Group decision-making in animal societies
Individuals need to coordinate their activities to benefit from group living. Thus group decisions are essential for societies, especially if group members cooperate with each other. Models show that…
Decision accuracy in complex environments is often maximized by small group sizes
- Environmental ScienceProceedings of the Royal Society B: Biological Sciences
It is revealed that, counterintuitively, it is the noise inherent in these small groups that enhances their accuracy, allowing individuals in such groups to avoid the detrimental effects of correlated information while exploiting the benefits of collective decision-making.
Both information and social cohesion determine collective decisions in animal groups
- PsychologyProceedings of the National Academy of Sciences
It is demonstrated how multiple informational dimensions are integrated within groups to achieve consensus, even though no individual is explicitly aware of or has a unique preference for, the consensus option.
Decision-making in pigeon flocks: a democratic view of leadership
- PsychologyJournal of Experimental Biology
It is suggested that as in human groups, starting from a central position is more effective as it allows leaders to not only transmit their own information but also to average the tendencies of the other group members.
Information Certainty Determines Social and Private Information Use in Ants
- EconomicsScientific Reports
It is shown that in house-hunting ant colonies, individuals fine-tune the parameters of their quorum responses depending on their private knowledge: informed ants evaluating a familiar new nest rely relatively more on social than private information when the certainty of their private information is low, and vice versa.
Self-Improvement for Team-Players: The Effects of Individual Effort on Aggregated Group Information
- EconomicsPloS one
A model where group members are able to improve their personal likelihood of making a correct decision by conducting some level of (costly) effort is developed, demonstrating that there is an evolutionarily stable level of effort for all the individuals within the group, and the effort made by an individual should decrease with increasing group size.
Dynamic choices are most accurate in small groups
- EconomicsTheoretical Ecology
It is suggested that re-evaluation dynamics can make small and very large groups optimal, and features that may be seen as limitations, like an influence from only a small number of individuals, may turn to be beneficial when considering local animal interactions.
Collective Learning and Optimal Consensus Decisions in Social Animal Groups
- PsychologyPLoS Comput. Biol.
How learning as part of a collective results in behavior that is fundamentally different from that learned in isolation, allowing grouping organisms to spontaneously detect correlations between group members' observations of environmental cues, adjust strategy as a function of changing group size, and achieve a decision accuracy that is very close to that which is provably optimal, regardless of environmental contingencies.
Optimal use of simplified social information in sequential decision-making
- EconomicsJournal of the Royal Society Interface
The results show that agents can employ highly effective social decision-making rules without requiring unrealistic cognitive capacities, and indicate likely ecological variation in the social information different animals attend to.
Quorums enable optimal pooling of independent judgements
- Computer SciencebioRxiv
It is shown that majority voting is frequently sub-optimal, and can be optimally replaced by quorum decision-making, which helps explain the prevalence of quorum-sensing in even the simplest collective systems, such as bacterial communities.
SHOWING 1-10 OF 30 REFERENCES
Quorum responses and consensus decision making
- MathematicsPhilosophical Transactions of the Royal Society B: Biological Sciences
A simple mathematical model is developed to show the central importance to speedy and accurate decisions of quorum responses, in which an animal's probability of exhibiting a behaviour is a sharply nonlinear function of the number of other individuals already performing this behaviour.
Effective leadership and decision-making in animal groups on the move
It is revealed that the larger the group the smaller the proportion of informed individuals needed to guide the group, and that only a very small proportion ofinformed individuals is required to achieve great accuracy.
When to use social information: the advantage of large group size in individual decision making
- PsychologyBiology Letters
A simple modelling approach is used in which individual decisions based upon social information are more likely to be correct when more individuals are involved and their personal information is more accurate.
Collegial decision making based on social amplification leads to optimal group formation.
- EconomicsProceedings of the National Academy of Sciences of the United States of America
This experimental and theoretical study of shelter selection by cockroach groups demonstrates that choices can emerge through nonlinear interaction dynamics between equal individuals without perfect knowledge or leadership.
Quorum decision-making facilitates information transfer in fish shoals
- BiologyProceedings of the National Academy of Sciences
It is shown that effective and accurate information transfer in groups may be gained only through nonlinear responses of group members to each other, thus highlighting the importance of quorum decision-making.
Foraging nine-spined sticklebacks prefer to rely on public information over simpler social cues
It is argued that it is because nine-spined sticklebacks preferentially base decisions on public information rather than social cues that they can potentially avoid engaging in erroneous informational cascades and help social animals make adaptive decisions.
Public Information: From Nosy Neighbors to Cultural Evolution
A large body of evidence suggests that human decision-making is strongly influenced by the behavior of others, which may then affect biological evolution.
Note on the drawing power of crowds of different size.
This study reports on the relationship between the size of a stimulus crowd, standing on a busy city street looking up at a building, and the response of passersby. As the size of the stimulus crowd…
A tunable algorithm for collective decision-making
- Computer ScienceProceedings of the National Academy of Sciences
This work shows that emigrating colonies of the ant Temnothorax curvispinosus tune the parameters of a single decision algorithm to respond adaptively to two distinct problems: rapid abandonment of their old nest in a crisis and deliberative selection of the best available new home when theirold nest is still intact.