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Different mechanisms of fear extinction dependent on length of time since fear acquisition

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Myers, Karyn M., Ressler, Kerry J., Davis, Michael·2006·Learning & Memory

DOI 10.1101/lm.119806PMC PMC1409828

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Abstract

Fear extinction is defined as a decline in conditioned fear responses (CRs) following nonreinforced exposure to a feared conditioned stimulus (CS). Behavioral evidence indicates that extinction is a form of inhibitory learning: Extinguished fear responses reappear with the passage of time (spontaneous recovery), a shift of context (renewal), and unsignaled presentations of the unconditioned stimulus (reinstatement). However, there also is evidence to suggest that extinction is an "unlearning" process corresponding to depotentiation of potentiated synapses within the amygdala. Because depotentiation is induced more readily at short intervals following LTP induction and is not inducible at all at a sufficient delay, it may be that extinction initiated shortly following fear acquisition preferentially engages depotentiation/"unlearning," whereas extinction initiated at longer delays recruits a different mechanism. We investigated this possibility through a series of behavioral experiments examining the recoverability of conditioned fear following extinction. Consistent with an inhibitory learning mechanism of extinction, rats extinguished 24-72 h following acquisition exhibited moderate to strong reinstatement, renewal, and spontaneous recovery. In contrast, and consistent with an erasure mechanism, rats extinguished 10 min to 1 h after acquisition exhibited little or no reinstatement, renewal, or spontaneous recovery. These data support a model in which different neural mechanisms are recruited depending on the temporal delay of fear extinction.

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Authors: Myers, K. M., Ressler, K. J., & Davis, M.
Affiliations: Emory University (US)
ORCID: Ressler, Kerry J.
Davis, Michael
Venue: Learning & Memory
Publisher: Cold Spring Harbor Laboratory
Published: 2006-03
Volume: 13
Issue: 2
Pages: 216-223
ISSN: 1072-0502 (ISSN-L)
1549-5485
DOI: 10.1101/lm.119806
PMC: PMC1409828
OpenAlex: W2156746271
Cited by: 334
References: 70
Citations by year: 2026: 12 · 2025: 14 · 2024: 9 · 2023: 11 · 2022: 17 · 2021: 15 · 2020: 12 · 2019: 18 · 2018: 23 · 2017: 10 · 2016: 16 · 2015: 12 · 2014: 17 · 2013: 20 · 2012: 24
Type: posted content
Language: en
Open access: bronze
doi.org
Locations: Learning & Memory (publishedVersion)
PubMed Central (publishedVersion)
PubMed (publishedVersion)
Funders: National Science Foundation (9876754)
Woodruff Foundation
National Institute of Mental Health (MH 47840, R37MH047840, R01MH047840)
Topics: Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Life Sciences › Neuroscience › Cognitive Neuroscience › Memory Processes and Influences
Keywords: fear extinction, spontaneous recovery, reinstatement, renewal, inhibitory learning, depotentiation, unlearning, long-term potentiation, amygdala, fear conditioning
MeSH terms: Animals, Association Learning, Conditioning, Classical, Extinction, Psychological, Fear, Male, Retention, Psychology, Time Factors, Rats, Sprague-Dawley, Rats

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Different mechanisms of fear extinction dependent on length of time since fear acquisition

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