Smillie, Luke D.; Jach, Hayley K. M.; Hughes, David M.; Wacker, Jan; Cooper, Andrew and Pickering, Alan. 2019. Extraversion and Reward-Processing: Consolidating Evidence from an Electroencephalographic Index of Reward-Prediction-Error. Biological Psychology, 146, 107735. ISSN 0301-0511 [Article]

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Abstract or Description

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 Positivity (i.e. the Feedback-Related-Negativity contrasting unpredicted rewards and unpredicted non-rewards) was significantly associated with three measures of extraversion and unrelated to other basic traits from the Big Five personality model. Narrower sub-traits of extraversion showed similar, though weaker associations with the Reward Positivity. These findings consolidate previous evidence linking extraversion with a putative marker of dopaminergic reward-processing.

Item Type:	Article
Identification Number (DOI):	https://doi.org/10.1016/j.biopsycho.2019.107735
Keywords:	Extraversion, Reward Prediction Error, Reward-Positivity, Feedback Related Negativity, Dopamine
Departments, Centres and Research Units:	Psychology
Dates:	Date Event 24 July 2019 Accepted 25 July 2019 Published Online September 2019 Published
Item ID:	26701
Date Deposited:	06 Aug 2019 08:31
Last Modified:	04 Aug 2021 03:46
Peer Reviewed:	Yes, this version has been peer-reviewed.
URI:	https://research.gold.ac.uk/id/eprint/26701

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