  The network reciprocity is an important dynamic rule fostering the emergence
of cooperation among selfish individuals. This was reported firstly in the
seminal work of Nowak and May, where individuals were arranged on the regular
lattice network, and played the prisoner's dilemma game (PDG). In the standard
PDG, one often assumes that the players have perfect rationality. However, in
reality, we human are far from rational agents, as we often make mistakes, and
behave irrationally. Accordingly, in this work, we introduce the element of
noise into the measurement of fitness, which is determined by the parameter a
controlling the degree of noise. The considered noise-induced mechanism
remarkably promotes the behavior of cooperation, which may be conducive to
interpret the emergence of cooperation within the population.
