The first author wishes to dedicate this article to the memory of his beloved mother, Anna Imbò, PsyD, who taught him the meaning of attachment and love, and sadly passed away during the completion of this work. Also the authors thank Guido Alessandri, PhD, for his kind and helpful assistance with the statistical analysis.
A Twin Study of Attachment Style in Young Adults
Article first published online: 26 SEP 2011
© 2011 The Authors. Journal of Personality © 2011, Wiley Periodicals, Inc.
Journal of Personality
Volume 79, Issue 5, pages 965–992, October 2011
How to Cite
Picardi, A., Fagnani, C., Nisticò, L. and Stazi, M. A. (2011), A Twin Study of Attachment Style in Young Adults. Journal of Personality, 79: 965–992. doi: 10.1111/j.1467-6494.2010.00707.x
- Issue published online: 26 SEP 2011
- Article first published online: 26 SEP 2011
- Accepted manuscript online: 1 DEC 2010 06:50AM EST
ABSTRACT The relative contribution of genetic and environmental influences to individual differences in attachment security is still incompletely understood. We assessed attachment style with the Experiences in Close Relationships questionnaire in a volunteer sample of 677 twins (43% male) ages 23–24 years drawn from the population-based Italian Twin Register, who belonged to 244 complete pairs (46% monozygotic) and 189 unmatched pairs. Genetic structural equation modeling was performed with the Mx program. Genetic effects accounted for 45% and 36% of individual differences in attachment-related anxiety and avoidance, respectively. Furthermore, the covariation between anxiety and avoidance was found to be mainly due to genetic factors, with heritability of the latent attachment security phenotype estimated at 62%. Unshared environmental factors explained the remaining proportion of variance. Although our findings are best regarded as preliminary given some study limitations, they suggest that both nature and nurture contribute to individual differences in adult attachment.