The first hypothesis stated that the three personality traits (narcissism, psychopathy, and Machiavellianism) would be correlated with one another as they are similar traits.
The second hypothesis stated that the callous unemotional personalities would show a strong correlation with the types of aggression, behavioral dysregulation, and delinquency. However, the authors did not expect the CU traits to be linked to emotional dysregulation. The third hypothesis stated that the authors believed the trait narcissism would show a strong association with the two types of aggression, delinquency, and both behavioral and emotional dysregulation. The fourth and final hypothesis stated that Machiavellianism would be strongly correlated with relational aggression and emotional dysregulation but not with overt aggression, delinquency, or behavioral dysregulation.
The authors based their study on previous research conducted on narcissism, psychopathy, and Machiavellianism, along with studies that conducted research into the individual traits and their relationship to
aggression.
For this study the authors recruited participants from an area surrounding a college campus specifically looking for adolescent boys. For this study self-reports were used. Before administering the reports the authors also had the participant fill out a demographic study. To measure aggression the authors used Marsee’s 2011 Peer Conflict Scale. This scale was used for both overt and relational aggression. To asses antisocial behavior in adolescents, or psychopathy, Frick and Hare’s 2001 Antisocial Process Screening Device was utilized. The callous unemotional personality traits were also measured using Frick’s 2004 Inventory of Callous-Unemotional Traits. To measure the level of Machiavellianism in children, the authors used Nachamie’s 1969, The Children’s Machiavellian Scale. To measure dysregulation, both behavioral and emotional, the authors used Mezzich et al’s 2001 Abbreviated Dysregulation Inventory. To assess the level of delinquency the authors used Elliot et al’s 1985 Self-Report of Delinquency.