title: Enhancing the Activity of the DLPFC with tDCS Alters Risk Preference without Changing Interpersonal Trust.
abstract: Interpersonal trust plays an essential role in economic interactions and social development. Extensive behavioral experiments have examined the nature of trust, particularly the question of whether trusting decisions are connected to risk preferences or risk attitudes. Various laboratory observations have been reported regarding the difference between trust and risk, and neural imaging studies have demonstrated that the right dorsolateral prefrontal cortex (rDLPFC) is more activated when individuals decide to trust other human beings compared with individuals decide to invest in a non-social risk condition. Moreover, the rDLPFC has been found to exhibit an intimate relationship with risk preference in previous neuroscience studies. However, the causal relationship between the rDLPFC and trust has rarely been revealed. Whether modulating the excitability of the rDLPFC, which shares roles in both trust and risk decisions, alters the trust or risk preference of participants remains unknown. In the present study, we aimed to provide evidence of a direct link between the neural and behavioral results through the application of transcranial direct current stimulation (tDCS) over the rDLPFC. We found that activating the rDLPFC altered the risk preferences of our participants, whereas no such significant effect over interpersonal trust was observed. Our findings indicate that enhancing the excitability of the rDLPFC using tDCS leads to more conservative decision-makings in a risk game, and this effect is specific to non-social risk rather than social-related trust.
authors.affiliation: School of Economics and Interdisciplinary Center for Social Sciences, Zhejiang UniversityHangzhou, China; School of Economics, Center for Economic Behavior and Decision-making, Neuro & Behavior EconLab, Zhejiang University of Finance and EconomicsHangzhou, China.
authors.forename: Haoli
authors.initials: H
authors.lastname: Zheng
authors.affiliation: School of Economics and Interdisciplinary Center for Social Sciences, Zhejiang University Hangzhou, China.
authors.forename: Siqi
authors.initials: S
authors.lastname: Wang
authors.affiliation: School of Economics and Interdisciplinary Center for Social Sciences, Zhejiang University Hangzhou, China.
authors.forename: Wenmin
authors.initials: W
authors.lastname: Guo
authors.affiliation: School of Economics and Interdisciplinary Center for Social Sciences, Zhejiang University Hangzhou, China.
authors.forename: Shu
authors.initials: S
authors.lastname: Chen
authors.affiliation: School of Economics, Center for Economic Behavior and Decision-making, Neuro & Behavior EconLab, Zhejiang University of Finance and Economics Hangzhou, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Luo
authors.affiliation: School of Economics and Interdisciplinary Center for Social Sciences, Zhejiang UniversityHangzhou, China; School of Economics, Center for Economic Behavior and Decision-making, Neuro & Behavior EconLab, Zhejiang University of Finance and EconomicsHangzhou, China.
authors.forename: Hang
authors.initials: H
authors.lastname: Ye
authors.affiliation: School of Economics and Interdisciplinary Center for Social Sciences, Zhejiang University Hangzhou, China.
authors.forename: Daqiang
authors.initials: D
authors.lastname: Huang
keywords: dorsolateral prefrontal cortex; risk; transcranial direct current stimulation; trust; trust game