From a developmental standpoint, there were several noteworthy findings from the present study. First, a large intercorrelation was detected between the Detachment and Antisocial factors within each time period. Thus, as measured by the MTI, these factors represent overlapping indicators of psychopathic personality in both late adolescence and early adulthood. Notably, strong intercorrelations between psychopathy factors have been previously identified in adolescent samples (Neumann et al., 2006), and is consistent with several different behavioral genetic studies during this developmental period, which have shown that the covariance between interpersonal, affective, and antisocial components of psychopathy can be largely accounted for in terms of a common genetic factor (Baker et al., 2007; Larsson et al., 2007; Taylor et al., 2003). Nevertheless, other behavioral genetic work with adolescent twin samples employing different measures of psychopathy have shown evidence of both common and unique genetic effects across interpersonal (e.g., fearless dominance), affective (e.g., callous unemotionality), and antisocial features of psychopathy (Blonigen et al., 2005; Larsson, Andershed, & Lichtenstein, 2006). While such findings suggest that the expression of psychopathy is multifaceted, they are not necessarily
