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Collective decision-making in white-faced capuchin monkeys.

O Petit1, J Gautrais, J-B Leca

  • 1Ethologie des Primates, Département Ethologie Physiologie Ecologie, Institut Pluridisciplinaire Hubert Curien, Centre National de la Recherche Scientifique-Université de Strasbourg, 23 rue Becquerel, 67087 Strasbourg Cedex 2, France. odile.petit@c-strasbourg.fr

Proceedings. Biological Sciences
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Summary
This summary is machine-generated.

Group movement decisions in white-faced capuchins (Cebus capucinus) rely on a quorum of three followers joining the initiator. The initiator

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Area of Science:

  • Animal behavior
  • Ecology
  • Primate studies

Background:

  • Group-living animals exhibit collective movement through consensus.
  • Individual responses to a proposed direction are key to group decision-making.

Purpose of the Study:

  • To examine the temporal spread of individual responses in white-faced capuchins initiating group movement.
  • To understand the consensus decision-making mechanisms in primate group movements.

Main Methods:

  • Analysis of 294 group movement start attempts in semi-free ranging white-faced capuchins.
  • Application of a modeling approach to analyze decision-making dynamics.

Main Results:

  • Group movement consensus involves mimetic joining and initiator's cancellation rate.
  • Cancellation rate decreases as follower numbers increase, establishing a quorum of three.
  • Initiator's abandonment influences follower behavior, which in turn affects the initiator.

Conclusions:

  • Consensus decision-making in capuchins is a synergistic process between initiator behavior and self-organized mechanisms.
  • A quorum of three followers is critical for successful collective movement initiation.
  • The study highlights the interplay between individual decisions and emergent group behavior.