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This paper introduces a generic agent-basedmodel simulating the exchange and the di usion of pro andconarguments. It is applied to the caseof thedi usionof vegetariandiets in the context of apotential emergence of a second nutrition transition. To this day, agent-based simulation has been extensively used to study opinion dynamics. However, the vast majority of existing models have been limited to extremely abstract and simplified representations of the di usion process. These simplifications impairs the realismof the simulations and disables the understanding of the reasons for the shi of an actor’s opinion. The generic model presented here explicitly represents exchanges of arguments between actors in the context of an opinion dynamicmodel. In particular, the inner attitude towards an opinion of each agent is formalized as an argumentation graph and each agent can share arguments with other agents. Simulation experiments show that introducing attacks between arguments and a limitation of the number of arguments mobilized by agents has a strong impact on the evolution of the agents’ opinion. We also highlight that when a new argument is introduced into the system, the quantity and the profile of the agents receiving the new argument will impact the evolution of the overall opinion. Finally, the application of thismodel to vegetarian diet adoption seems consistent with historical food behaviour dynamics observed during crises.

jasss

Introducing the Argumentation Framework Within Agent-Based Models to Better Simulate Agents' Cognition in Opinion Dynamics: Application to Vegetarian Diet Diffusion