Behavior Genetics

, Volume 44, Issue 4, pp 407–418

Adolescent Drinking and Motivated Decision-Making: A Cotwin-Control Investigation with Monozygotic Twins

  • Stephen M. Malone
  • Monica Luciana
  • Sylia Wilson
  • Jordan C. Sparks
  • Ruskin H. Hunt
  • Kathleen M. Thomas
  • William G. Iacono
Brief Communication

DOI: 10.1007/s10519-014-9651-0

Cite this article as:
Malone, S.M., Luciana, M., Wilson, S. et al. Behav Genet (2014) 44: 407. doi:10.1007/s10519-014-9651-0

Abstract

The present study used a monozygotic (MZ) cotwin-control (CTC) design to investigate associations between alcohol use and performance on the Iowa gambling task (IGT) in a sample of 96 adolescents (half female). The MZ CTC design is well suited to shed light on whether poor decision-making, as reflected on IGT performance, predisposes individuals to abuse substances or is a consequence of use. Participants completed structural MRI scans as well, from which we derived gray matter volumes for cortical and subcortical regions involved in IGT performance and reduced in adolescents with problematic alcohol use. Drinking was associated with poorer task performance and with reduced volume of the left lateral orbital-frontal cortex. CTC analyses indicated that the former was due to differences between members of twin pairs in alcohol use (suggesting a causal effect of alcohol), whereas the latter was due to factors shared by twins (consistent with a pre-existing vulnerability for use). Although these preliminary findings warrant replication, they suggest that normative levels of alcohol use may diminish the quality of adolescent decision-making and thus have potentially important public health implications.

Keywords

Adolescent Drinking Decision-making Cotwin-control Identical twins 

Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Stephen M. Malone
    • 1
    • 3
  • Monica Luciana
    • 1
  • Sylia Wilson
    • 1
  • Jordan C. Sparks
    • 1
  • Ruskin H. Hunt
    • 2
  • Kathleen M. Thomas
    • 2
  • William G. Iacono
    • 1
  1. 1.Department of PsychologyUniversity of Minnesota – Twin CitiesMinneapolisUSA
  2. 2.Institute of Child DevelopmentUniversity of Minnesota – Twin CitiesMinneapolisUSA
  3. 3.University of MinnesotaMinneapolisUSA

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