Dopamine and risk choices in different domains: Findings among serious tournament bridge players

We explore how risk-taking in the card game contract bridge, and in a financial gamble, correlate with variation in the dopamine receptor D4 gene (DRD4) among serious tournament bridge players. In bridge risk-taking, we find significant interactions between genetic predisposition and skill. Among men with the 7-repeat allele of DRD4, namely 7R+ men, those with more bridge skill take more good risks and fewer bad risks, while the opposite is found for less-expert 7R+ men. Conversely, skill does not predict risk-taking among men without the 7R+ allele. Consistent with some prior studies, we also find that 7R+ men take more risk in the financial gamble. We find no relationship between 7R+ and either risk measure among our female subjects. Our results suggest that the dopamine system plays an important role in individual differences in risk-taking among men, and is the first to distinguish between advantageous and disadvantageous risk-taking.