Reward is an effective mechanism that promotes cooperation. However, an individual usually reward her opponents in certain cases. Inspired by this, a conditional neutral reward mechanism has been introduced. In detail, an individual will reward his or her neighbors with the same strategy when the payoff of the focal one is higher than that of his or her neighbors. And simulations are conducted to investigate the impact of our mechanism on the evolution of cooperation. Interestingly, cooperation can survive and dominate the system. Nominal antisocial reward that defectors reward each other is rarely because of the greed of defectors. By contrast, cooperators inside the cooperative clusters share the payoff with cooperators on the boundary so that the latter can form shields to protect cooperators.

奖励是促进合作的有效机制。但是，在某些情况下，个人通常会奖励对手。受此启发，引入了有条件的中性奖励机制。详细地，当关注者的回报高于其邻居的回报时，个人将以相同的策略奖励其邻居。并进行了仿真，以研究我们的机制对合作演变的影响。有趣的是，合作可以生存并控制整个系统。背叛者互相奖励的名义上的反社会奖励很少是因为背叛者的贪婪。相比之下，合作社集群内部的合作者与边界上的合作者共享收益，以便后者可以形成保护合作者的屏障。