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Hyperthymic temperament predicts neural responsiveness for monetary reward.

Yukiko Ogura1, Yumi Wakatsuki2, Naoki Hashimoto3

  • 1Graduate School of Information Science and Technology, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.

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Hyperthymic temperament, a cheerful disposition, shows a protective effect against depression by influencing neural reward system activity. This study explored its neurobiological basis in healthy individuals.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Temperament Research

Background:

  • Hyperthymic temperament is associated with cheerfulness and may protect against depressive symptoms.
  • Diminished reward responsiveness in depression is linked to hyperthymic temperament.
  • Neurobiological underpinnings of hyperthymic temperament are underexplored.

Purpose of the Study:

  • Investigate the relationship between hyperthymic temperament and neural responsiveness to monetary rewards.
  • Explore brain regions modulated by hyperthymic temperament during reward anticipation.

Main Methods:

  • Healthy participants underwent functional magnetic resonance imaging (fMRI) during a monetary incentive delay task.
  • Examined brain activity in reward system regions in relation to hyperthymic temperament scores.

Main Results:

  • Reward anticipation activated brain reward system areas.
  • Hyperthymic temperament positively predicted activation in the left thalamus and left putamen.
  • Ventral striatum and right insula activation were not modulated by hyperthymic temperament.

Conclusions:

  • A neurobiological basis for the antidepressant effect of hyperthymic temperament was identified within the reward system.
  • Findings suggest hyperthymic temperament influences attentional, motor, or behavioral selection related to reward, not value representation.