Neural circuits and mechanisms involved in Pavlovian fear conditioning: A critical review
Open accessAbstract
Pavlovian or classical fear conditioning is recognized as a model system to investigate the neurobiological mechanisms of learning and memory in the mammalian brain and to understand the root of fear-related disorders in humans. In recent decades, important progress has been made in delineating the essential neural circuitry and cellular-molecular mechanisms of fear conditioning. Converging lines of evidence indicate that the amygdala is necessarily involved in the acquisition, storage and expression of conditioned fear memory, and long-term potentiation (LTP) in the lateral nucleus of the amygdala is often proposed as the underlying synaptic mechanism of associative fear memory. Recent studies further implicate the prefrontal cortex-amygdala interaction in the extinction (or inhibition) of conditioned fear. Despite these advances, there are unresolved issues and findings that challenge the validity and sufficiency of the current amygdalar LTP hypothesis of fear conditioning. The purpose of this review is to critically evaluate the strengths and weaknesses of evidence indicating that fear conditioning depend crucially upon the amygdalar circuit and plasticity.
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Context-associated memory deficit is typical in AD patients and manifested as dysfunction of fear conditioning involving neural circuits of the amygdala, hippocampus, and prefrontal cortex.
“Context-associated memory: This deficit is typical in AD patients [128][129][130] and manifested as dysfunction of fear conditioning 82 involving neural circuits of the amygdala, hippocampus, and prefrontal cortex 131,132 .”
From NAD+ hydrolase Sarm1 is a key driver of synapse degeneration and memory loss in Alzheimer’s disease (2025) · cites this paper as [131]
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- Authors
- Kim, J. J., & Jung, M. W.
- Affiliations
- University of Washington (US)
- Ajou University (KR)
- Corresponding author
- Kim, Jeansok J.
- Venue
- Neuroscience & Biobehavioral Reviews
- Publisher
- Elsevier BV
- Published
- 2006-01
- Volume
- 30
- Issue
- 2
- Pages
- 188-202
- ISSN
- 0149-7634 (ISSN-L)
- PMC
- PMC4342048
- OpenAlex
- W2155158396
- Cited by
- 636
- References
- 28
- Citations by year
- 2026: 14 · 2025: 22 · 2024: 33 · 2023: 34 · 2022: 16 · 2021: 29 · 2020: 27 · 2019: 40 · 2018: 36 · 2017: 31 · 2016: 32 · 2015: 38 · 2014: 46 · 2013: 39 · 2012: 39
- FWCI
- 1.98
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Neuroscience & Biobehavioral Reviews (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- AJOU Open Repository (Ajou University) (submittedVersion)
- Funders
- National Institute of Mental Health (R01 MH64457, R01MH064457)
- 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 conditioning, amygdala, long-term potentiation, lateral amygdala, fear extinction, conditioned fear memory, synaptic plasticity, neural circuits, fear-related disorders
- MeSH terms
- Amygdala, Animals, Association Learning, Avoidance Learning, Brain, Conditioning, Classical, Extinction, Psychological, Fear, Memory, Neural Pathways, Prefrontal Cortex
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