Cited by 75Memory and Neural MechanismsNeural and Behavioral Psychology StudiesMemory Processes and Influences

Medial prefrontal pathways for the contextual regulation of extinguished fear in humans

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Åhs, Fredrik, Kragel, Philip A., Zielinski, David J., Brady, Rachael, LaBar, Kevin S.·2015·NeuroImage

Abstract

The maintenance of anxiety disorders is thought to depend, in part, on deficits in extinction memory, possibly due to reduced contextual control of extinction that leads to fear renewal. Animal studies suggest that the neural circuitry responsible fear renewal includes the hippocampus, amygdala, and dorsomedial (dmPFC) and ventromedial (vmPFC) prefrontal cortex. However, the neural mechanisms of context-dependent fear renewal in humans remain poorly understood. We used functional magnetic resonance imaging (fMRI), combined with psychophysiology and immersive virtual reality, to elucidate how the hippocampus, amygdala, and dmPFC and vmPFC interact to drive the context-dependent renewal of extinguished fear. Healthy human participants encountered dynamic fear-relevant conditioned stimuli (CSs) while navigating through 3-D virtual reality environments in the MRI scanner. Conditioning and extinction were performed in two different virtual contexts. Twenty-four hours later, participants were exposed to the CSs without reinforcement while navigating through both contexts in the MRI scanner. Participants showed enhanced skin conductance responses (SCRs) to the previously-reinforced CS+ in the acquisition context on Day 2, consistent with fear renewal, and sustained responses in the dmPFC. In contrast, participants showed low SCRs to the CSs in the extinction context on Day 2, consistent with extinction recall, and enhanced vmPFC activation to the non-reinforced CS-. Structural equation modeling revealed that the dmPFC fully mediated the effect of the hippocampus on right amygdala activity during fear renewal, whereas the vmPFC partially mediated the effect of the hippocampus on right amygdala activity during extinction recall. These results indicate dissociable contextual influences of the hippocampus on prefrontal pathways, which, in turn, determine the level of reactivation of fear associations.

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Crossref · 10.1016/j.neuroimage.2015.07.051

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  • New research implicates a dmPFC-hippocampus circuit that controls fear renewal by modulating amygdala output according to differing contexts.

    “New research implicates vmPFC in the learning of safety memories by the inhibition of fear responses previously linked to danger signals in the Am (196) and implicates a dmPFC–hippocampus circuit that controls fear renewal by modulating Am output according to differing contexts (197).”

    From The Stress Acceleration Hypothesis of Nightmares (2017) · cites this paper as [197]

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Authors
Åhs, F., Kragel, P. A., Zielinski, D. J., Brady, R., & LaBar, K. S.
Affiliations
  • Uppsala University (SE)
  • Duke University (US)
Corresponding author
LaBar, Kevin S.
Venue
NeuroImage
Publisher
Elsevier BV
Published
2015-11
Volume
122
Pages
262-271
ISSN
1053-8119 (ISSN-L)
OpenAlex
W987539735
Cited by
75
References
49
Citations by year
2026: 5 · 2025: 6 · 2024: 6 · 2023: 2 · 2022: 6 · 2021: 4 · 2020: 10 · 2019: 9 · 2018: 11 · 2017: 12 · 2016: 3 · 2015: 1
FWCI
5.42
Type
journal article
Language
en
Open access
Locations
  • NeuroImage (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institute on Drug Abuse (R01DA027802)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory Processes and Influences
Keywords
fear extinction, fear renewal, medial prefrontal cortex, dorsomedial prefrontal cortex, ventromedial prefrontal cortex, hippocampus, amygdala, memory extinction, anxiety disorders, fear conditioning, skin conductance response, extinction recall
MeSH terms
Adult, Amygdala, Anxiety, Brain Mapping, Conditioning, Psychological, Environment, Extinction, Psychological, Fear, Female, Galvanic Skin Response, Hippocampus, Humans, Magnetic Resonance Imaging, Male, Neural Pathways, Psychophysiology, Mental Recall, User-Computer Interface, Prefrontal Cortex

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