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Assessing joint commitment as a process in great apes.

Raphaela Heesen1,2, Adrian Bangerter1, Klaus Zuberbühler3,4

  • 1Institute of Work and Organizational Psychology, University of Neuchâtel, Switzerland.

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|September 2, 2021
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Summary
This summary is machine-generated.

Chimpanzees and bonobos show coordinated entry and exit phases in social interactions, similar to humans. This suggests joint commitment processes existed in our shared ancestors.

Keywords:
Behavioral neuroscienceBiological sciencesEthology

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Area of Science:

  • Primate behavior
  • Comparative psychology
  • Evolutionary anthropology

Background:

  • Social animals engage in joint activities, but humans uniquely possess joint commitment.
  • Joint commitment is understood as a mental state and a dynamic process evident in action coordination.
  • Entry and exit phases of joint action reveal coordination efforts.

Purpose of the Study:

  • To investigate the presence and duration of entry and exit phases in chimpanzee and bonobo social interactions.
  • To explore whether these phases indicate a process analogous to human joint commitment.
  • To compare these phases between chimpanzees and bonobos, considering factors like rank and friendship.

Main Methods:

  • Analysis of 1,242 natural play and grooming interactions of captive chimpanzees and bonobos.
  • Observation and recording of mutual gaze and communicative signals during interaction phases.
  • Comparative analysis of coordination efforts in entry and exit phases.

Main Results:

  • Chimpanzees and bonobos exhibited frequent mutual gaze and communicative signals during entry and exit phases of joint activities.
  • These phases were comparable to those observed in human joint activities.
  • Friendship moderated interaction phases more in bonobos than in chimpanzees, unlike rank effects.

Conclusions:

  • The findings suggest that the process of joint commitment, characterized by coordinated entry and exit phases, was present in the last common ancestor of humans and Pan.
  • Bonobos' social interactions may reflect patterns analogous to human "face management" more than chimpanzees.
  • This study provides evidence for the evolutionary roots of joint commitment in great apes.