Contributions of the Medial Prefrontal Cortex to Social Influence in Economic Decision-Making

Research output: Contribution to journalArticlepeer-review

Authors

Colleges, School and Institutes

External organisations

  • University of London TWO 0EX

Abstract

Economic decisions are guided by highly subjective reward valuations (SVs). Often these SVs are over-ridden when individuals conform to social norms. Yet, the neural mechanisms that underpin the distinct processing of such normative reward valuations (NVs) are poorly understood. The dorsomedial and ventromedial portions of the prefrontal cortex (dmPFC/vmPFC) are putatively key regions for processing social and economic information respectively. However, the contribution of these regions to economic decisions guided by social norms is unclear. Using functional magnetic resonance imaging and computational modeling we examine the neural mechanisms underlying the processing of SVs and NVs. Subjects (n = 15) indicated either their own economic preferences or made similar choices based on a social norm-learnt during a training session. We found that that the vmPFC and dmPFC make dissociable contributions to the processing of SV and NV. Regions of the dmPFC processed "only" the value of rewards when making normative choices. In contrast, we identify a novel mechanism in the vmPFC for the coding of value. This region signaled both subjective and normative valuations, but activity was scaled positively for SV and negatively for NV. These results highlight some of the key mechanisms that underpin conformity and social influence in economic decision-making.

Bibliographic note

© The Author 2017. Published by Oxford University Press.

Details

Original languageEnglish
Pages (from-to)4635-4648
Number of pages14
JournalCerebral Cortex
Volume27
Issue number9
Publication statusPublished - 1 Sep 2017

Keywords

  • Adolescent, Adult, Brain Mapping/methods, Choice Behavior/physiology, Decision Making/physiology, Female, Humans, Image Processing, Computer-Assisted/methods, Magnetic Resonance Imaging/methods, Male, Prefrontal Cortex/physiopathology, Reward, Social Behavior, Young Adult