Psychiatrists diagnosed her with narcissistic, histrionic and antisocial personality disorders. Gaslighting is frequently used by people with antisocial personality disorder or narcissistic personality disorder. Often talents are used in antisocial or asocial ways. It leads to psychological distress which causes antisocial behaviour and aggressive attitude. Wuornos also allegedly met the criteria for both borderline personality disorder and antisocial personality disorder. Another theory suggests a possible relationship between histrionic personality disorder and antisocial personality disorder. Psychological analyses estimate Azula as highly intelligent, and suffering from antisocial and narcissistic personality disorders. Involvement in school bullying can be a predictor of future antisocial and criminal behaviour. Studies especially suggest strong comorbidity with antisocial personality disorder. Several animal studies note the role of serotonergic functioning in impulsive aggression and antisocial behavior. Common symptoms in children consisted of depression, antisocial behavior, delinquency, and disruptive behavior in school. Factor 2 is labelled as "chronically unstable, antisocial and socially deviant lifestyle". People that exhibit antisocial behavior demonstrate decreased activity in the prefrontal cortex. Gardner was diagnosed with antisocial personality disorder. For example, extraverted youths are more likely to engage in antisocial or delinquent behavior.