Extraversion and reward-processing: Consolidating evidence from an electroencephalographic index of reward-prediction-error
Luke D Smillie, Hayley K Jach, David M Hughes, Jan Wacker, Andrew J Cooper, Alan D Pickering
Biological Psychology | ELSEVIER | Published : 2019
Trait extraversion has been theorized to emerge from functioning of the dopaminergic reward system. Recent evidence for this view shows that extraversion modulates the scalp-recorded Reward Positivity, a putative marker of dopaminergic signaling of reward-prediction-error. We attempt to replicate this association amid several improvements on previous studies in this area, including an adequately-powered sample (N = 100) and thorough examination of convergent-divergent validity. Participants completed a passive associative learning task presenting rewards and non-rewards that were either predictable or unexpected. Frequentist and Bayesian analyses confirmed that the scalp recorded Reward Posi..View full abstract
Funding support was provided to Luke Smillie by The University of Melbourne. Hayley Jach recieved funding in the form of an Australian Postgraduate Award (scholarship), and from the Melbourne Neuroscience Institute. This research did not receive any other specific grant from funding agencies in the public, commercial, or not-for-profit sectors.