Martin Laura E, Potts Geoffrey F
University of Kansas Medical Center.
Pers Individ Dif. 2009 Feb 1;46(3):303. doi: 10.1016/j.paid.2008.10.019.
Impulsive individuals make risky choices, motivated more by immediate reward than potential long-term negative consequences. We used event-related potentials to study the impact of reward and punishment sensitivity in impulsivity on risky decision-making in a two-card choice task in groups of 14 high and 14 low impulsive undergraduates formed by a median split on the Barratt Impulsiveness Scale score. The high impulsives had a larger P3 and the low impulsives a smaller P3 to the cards when making a low-risk choice suggesting that the high-risk option was the default choice of the high impulsives and the low-risk choice the default for the low impulsives. The low, but not the high impulsives had a larger error-related negativity following high-risk choice indicating that the low impulsives evaluated the risky choice as a poor decision. The results indicate that high impulsive individuals are biased towards immediate reward during option evaluation but are less sensitive to the negative consequences of their choices.
冲动的个体做出冒险选择，更多地受即时奖励而非潜在长期负面后果的驱动。我们使用事件相关电位，在由巴拉特冲动性量表得分中位数划分形成的14名高冲动性和14名低冲动性本科生群体中，研究冲动性中奖励和惩罚敏感性对两卡选择任务中冒险决策的影响。在做出低风险选择时，高冲动性个体对卡片的P3波幅更大，而低冲动性个体的P3波幅更小，这表明高风险选项是高冲动性个体的默认选择，低风险选择是低冲动性个体的默认选择。低冲动性个体在高风险选择后有更大的错误相关负波，但高冲动性个体没有，这表明低冲动性个体将高风险选择评估为一个糟糕的决策。结果表明，高冲动性个体在选项评估过程中偏向即时奖励，但对其选择的负面后果不太敏感。
