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Studying Food Reward and Motivation in Humans
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Exercising self-control increases responsivity to hedonic and eudaimonic rewards.

Chengli Huang1, Zhiwei Zhou1, Douglas J Angus2

  • 1Centre for Research on Self and Identity, School of Psychology, University of Southampton, Southampton SO17 1BJ, United Kingdom.

Social Cognitive and Affective Neuroscience
|January 30, 2025
PubMed
Summary

Exercising self-control amplifies reward responsivity, indicated by a larger neural marker called Reward Positivity (RewP). This effect is domain-general, applying to both personal and charitable rewards.

Keywords:
efforteudaimonic rewardshedonic rewardsreward positivityself-control

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Area of Science:

  • Neuroscience
  • Psychology
  • Cognitive Science

Background:

  • The reward responsivity hypothesis suggests self-control is aversive, leading to increased reward-seeking behavior to restore a positive baseline.
  • Effortful self-control has been previously linked to heightened reward responsivity.

Purpose of the Study:

  • To investigate whether exercising self-control enhances a neural marker of reward responsivity, the Reward Positivity (RewP).
  • To examine if this enhancement differs for hedonic (personal) versus eudaimonic (charitable) rewards.

Main Methods:

  • 114 participants completed a Stroop task, involving conditions requiring self-control (incongruent trials) and not (congruent trials).
  • Electroencephalography (EEG) recorded neural activity, specifically the Reward Positivity (RewP) during opportunities to win hedonic or eudaimonic rewards.
  • Participants had chances to win money for themselves (hedonic) or a charity (eudaimonic).

Main Results:

  • A larger RewP was observed following self-control exertion compared to when self-control was not exercised.
  • Participants showed a significantly larger RewP for hedonic rewards compared to eudaimonic rewards.
  • No interaction was found between self-control condition and reward type on RewP, indicating a domain-general effect.

Conclusions:

  • The findings support the reward responsivity hypothesis by demonstrating a neurophysiological mechanism where self-control increases reward responsivity.
  • Self-control enhances Reward Positivity (RewP) in a manner that is not specific to the type of reward (hedonic or eudaimonic).
  • This research provides a neural basis for understanding how self-control influences reward processing and motivation.