Intermediate selection pressure bring in the emergence of altruism and common words

Many animals show altruistic behavior by using signals, such as alarm calls. However, few study have discussed the coevolution of altruistic behavior and common words among agents, although many studies have discussed how altruism have evolved. In this study we performed simulation experiments in order to explore the condition of the emergence of altruistic behavior with common words between agents who pursue their own profit. The result suggests that some kinds of altruism and common words are emerged under intermediate selection pressure and altruism can be a dominant strategy for agents under such a condition. Our results also suggest that the dynamics of resources would be one of important keys to the understanding of the emergence of altruism.