Although accounts of the disorder vary, psychopathy is generally regarded as a chronic clinical condition associated with extreme egocentricity and interpersonal callousness, impaired emotional function, impulsivity, and an antisocial lifestyle. Most investigators and clinicians agree that the disorder is manifested at a relatively early age (Hare, 1991; Robbins, 1972), that it remains generally stable over the course of a lifetime (Hare, McPherson, & Forth, 1988), and that it is associated with substantial negative impact on others, including instrumental and reactive aggression, intimate partner violence, deception and manipulation, and callousness (Blais, Sodukhin, & Forth, 2014; Häkkänen-Nyholm & Hare, 2009; Hare & Neumann, 2009).