Splicing fear

At times fear is a biological overreaction. Inherited from my distant ancestors, I feel the fear of a sabertooth tiger when my life is in no real danger.

At times fear is a notification that a personal boundary is being crossed. In that way the fear is adaptive and fully valid in my modern life.

Where do you know fear to be an overreaction?

Where do you know fear to be a reminder to protect your boundaries?