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Prefrontal inputs to the amygdala instruct fear extinction memory formation.

Olena Bukalo1, Courtney R Pinard2, Shana Silverstein1

  • 1Laboratory of Behavioral and Genomic Neuroscience, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, Bethesda, MD 20853, USA. ; Center for Neuroscience and Regenerative Medicine at the Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA.

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Stimulating the ventromedial prefrontal cortex (vmPFC)-amygdala pathway aids fear extinction memory formation. This pathway is crucial for overcoming persistent anxiety after trauma, offering insights for anxiety disorder treatments.

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Area of Science:

  • Neuroscience
  • Psychology
  • Behavioral Science

Background:

  • Persistent anxiety following psychological trauma is characteristic of anxiety disorders.
  • The neural mechanisms underlying the extinction of traumatic fear memories are not fully understood.

Purpose of the Study:

  • To investigate the role of the ventromedial prefrontal cortex (vmPFC)-amygdala pathway in the formation and retrieval of fear extinction memories.
  • To elucidate the neural circuits involved in overcoming persistent fear after trauma.

Main Methods:

  • Selective in vivo stimulation of the vmPFC-amygdala pathway in a preclinical model.
  • Silencing the vmPFC-amygdala pathway to assess its necessity for extinction.
  • Measuring amygdala activity during extinction recall.

Main Results:

  • Stimulating the vmPFC-amygdala pathway enhanced extinction memory formation but not retrieval.
  • Inhibiting this pathway impaired extinction formation and reduced amygdala activity.
  • The vmPFC-amygdala circuit plays a critical role in forming extinction memories.

Conclusions:

  • The vmPFC-amygdala circuit is essential for the formation of extinction memories.
  • Understanding this circuit offers potential therapeutic targets for anxiety disorders, including posttraumatic stress disorder (PTSD).