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SYOF: Symposium Dynamics of Opinion Formation – From Quorum Sensing to Polarization

SYOF 1: Dynamics of Opinion Formation – From Quorum Sensing to Polarization

SYOF 1.4: Invited Talk

Monday, March 27, 2023, 11:15–11:45, HSZ 01

A yet undetected cognitive bias, revealed by opinion dynamics simulations — •Guillaume Deffuant — Université Clermont Auvergne, INRAE, UR LISC, Aubière, France

In the first part of the talk, I consider a recent opinion dynamics model in which the agents hold opinions about each other. The simulations of this model show surprising patterns. When agents do not gossip, the average opinion tends to increase and then to remain at a high value. When agents gossip, the average opinion tends to decrease and then to stabilise at a negative value. The mathematical analysis shows that a positive bias on the self-evaluation appears in the model and plays a crucial role in the pattern emergence. In the second part of the talk, I present an experiment that provides evidence supporting the existence of a similar positive bias in human subjects. I argue that this bias is different from the well-known positive bias from self-enhancement and was yet undetected.