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Genetic and Environmental Influences on Psychopathy Trait Dimensions in a Community Sample of Male Twins

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Abstract

Psychopathy appears to be comprised of two broad dimensions: impulsivity/antisocial behavior and interpersonal detachment/callousness. This study examined the extent to which variance in these 2 psychopathy trait dimensions was associated with common or unique genetic, shared, and nonshared environmental factors in two independent samples of reared together 16–18-year-old male twins. One sample included 142 monozygotic (MZ) and 70 dizygotic (DZ) pairs; the other sample included 128 MZ and 58 DZ pairs. Boys completed the Minnesota Temperament Inventory (MTI), a 19-item measure that contains separate subscales: Antisocial and Detachment. Variance in the Antisocial and Detachment scales was associated with additive genetic factors and neither scale was associated with shared environmental factors. As expected, the bivariate biometric analysis suggested genetic influence on the covariance of the scales. The results are consistent with theoretical models of psychopathy that posit some independence in the etiology of the two major trait dimensions of psychopathy.

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Authors and Affiliations

  1. Department of Psychology, Florida State University, Tallahassee, Florida

    Jeanette Taylor, Bryan R. Loney & Leonardo Bobadilla

  2. Department of Psychology, University of Minnesota, Minneapolis, Minnesota

    William G. Iacono & Matt McGue

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  1. Jeanette Taylor
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  2. Bryan R. Loney
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  5. Matt McGue
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Correspondence to Jeanette Taylor.

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Taylor, J., Loney, B.R., Bobadilla, L. et al. Genetic and Environmental Influences on Psychopathy Trait Dimensions in a Community Sample of Male Twins. J Abnorm Child Psychol 31, 633–645 (2003). https://doi.org/10.1023/A:1026262207449

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