
W2118524208
Cited by
83
References
23
Citations by year
2024: 2 · 2023: 2 · 2022: 2 · 2021: 3 · 2019: 3 · 2018: 6 · 2017: 6 · 2016: 4 · 2015: 5 · 2014: 8 · 2013: 6 · 2012: 9
FWCI
3.84
Type
journal article
Language
en
Open access
closed
Locations
  • Neurobiology of Learning and Memory (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Health and Medical Research Council (300538)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
D-cycloserine, fear extinction, olfactory conditioning, olfactory cues, NMDA receptor agonist, freezing response, anxiety disorders
MeSH terms
Analysis of Variance, Animals, Association Learning, Conditioning, Classical, Cues, Cycloserine, Extinction, Psychological, Fear, Generalization, Stimulus, Male, Smell, Reflex, Startle, Receptors, N-Methyl-D-Aspartate, Rats, Sprague-Dawley, Excitatory Amino Acid Agonists, Rats

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