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Related Concept Videos

Role of Amygdala in Memory01:16

Role of Amygdala in Memory

The amygdala is a small, almond-shaped structure responsible for processing and storing memories, particularly those linked to emotions like fear and stress. It plays an essential role in the brain's response to emotionally significant events and often enhances memory formation by triggering stress hormone release. The amygdala is vital for encoding and retrieving memories associated with fear or stress, a process that is adaptive by helping organisms avoid dangerous situations.
One of the...

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Related Experiment Video

Updated: May 20, 2026

Trace Fear Conditioning in Mice
07:02

Trace Fear Conditioning in Mice

Published on: March 20, 2014

Dynorphins regulate fear memory: from mice to men.

Andras Bilkei-Gorzo1, Susanne Erk, Britta Schürmann

  • 1Institute of Molecular Psychiatry, University of Bonn, 53125 Bonn, Germany.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|July 6, 2012
PubMed
Summary
This summary is machine-generated.

Dynorphin signaling is crucial for overcoming fear memories. This study found that dynorphin deficiency impairs fear extinction in mice and humans, highlighting its therapeutic potential.

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Last Updated: May 20, 2026

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07:02

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Published on: March 20, 2014

Contextual and Cued Fear Conditioning Test Using a Video Analyzing System in Mice
19:32

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Published on: March 1, 2014

An Appetitive Spatial Working Memory Task for Mice in a Semi-Automated 8-Arm Radial Maze, Reducing Fearful Memory Association in the Maze
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An Appetitive Spatial Working Memory Task for Mice in a Semi-Automated 8-Arm Radial Maze, Reducing Fearful Memory Association in the Maze

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Psychology

Background:

  • Trauma-focused cognitive behavioral therapy involves reexposure to trauma reminders.
  • The physiological mechanisms of fear memory extinction are not fully understood.
  • Key brain regions like the amygdala, prefrontal cortex, and hippocampus are involved in fear processing.

Purpose of the Study:

  • To investigate the role of dynorphins in the formation and extinction of fear memories.
  • To explore the involvement of dynorphin kappa-opioid receptor signaling in fear extinction.
  • To translate findings from mice to humans using a genetic polymorphism approach.

Main Methods:

  • Investigated fear conditioning and extinction in mice lacking dynorphin.
  • Used pharmacological blockade of kappa-opioid receptors in mice.
  • Analyzed neuronal activity using c-fos expression in mice.
  • Conducted fear conditioning and extinction in human volunteers with a specific PDYN gene polymorphism, using functional MRI.

Main Results:

  • Mice lacking dynorphin exhibited enhanced fear conditioning and delayed extinction.
  • Pharmacological blockade of kappa-opioid receptors mimicked the delayed extinction phenotype.
  • Reduced neuronal activity in limbic structures was observed during extinction in dynorphin-deficient mice.
  • Human volunteers with the PDYN (T) allele showed reduced fear extinction and diminished amygdala-vmPFC functional connectivity.

Conclusions:

  • Dynorphin kappa-opioid receptor signaling plays a significant role in fear extinction.
  • Genetic variations in the dynorphin gene impact fear extinction mechanisms in humans.
  • These findings provide insights into the neurobiological basis of fear memory processing and extinction.