在相互依存的群体中推广合作行为
Spreading of cooperative behaviour across interdependent groups
摘要：
最近的实证研究表明，群体之间的联系加强了群体内的个人采取合作行为。此外，网络之间的联系可能导致级联故障，竞争渗透，或有助于有效的运输。在这里，我们表明，事实上存在一个中间分数的群体之间的联系，是最佳的合作在囚徒困境游戏的演变。我们认为，个别群体与定期，随机和无标度拓扑结构，并研究他们的不同组合，以揭示一个中间的相互依赖最佳促进群体之间的合作行为的传播。过多的群体之间的联系只会使两个群体统一起来，使他们像一个人一样行动，而群体之间的联系太少则会阻碍两个群体之间有用的信息流动。有趣的是，我们发现，组间链接更有可能连接两个合作者比组内链接，从而支持的结论，他们是至关重要的。
英文摘要：
Recent empirical research has shown that links between groups reinforce individuals within groups to adopt cooperative behaviour. Moreover, links between networks may induce cascading failures, competitive percolation, or contribute to efficient transportation. Here we show that there in fact exists an intermediate fraction of links between groups that is optimal for the evolution of cooperation in the prisoner's dilemma game. We consider individual groups with regular, random, and scale-free topology, and study their different combinations to reveal that an intermediate interdependence optimally facilitates the spreading of cooperative behaviour between groups. Excessive between-group links simply unify the two groups and make them act as one, while too rare between-group links preclude a useful information flow between the two groups. Interestingly, we find that between-group links are more likely to connect two cooperators than in-group links, thus supporting the conclusion that they are of paramount importance.
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