Strong emotions like fear, sadness etc., beliefs and habits create neural pathways in the brain (or wire the brain in a particular way). From childhood the brain learns to connect certain responses to certain stimuli.
Your DNA also predisposes you to on the alert be constantly to avoid danger, the need for survival. Your amygdala or fear centre is wired to pick up danger signals, its releases certain chemicals that fills you with that spurt of courage to stand up and fight or take flight.
This does not mean that your brain is hardwired and nothing can be done about it. You could learn to block these neural paths, obstruct the programmed behavior and teach your brain to respond in ways that are different from its learned patterns of behavior.
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