Somehow I doubt that a scientific grounding for RR's structural model of addiction wasn't what you were asking for, not really, anyway.
If I was wrong, just look up the term 'amygdala hijack', and if the similarity is not clear, compare the beast brain, or the lizard brain, to the amygdala.
Here is an excellent treatment of the subject of addiction and amygdala hijack, or the relation of addictive ambivalence to lower brain functions.
http://www.health.harvard.edu/newsle...acks-the-brain