Personality Disorders
Personality disorders, in general, appear to be extreme or exaggerated patterns of personality traits that predispose an individual to maladaptive behavior. There is as yet little research into what causes many personality disorders, although there is some evidence for the role of constitutional and genetic factors in disorders such as borderline and schizotypal personality disorders.
One of the most notable personality disorders is the antisocial, or psychopathic, personality disorder. In this disorder, a person is callous and unethical, without loyalty or close friendships. Treatment of psychopaths is difficult because they rarely see any need for any change and blame others for their problems.