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J Adolesc. 2013 Apr;36(2):245-55. doi: 10.1016/j.adolescence.2012.10.006. Epub 2012 Dec 20.

The genetic and environmental etiology of decision-making: a longitudinal twin study.

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  • 1Department of Psychology, University of Southern California, Los Angeles, CA 90089-1061, USA. Tuvblad@usc.edu

Abstract

The present study examined the genetic and environmental etiology of decision-making (Iowa Gambling Task; Bechara, Damásio, Damásio, & Anderson, 1994), in a sample of twins at ages 11-13, 14-15, and 16-18 years. The variance across five 20-trial blocks could be explained by a latent "decision-making'' factor within each of the three times of IGT administration. This latent factor was modestly influenced by genetic factors, explaining 35%, 20% and 46% of the variance within each of the three times of IGT administration. The remaining variance was explained by the non-shared environment (65%, 80% and 54%, respectively). Block-specific non-shared environmental influences were also observed. The stability of decision-making was modest across development. Youth showed a trend to choose less risky decks at later ages, suggesting some improvement in task performance across development. These findings contribute to our understanding of decision-making by highlighting the particular importance of each person's unique experiences on individual differences.

Copyright © 2012 The Foundation for Professionals in Services for Adolescents. Published by Elsevier Ltd. All rights reserved.

PMID:
23261073
[PubMed - indexed for MEDLINE]
PMCID:
PMC3682468
Free PMC Article
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