Impact of conformity on the evolution of cooperation in the prisoner's dilemma game

► Evolutionary model of the prisoner's dilemma game considering conformism. ► Conformity follows a signal process when the temptation to defect is low. ► Conformity follows a dual process when the temptation to defect is large. ► Proportion rather than group size is important for the evolution of cooperation. ► Explanation of why a higher-than-expected level of cooperation exists in real life.