Risky behavior in gambling tasks in individuals with ADHD--a systematic literature review

PLoS One. 2013 Sep 13;8(9):e74909. doi: 10.1371/journal.pone.0074909. eCollection 2013.

Abstract

Objective: The aim of this review was to gain insight into the relationship between Attention deficit hyperactivity disorder (ADHD) and risky performance in gambling tasks and to identify any potential alternate explanatory factors.

Methods: PsycINFO, PubMed, and Web of Knowledge were searched for relevant literature comparing individuals with ADHD to normal controls (NCs) in relation to their risky performance on a gambling task. In total, fourteen studies in children/adolescents and eleven studies in adults were included in the review.

Results: Half of the studies looking at children/adolescents with ADHD found evidence that they run more risks on gambling tasks when compared to NCs. Only a minority of the studies on adults with ADHD reported aberrant risky behavior. The effect sizes ranged from small to large for both age groups and the outcome pattern did not differ between studies that applied an implicit or explicit gambling task. Two studies demonstrated that comorbid oppositional defiant disorder (ODD) and conduct disorder (CD) increased risky behavior in ADHD. Limited and/or inconsistent evidence was found that comorbid internalizing disorders (IDs), ADHD subtype, methylphenidate use, and different forms of reward influenced the outcomes.

Conclusion: The evidence for increased risky performance of individuals with ADHD on gambling tasks is mixed, but is stronger for children/adolescents with ADHD than for adults with ADHD, which may point to developmental changes in reward and/or penalty sensitivity or a publication bias for positive findings in children/adolescents. The literature suggests that comorbid ODD/CD is a risk factor in ADHD for increased risky behavior. Comorbid IDs, ADHD subtype, methylphenidate use, and the form of reward received may affect risky performance in gambling tasks; however, these factors need further examination. Finally, the implications of the findings for ADHD models and the ecological validity of gambling tasks are discussed.

Publication types

  • Review
  • Systematic Review

MeSH terms

  • Attention Deficit Disorder with Hyperactivity / physiopathology
  • Attention Deficit Disorder with Hyperactivity / psychology*
  • Female
  • Gambling / physiopathology
  • Gambling / psychology*
  • Humans
  • Male
  • PubMed
  • Risk-Taking*

Grant support

This study was not funded by an external granting institution. The conduct of this study was facilitated by the Department of Clinical and Developmental Neuropsychology, University of Groningen. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.