Consensus or Deadlock? Consequences of Simple Behavioral Rules for Coordination in Group Decisions

PloS One
Helen F McCreerySamuel Flaxman

Abstract

Coordinated collective behaviors often emerge from simple rules governing the interactions of individuals in groups. We model mechanisms of coordination among ants during cooperative transport, a challenging task that requires a consensus on travel direction. Our goal is to determine whether groups following simple behavioral rules can reach a consensus using minimal information. Using deterministic and stochastic models, we investigate behavioral factors that affect coordination. We define and investigate three types of behavioral rules governing individual behavior that differ in the information available: individuals either 1) have no information, 2) can measure transport success, or 3) measure success while also knowing whether they are aligned with the majority. We find that groups break deadlocks only if individuals more readily give up when they are going against the majority, corresponding to rule type 3 -such groups are "informed." These behavioral rules succeed through positive and negative feedbacks that are implemented in our model via a single mechanism: individuals only need to measure the relative group sizes to make effective decisions. We also find that groups reach consensus more quickly if they have either a ...Continue Reading

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Citations

Feb 15, 2019·The Journal of Experimental Biology·Grant Navid Doering, Stephen C Pratt
Jun 18, 2017·Physical Review. E·Andreagiovanni ReinaThomas Bose

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