“…The individual differences encapsulated by psychopathy include sensation seeking, risk taking, impulsivity, antisociality, and interpersonal callousness (e.g., Hare, 2003;Harris, Skilling, & Rice, 2001;Lalumière, Mishra, & Harris, 2008;Rice & Harris, in press). These are enduring traits that appear in early childhood (Baker, Jacobson, Raine, Lozano, & Bezdjian, 2007;Bersani, Nieuwbeerta, & Laub, 2009;Broidy et al, 2003;Frick et al, 2003;Glenn, Raine, Venables, & Mednick, 2007), and exhibit considerable genetically based stability through the life course (Burt, McGue, Carter, & Iacono, 2007;Hicks et al, 2007;Kendler, Jacobson, Myers, & Eaves, 2008;Loney, Taylor, Butler, & Iacono, 2007;Lynam, Caspi, Moffitt, Loeber, & Stouthamer-Loeber, 2007;Sadeh et al, 2010). Enduring antisocial (sometimes called "externalizing") traits and/or psychopathy exhibit high heritability, and the shared environment appears to have considerably smaller additive effects on their expression (Baker et al, 2007;Bornovalova, Hicks, Iacono, & McGue, 2010;Ferguson, 2010;Forsman, Lichtenstein, Andershed, & Larsson, 2008;Johannson et al, 2008;Kreuger et al, 2002;Larsson et al, 2007;Larsson, Andershed, & Lichtenstein, 2006;Larsson, Viding, & Plomin, 2008;Rhee & Waldman, 2002;Slutske et al, 2008;Taylor, Loney, Bobadilla, Iacono, & McGue, 2003).…”