Originally Posted by
MickeyAnMeisce 
Actually, I'm saying that the limbic system is not the part of the brain that Trimpey identifies with thehome of "The Beast".
The structural model diagram is obviously an oversimplification, and it is not meant to be 100% precise. It does not actually matter where the lower brain functions physically reside, though. Conceptually, from the addicted person's perspective, all that matters is that they understand that their cravings/urges are being generated by the paleomammalian brain/limbic system, and not their rational, logical mind.
It is known that the insula plays a role in addiction, even though it is physically located in the "upper" part of the brain on the diagram. Smokers who have experienced damage to it explain that they literally "forgot" the urge to smoke. I found that rather interesting, since the insula forms a link between the limbic system and the higher brain functions. It would almost seem like the smokers' "addictive voice" megaphone was silenced.
To be honest, though, one doesn't even need to use Trimpey's "structural model" at all in order to properly apply AVRT. One could attribute the "Addictive Voice" to Satan, for example, as some religions do, and still get the same effect. All that matters is that the AV is thought of as originating outside of one's rational, logical mind.