People who suffer from antisocial and violent behaviour disorder have a predatory attitude toward other people. It is marked by a history of antisocial activity beginning before age 15 and continuing to adulthood, a failure to show responsibility, irritability, aggressiveness, reckless and impulsive behaviour and a disregard for the truth. These individuals lack empathy and fail to learn from experience. Many antisocial adults were delinquents during their adolescent years. Factors that lead to delinquency include poor impulse control, low intelligence, other criminals in the family, poverty and bad parenting. These antisocial adults may act out their aggression in these criminal types: serial killers, rapists, batterers, and child abusers. See section about Criminal Psychology for more information.