One of the things that has been preoccupying my mind in the last few years has been the subject of core wounds to the psyche and how life bounces off, on or around the grooves trauma leaves. All it takes is a similar *frequency* (see also experience) that triggers the memory that resonates with the initial core trauma and there you have perpetuated wounding.
That said, I'm going through the theorizing experientially (natch) and while observing, I get triggered, pull myself back and rationalize and then use free will choice where to put the new experience thus creating a brand new positive memory (groove) where the wounding (trauma) used to be. Next time a potential trigger emerges it no longer has the devastating effects as in the past. Hard work though.
For me now - with really deep, deep scars - I'd say about a 5.
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Natives who beat drums to drive off evil spirits are objects of scorn to smart Americans who blow horns to break up traffic jams. ~Mary Ellen Kelly