Gu Ruolei, Jiang Yang, Kiser Seth, Black Chelsea L, Broster Lucas S, Luo Yue-Jia, Kelly Thomas H
CAS Key Laboratory of Behavioral Science, Institute of Psychology, Beijing, China; Department of Psychology, University of Chinese Academy of Sciences, Beijing, China.
Department of Behavioral Science, University of Kentucky College of Medicine, Lexington, KY, USA.
Neuropsychologia. 2017 Aug;103:59-68. doi: 10.1016/j.neuropsychologia.2017.07.013. Epub 2017 Jul 15.
Individual differences in dimensions of impulsivity personality including disinhibition and sensation seeking modulate approach responses to reinforcing stimuli, such as drugs and money. The current study examined the effects of monetary incentive on both behavioral performance and electrophysiological activity among individuals varying in disinhibition and sensation seeking. The monetary incentive delay (MID) task was completed under electroencephalogram (EEG) recording. Behavioral data showed that higher disinhibition and sensation-seeking were associated with lower performance accuracy. Event-related potential (ERP) data showed that high reinforcement cues elicited a larger late positive component (LPC) than other conditions among high disinhibition participants, indicating its strong emotional influence. Additionally, in the neutral incentive condition, the feedback-related negativity (FRN) elicited by correct outcomes was larger than that elicited by incorrect outcomes in the high disinhibition group only. This novel finding indicates that high disinhibition participants were less likely to expect correct outcomes compared to incorrect outcomes in the neutral incentive condition. Finally, the P3 component elicited by outcome presentation showed an interaction between two impulsivity dimensions; when disinhibition level was low, the P3 was larger among high than low sensation seeking participants.
冲动性人格维度（包括去抑制和感觉寻求）的个体差异会调节对强化刺激（如药物和金钱）的趋近反应。本研究考察了金钱奖励对去抑制和感觉寻求程度不同的个体的行为表现和电生理活动的影响。金钱奖励延迟（MID）任务在脑电图（EEG）记录下完成。行为数据表明，较高的去抑制和感觉寻求与较低的表现准确性相关。事件相关电位（ERP）数据表明，在高去抑制参与者中，高强化线索比其他条件下引发更大的晚期正成分（LPC），表明其强烈的情绪影响。此外，在中性奖励条件下，只有高去抑制组中正确结果引发的反馈相关负波（FRN）大于错误结果引发的反馈相关负波。这一新发现表明，在中性奖励条件下，高去抑制参与者与错误结果相比，不太可能预期正确结果。最后，结果呈现引发的P3成分显示出两个冲动性维度之间的相互作用；当去抑制水平较低时，高感觉寻求参与者的P3大于低感觉寻求参与者。
