Prevalence of cooperation within groups of selfish individuals is puzzling in that it contradicts
with the basic premise of natural selection. Favoring players with higher fitness, the latter is …

The general belief that cooperation and altruism in social groups result primarily from kin
selection has recently been challenged, not least because results from cooperatively …

The scientific study of networks-computer, social, and biological-has received an enormous
amount of interest in recent years. However, the network approach has been applied to the …

Abstract Indirect reciprocity,,,, is a key mechanism for the evolution of human cooperation.
Our behaviour towards other people depends not only on what they have done to us but …

How cooperation emerges in human societies is both an evolutionary enigma and a
practical problem with tangible implications for societal health. Population structure has long …

The evolution of cooperation among nonrelatives has been explained by direct, indirect, and
strong reciprocity. Animals should base the decision to help others on expected future help …

Interaction among individuals is universal, both in animals and in plants, and substantially
affects evolution of natural populations and responses to artificial selection in agriculture …

When people are the victims of greed or recipients of generosity, their first impulse is often to
pay back that behavior in kind. What happens when people cannot reciprocate, but instead …

Explaining the rise and maintenance of cooperation is central to our understanding of
biological systems, and human societies,. When an individual's cooperativeness is used by …

We explore the minimal conditions for sustainable cooperation on a spatially distributed
population of memoryless, unconditional strategies (cooperators and defectors) in presence …