How Psilocybin Reduces Fear: The Amygdala Mechanism
Direct Answer: Psilocybin reduces amygdala reactivity to threatening stimuli. Neuroimaging studies show lasting reductions in amygdala reactivity after psilocybin therapy, correlating with clinical improvements in anxiety and PTSD.
The Amygdala in Anxiety and PTSD
In anxiety, PTSD, and depression, the amygdala becomes hyperreactive — triggering fear responses to non-threatening stimuli. Multiple fMRI studies show psilocybin significantly reduces amygdala reactivity to negative emotional stimuli.
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Does psilocybin permanently reduce fear responses?
The changes appear lasting but not necessarily permanent. Clinical studies show effects persisting for 6+ months after a single session.
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