“…Insofar as PD and insecure attachment are each linked with emotional dysregulation, for instance, both could be mediated by the same heritable differences in temperament or personality traits (Goldsmith & Harman, 1994). It is well established that genes account for 40-60% of the variability in normal personality traits (Plomin, DeFries, McClearn, & McGuffin, 2001), dimensionally defined PD trait scales (Jang, 2005) and to a lesser degree PD diagnoses in recent editions of the DSM (Nigg & Goldsmith, 1994). Although there is far less information on the heritability of attachment styles in adults, Brussoni, Jang, Livesley, and MacBeth (2000) found that genes accounted for 43, 25 and 37% of the variability in fearful, preoccupied and secure attachment assessed with the Relationship Scales Questionnaire (RSQ; Griffin & Bartholomew, 1994).…”