I'm sure that I've posted this link before but I think it's an interesting look at one model of the way fear can work in 2 ways in the brain. How it works in the "mind" probably would need a different model. It can also be looked at as why some fear can be completely "non rational".
I believe that we all have differing levels of amygdala reactivity that make some of us more susceptible to being emotionally reactive to stimulus. Many of our traits may be a result of this sensitivity. This could be one reason for "nice guys" as conflict avoider it's a learned coping mechanism from way back keep everything smooth and there will be no stress.
Not sure if this fits exactly in this conversation but I felt it may be useful information.
