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A model of amygdala function following plastic changes at specific synapses during extinction.

Maxwell R Bennett1,2, Les Farnell2,3, William G Gibson2,3

  • 1The Brain and Mind Centre, University of Sydney, Camperdown, NSW, Australia.

Neurobiology of Stress
|June 14, 2019
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This study models amygdala networks for fear extinction, crucial for treating PTSD. Simulations reveal how neural pathways and endocannabinoids regulate fear memory and its suppression.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Psychology

Background:

  • The amygdala's role in emotion, particularly fear and its extinction, is of significant interest.
  • Understanding fear extinction is vital for developing treatments for post-traumatic stress disorder (PTSD).

Purpose of the Study:

  • To model the synaptic networks involved in fear extinction within the amygdala.
  • To investigate the plasticity properties of synaptic connections in these extinction networks.
  • To simulate the mechanisms underlying fear memory formation and extinction.

Main Methods:

  • Development of computational modules representing key components of amygdala extinction networks.
  • Inclusion of excitatory and inhibitory neurons and synaptic plasticity mechanisms within each module.
  • Concentration on equilibrium outputs of the model, rather than dynamic plasticity mechanisms.

Main Results:

  • The model simulates Pavlovian fear conditioning, establishing fear memory in the lateral amygdala.
  • Simulations show infralimbic medial prefrontal cortex activation leading to endocannabinoid release and enhanced synaptic efficacy in extinction pathways.
  • The model explains experimental findings on the roles of the infralimbic cortex and endocannabinoids in fear extinction phases.

Conclusions:

  • The developed model provides a framework for understanding the neural circuitry of fear extinction.
  • The findings highlight the interplay between neural pathways and endocannabinoid signaling in regulating fear memory.
  • This research offers insights into potential therapeutic targets for PTSD by elucidating fear extinction mechanisms.