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Active Avoidance Learning Requires Prefrontal Suppression of Amygdala-Mediated Defensive Reactions

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Moscarello, Justin M., LeDoux, Joseph E.·2013·The Journal of Neuroscience

Abstract

Signaled active avoidance (AA) paradigms train subjects to prevent an aversive outcome by performing a learned behavior during the presentation of a conditioned cue. This complex form of conditioning involves pavlovian and instrumental components, which produce competing behavioral responses that must be reconciled for the subject to successfully avoid an aversive stimulus. In signaled AA paradigm for rat, we tested the hypothesis that the instrumental component of AA training recruits infralimbic prefrontal cortex (ilPFC) to inhibit central amygdala (CeA)-mediated Pavlovian reactions. Pretraining lesions of ilPFC increased conditioned freezing while causing a corresponding decrease in avoidance; lesions of CeA produced opposite effects, reducing freezing and facilitating avoidance behavior. Pharmacological inactivation experiments demonstrated that ilPFC is relevant to both acquisition and expression phases of AA learning. Inactivation experiments also revealed that AA produces an ilPFC-mediated diminution of pavlovian reactions that extends beyond the training context, even when the conditioned stimulus is presented in an environment that does not allow the avoidance response. Finally, injection of a protein synthesis inhibitor into either ilPFC or CeA impaired or facilitated AA, respectively, showing that avoidance training produces two opposing memory traces in these regions. These data support a model in which AA learning recruits ilPFC to inhibit CeA-mediated defense behaviors, leading to a robust suppression of freezing that generalizes across environments. Thus, ilPFC functions as an inhibitory interface, allowing instrumental control over an aversive outcome to attenuate the expression of freezing and other reactions to conditioned threat.

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Crossref · 10.1523/jneurosci.2596-12.2013

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  • Prior rodent research has demonstrated that behavioral control over an aversive stimulus reduces Pavlovian threat responses, even when control is no longer possible, and involves the vmPFC and striatum.

    “Prior rodent research has demonstrated that behavioral control over an aversive stimulus reduces Pavlovian threat responses, even when control is no longer possible, and involves the vmPFC and striatum (Baratta et al., 2007; Cain and LeDoux, 2007; Moscarello and LeDoux, 2013; Ramirez et al., 2015).”

    From Active avoidance: Neural mechanisms and attenuation of pavlovian conditioned responding (2017) · cites this paper as Moscarello and LeDoux, 2013

    The Discussion reports that acquiring control over an aversive outcome suppresses conditioned freezing, including when the cue is presented where avoidance is impossible. It implicates the infralimbic prefrontal cortex, a rodent vmPFC region, but the paper does not establish the striatum’s involvement in this effect. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • The vmPFC toggles between amygdala output paths, shifting information flow to promote aversively motivated action instead of Pavlovian freezing responses.

    “The vmPFC is proposed to toggle between these different output paths of the amygdala, shifting the flow of information to promote aversively motivated action instead of Pavlovian freezing responses (Moscarello and LeDoux, 2013; Ramirez et al., 2015).”

    From Active avoidance: Neural mechanisms and attenuation of pavlovian conditioned responding (2017) · cites this paper as Moscarello and LeDoux, 2013

    The Discussion (page unavailable in our copy) proposes that infralimbic prefrontal cortex inhibits central-amygdala-mediated freezing, allowing active avoidance to predominate. It does not describe the vmPFC toggling between distinct amygdala output paths or shifting information flow between them. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • Plasticity in the IL is critical for the persistent reduction of conditioned responses with avoidance.

    “This indicates that plasticity in the IL is critical for the persistent reduction of conditioned responses with avoidance [112].”
  • Avoidance learning results in a persistent reduction in the passive conditioned response, even when the avoidance action is no longer available.

    “One benefit of avoidance learning over extinction for controlling threat reactions is that avoidance learning results in a persistent reduction in the passive conditioned response, even when the avoidance action is no longer available [112].”
  • Acquisition of avoidance and reduction of the persistent conditioned threat reaction following avoidance learning are blocked by injection of protein synthesis inhibitors into the IL.

    “Both the acquisition of avoidance, and the reduction of the persistent conditioned threat reaction following avoidance learning, are blocked by the injection of protein synthesis inhibitors into the IL.”

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Research works printed but not linked: 6

  1. Cain CK LeDoux JE Blanchard RJ Blanchard DC Griebel G Nutt DJ Brain mechanisms of Pavlovian and instrumental aversive conditioning Handbook of Anxiety and Fear 2008 New York Elsevier
  2. Da Costa Gomez TM Behbehani MM An electrophysiological characterization of the projection from the central nucleus of the amygdala to the periaqueductal gray of the rat: the role of opioid receptors Brain Research 1995 689 21 31 8528703
  3. Floyd NS Price JL Ferry AT Keay KA Bandler R Orbitomedial prefrontal cortical projections to distinct longitudinal columns of the periaqueductal gray in the rat J. Comp. Neurol 2000 422 556 578 10861526
  4. LeDoux JE Iwata J Cicchetti P Reis DJ Different projections of the central amygdaloid nucleus mediate autonomic and behavioral correlates of conditioned fear J. Neurosci 1988 8 2517 2529 2854842 PMC6569498
  5. Pavlov IP Conditioned reflexes 1927 London Routledge and Kegan Paul
  6. Viviani D Charlet A ven der Burg E Robinet C Nurni N Abatis M Magara F Stoop R Oxytocin gates fear responses through distinct outputs from the central amygdala Science 2011 333 104 107 21719680

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Authors
Moscarello, J. M., & LeDoux, J. E.
Affiliations
  • New York University (US)
  • Nathan Kline Institute for Psychiatric Research (US)
Corresponding author
Moscarello, Justin M.
Venue
The Journal of Neuroscience
Published
2013-02-27
Volume
33
Issue
9
Pages
3815-3823
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2001417852
Cited by
277
References
38
Citations by year
2026: 18 · 2025: 18 · 2024: 30 · 2023: 14 · 2022: 9 · 2021: 21 · 2020: 18 · 2019: 30 · 2018: 28 · 2017: 19 · 2016: 22 · 2015: 20 · 2014: 19 · 2013: 11
FWCI
13.11
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
Funders
  • National Institute of Mental Health (R01MH038774, F32MH094061)
  • National Institute on Drug Abuse (R01DA029053, R56DA029053)
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
infralimbic cortex, central amygdala, instrumental avoidance, protein synthesis inhibition, avoidance memory
MeSH terms
Amygdala, Analysis of Variance, Animals, Anisomycin, Avoidance Learning, Conditioning, Classical, Conditioning, Operant, Cues, Electrolysis, Male, Muscimol, Neural Pathways, Protein Synthesis Inhibitors, Proto-Oncogene Proteins c-fos, Rats, Sprague-Dawley, Prefrontal Cortex, GABA Agonists, Rats

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