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Processes of individual attitude formation and their macroscopic consequenceshave become an intriguing research topic, and agent-based models of opinionformation have been proposed to understand this phenomenon. This studyconducted an agent-based simulation and examined the role of mass media in anoisy opinion formation process, where opinion heterogeneity is preserved by aweak intensity of assimilation and errors accompanying opinion modifications.In a computational model, agents conformed to their neighbours' opinions insocial networks. In addition, each agent tended to be influenced by one of atwo external agents with fixed opinions, that is, mass media that take oppositepositions on an opinion spectrum. The simulation results demonstrated that asmall probability of interactions with mass media reduces opinion heterogeneityeven with extreme mass media position values. However, a large frequency ofinteractions with mass media increases opinion heterogeneity. Accordingly,intermediate assimilation strength achieves the least heterogeneous opiniondistribution. The influence of mass media dampens the effects of networktopology. Our simulation implies that mass media can play qualitativelydifferent roles depending on their positions and intensity of influence.

A noisy opinion formation model with two opposing mass media