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The dynamical origin of opinion polarization in the real world is aninteresting topic physical scientists may help to understand. To properly modelthe dynamics, the theory must be fully compatible with findings by socialpsychologists on microscopic opinion change. Here we introduce a generic modelof opinion formation with homogeneous agents based on the well-known socialjudgment theory in social psychology by extending a similar model proposed byJager and Amblard. The agents' opinions will eventually cluster around extremeand/or moderate opinions forming three phases in a two-dimensional parameterspace that describes the microscopic opinion response of the agents. Thedynamics of this model can be qualitatively understood by mean-field analysis.More importantly, first-order phase transition in opinion distribution isobserved by evolving the system under a slow change in the system parameters,showing that punctuated equilibria in public opinion can occur even in a fullyconnected social network.

Social Judgment Theory Based Model On Opinion Formation, Polarization And Evolution