Abstract
Current exposure-based therapies aimed to reduce pathological fear and anxiety are now amongst the most effective interventions for trauma and anxiety related disorders. Nevertheless, they can be further improved to enhance initial and long-term outcomes. It is now widely accepted that a greater understanding of the neurobiological mechanisms of fear extinction is needed to further develop and identify novel effective targeted treatments as well as prevention strategies for fear-based and anxiety-related disorders. Guided by elegant mechanistic, cellular, and molecular preclinical reports, data from imaging studies are beginning to shape our understanding of how fear is quelled in the human brain. In this article, we briefly review the neural circuits underlying fear extinction in rodents and healthy humans. We then review how these circuits may fail to extinguish fear in patients with anxiety disorders. We end with a discussion examining how fear extinction research may lead to significant advances of current therapeutics for anxiety disorders.
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