Instant Genius How to overcome fear, according to a neuroscientist
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Aug 17, 2025 In this insightful conversation, Abby Marsh, a neuroscientist at Georgetown University and featured in National Geographic’s series with Chris Hemsworth, explores the complexities of fear. She discusses how fear serves as both an obstacle and an opportunity for growth. Abby shares fascinating insights on the brain's mechanisms, the psychological benefits of overcoming challenges, and how embracing discomfort can transform fear into a powerful tool for personal fulfillment. Listeners will learn to harness their fears and live more courageous lives.
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Hemsworth's Dam Climb Demonstration
- Chris Hemsworth willingly climbed a closed 600-foot dam in winter as a risk challenge.
- Abby Marsh used the climb to show psychological benefits of tackling hard tasks.
Fear Is Ancient And Fallible
- Fear is an ancient, evolutionarily useful emotion that aims to keep us alive.
- It can mislead us by prompting avoidance of things that would actually benefit us.
Fear Starts Below Consciousness
- Deep brain structures like the amygdala trigger rapid fear responses below conscious control.
- That fast subcortical circuit floods hormones and readies the body for fight or flight.