Role of influence-induced dynamic link weight adjustment in the cooperation of spatial prisoner’s dilemma game

Abstract

We propose a novel dynamic link weight adjustment model, in which link weights on static network will be dynamically adjusted according to agents' influence during the evolutionary process. To be specific, when an agent's strategy is learned by one of his direct neighbors, his influence will be expanded by one unit β. Then link weights between agents will be adaptively adjusted by counting the influence of agents. Meanwhile, we utilize a variable δ to control the range of link weights, that is, link weights can only be limited within the interval [1 − δ, 1 + δ]. In our model, it should be noted that link weights between agents will be integrated into the fitness calculation process. Through abundant simulations, the results indicate that the newly proposed model can significantly foster the persistence and emergence of cooperation. In addition, when the cost-to-benefit ratio u is quite small, the level of cooperation will increase with the augmentation of δ. However, when the cost-to-benefit ratio u exceeds a certain value, the level of cooperation increases at the early stage and then decreases with the growth of δ. As for the potential reasons, we observe that it is closely related to the type of connections, in which the cooperation can flourish once C − C type links dominate the system, while other types will hamper the evolution of cooperation. Taking together, the current model and results will provide some insights into the collective cooperation within the human population.

Evolution of cooperation under the aspiration-based interactive diversity in the spatial prisoner's dilemma game

“…Over the past few decades, evolutionary game theory has provided a powerful framework to address the evolution of cooperation [10][11][12][13][14][15][16][17]. In order to better investigate the cooperative behavior within the selfish population, many mechanisms have been proposed, such as reputation [18][19][20][21], reward [22,23], punishment [24][25][26], memory [27][28][29], migration [30][31][32][33], noise [34][35][36], interactive Inspired by the daily lifestyle, an individual may take different ways or attitudes towards his friends.…”