I recall being mesmerized and transfixed by a variety of things or incidents, some traumatic, as a child, and I would guess those times either amounted to or led to a variety of at least semi-hypnotic states where I would either quiver or be numb until the situation had either passed or I had somehow (possibly thereby) escaped...then to later return whenever one of them seemed comforting in whatever kind of way. As an adult, I have always known myself as a chameleon...and I suspect all of this might be tied to what you have mentioned even though all the clinical terms and such are not familiar to me.