Ygrec That's an astute pondering,I'd be curious to know as well.Somehow I would think that either a sort of behavior modeling occurred....or genetics were involved?It'd be hard to say .But I imagine that irregardless what sort of household I grew up in,unfortunately I was "drawn this way"...ie...as a person who feels deeply and requires alot of human interaction and stimulation.I feel positive that seclusion would create an irreconcilable madness within me.My brother was raised by my father...and my father ...hmmm....created in him a severe lack of need for other humans.My mother raised me and I am the opposite.I suppose that exposure to modeled behaviors appear in our case to be highly contributory.