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A Conflict Model of Reward-seeking Behavior in Male Rats
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Third-party punishment-like behavior in a rat model.

Kanta Mikami1, Yuka Kigami1, Tomomi Doi1

  • 1Department of Molecular and Cellular Physiology, Ehime University Graduate School of Medicine, Shitsukawa, Toon, Ehime, 791-0295, Japan.

Scientific Reports
|September 27, 2024
PubMed
Summary

Third-party punishment (TPP) is not innate but acquired. Affectionately raised rats showed TPP-like behaviors, intervening in aggression and aiding distressed pups, unlike normally reared rats.

Keywords:
BehaviorMoralityPrefrontal cortexTriageWistar

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Area of Science:

  • Animal Behavior
  • Comparative Psychology
  • Evolutionary Biology

Background:

  • Third-party punishment (TPP) is considered a crucial, innate human trait for societal morality.
  • Existing research suggests TPP is unique to humans and evolutionarily conserved.

Purpose of the Study:

  • To investigate the presence of TPP-like behaviors in non-human animals, specifically male Wistar rats.
  • To determine if TPP is an innate behavior or an acquired trait influenced by environmental factors.

Main Methods:

  • Male mature Wistar rats were observed for TPP-like responses to witnessed aggression between unfamiliar mice.
  • Rats were divided into two groups: normally reared and those reared with extensive affectionate human handling.
  • Behavioral responses, including intervention in aggression and aid to distressed pups, were recorded and compared between groups.

Main Results:

  • Normally reared rats did not exhibit TPP-like behaviors.
  • Rats with affectionate handling showed reduced aggression towards aggressors and intervened in aggressive encounters.
  • Handled rats demonstrated increased prosocial behaviors, such as aiding drowning or comatose rat pups, compared to controls.

Conclusions:

  • TPP may not be exclusively human or innate, but rather an acquired behavior.
  • Affectionate rearing conditions appear to foster the development of TPP-like and prosocial behaviors.
  • This suggests that environmental factors, particularly early social experiences, play a significant role in the emergence of altruistic behaviors.