Abstract
This study reports the first behavioral genetic investigation of the three Dark Triad variables (narcissism, Machiavellianism, and psychopathy) and their relationships with the Big 5 personality traits. A total of 278 adult twins completed questionnaire measures of the Dark Triad and the Big 5. Consistent with some previous studies, we found significant correlations among some of the Dark Triad variables and between each of the Dark Triad variables and some of the Big 5. To the extent that these variables were correlated at the phenotypic level, these correlations were largely attributable to correlated genetic factors. At the univariate level, all traits showed the influence of genetic and non-shared environmental factors, with heritabilities ranging between .31 and .72; Machiavellianism alone also showed the influence of shared environmental factors.
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