实验运用金钱博弈任务,从行为上探讨了社会距离与任务框架对决策结果的影响,并结合ERP技术进一步探讨了社会距离对风险决策过程的影响.结果发现:正性框架下自我决策时风险选项选择率显著高于为他人决策;负性框架下自我决策时风险选择率显著低于为他人决策;社会距离所诱发的N350、P300和LNP等晚期成分波幅出现明显的分离.N350和LNP成分主要与决策过程中个体的冲突抑制有关,主要表现为为陌生人决策会诱发负走向较大的N350波幅和LNP波幅,而对于正走向的P300成分则发现为朋友决策时的波幅较大.结果表明社会距离影响决策中的再评价过程.%Present study investigated the neurobiological basis of social distance by means of event-related potentials (ERPs) and a novel financial decision-making task-the money gamble game task. The frequency of gamble options for self under the positive effect was significantly higher than that for friends and that for strangers. While under the negative effect, the frequency of gamble options of self-decision making was significantly lower than that for others. There were no difference between early brain waves. While the amplitudes of N350, P300 and LNP (late negative potential) appeared separation between different social distance: decision-making for strangers evoked the greatest amplitude of N350 and LNP, followed by self-decision making, and decision-making for friends is the smallest; While it induced the greatest amplitude of P300, followed by self-decision making, and the smallest is for strangers. The results show that social distance influences the process of re-evaluation of decision-making.
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