Does Cooperation with Others Reduce Risky Gambling Behavior?¹

Abstract Social relationships are highly salient for problem gambling. This study investigated the effect of others' presence or cooperation with others on risky gambling behavior among healthy undergraduate students. Based findings that individual differences moderate social facilitation and team performance, we also focused personality traits. A total 36 participants completed Game Dice Task (GDT) in three conditions, within a crossover design: sole condition (each participant conducted GDT individually), parallel another participant), (participants at same time were told to consult each other). Before experiment, all NEO Five Factor Inventory. The results showed no significant sole, parallel, conditions terms behavior. However, safer was significantly positively correlated conscientiousness. These suggest new harm‐reduction strategy focusing while could be developed.