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Consensus Formation and Change are Enhanced by Neutrality
Andrei Sontag1,2, Janina A Hoffmann3, Tim Rogers1
1Department of Mathematical Sciences, University of Bath, Bath, UK.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|March 22, 2026
Summary
Neutrality in group decision-making surprisingly aids consensus. It helps groups reach agreement robustly and change their minds efficiently, benefiting both animal swarms and human societies.
Area of Science:
- Collective behavior
- Decision-making science
- Social dynamics
Background:
- Collective decision-making relies on feedback loops for consensus.
- Participation varies, with individuals sometimes adopting neutral stances.
- Neutrality's role in group dynamics is not well understood.
Purpose of the Study:
- To investigate the benefits of neutrality in collective decision-making.
- To analyze how neutral individuals impact consensus formation and change.
- To provide a theoretical and experimental framework for understanding neutrality's function.
Main Methods:
- Developed a new mathematical model for collective binary decision problems.
- Conducted experimental validation with insect and human populations.
- Analyzed the impact of neutral actors on consensus dynamics.
Main Results:
- Neutrality enables robust consensus formation in groups using simple reasoning.
- Neutral actors facilitate efficient consensus change by reducing effective population size.
- Demonstrated benefits across theoretical models and empirical studies.
Conclusions:
- Neutrality offers significant, previously unrecognized advantages for collective decision-making.
- Explains how groups efficiently reach and overturn consensus.
- Suggests neutrality as an adaptive strategy in social systems.
Keywords:
collective behaviourconsensus formationdecision makingindividual‐based modelstochastic switchingMore Related Videos
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