The prefrontal cortex is involved in delaying gratification and impulse control and moderates the impulses from the limbic system. If this balance is shifted in favor of the limbic system this may contribute to criminal behavior. Terrie Moffitt's developmental theory of crime argues that "life-course-persistent offenders" make up only 6% of the population but commits more than 50% of all crimes and that this is due to a combination neurophysiological deficits and an adverse environment that creates a criminal path that is very difficult to break once started.[1]