At the center of our fear response is the amygdala, an almond-sized structure deep in the brain. Why Modern Stress Makes Fear Harder to RegulateIf our collective mental health is any indicator, people are struggling. When this protective system becomes hypersensitive, it can trick the brain into perceiving threats where none exist. 3 Elements That Make Exposure EffectiveEssentially, repeated, tolerable exposures help the brain form new associations, shifting from threat to safety. Resilience comes from recalibrating the fear system so it responds proportionately.