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.
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This study is supported by the National Institutes of Drug Abuse (NIDA P50DA005312), the National Centers for Research Resources and Advancing Translational Sciences (UL1RR033173, UL1TR000117), the National Natural Science Foundation of China (31571124, 31671173), and the State Scholarship Fund (201504910062).
Refer to Web version on PubMed Central for supplementary material.
Gu, Ruolei; Jiang, Yang; Kiser, Seth; Black, Chelsea L.; Broster, Lucas S.; Luo, Yue-Jia; and Kelly, Thomas H., "Impulsive Personality Dimensions Are Associated with Altered Behavioral Performance and Neural Responses in the Monetary Incentive Delay Task" (2017). Behavioral Science Faculty Publications. 43.