Interesting question. In terms of abuse or lack of stimuli, one would become stuck in time and thus emotional growth stops. In terms of regression, once someone goes through a life changing event (long or short term), they begin to compartmentalize (a form of protection). This in it self could lead to many psycholocial implications: basic (term used loosely) personality disorders, multiple personalities, sociopathic tendancies, or just a destructive personality. Ultimatly I would think, unless the issues are appropriatly dealt with, that one would (unconsiously) find themselves returning