Logical dynamics of belief change in the community

• Autores: Fenrong Liu, Jeremy Seligman, Patrick Girard
• Localización: Synthese, ISSN-e 1573-0964, Vol. 191, Nº. 11, 2014, págs. 2404-2431
• Idioma: inglés
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• Resumen

  • In this paper we explore the relationship between norms of belief revision that may be adopted by members of a community and the resulting dynamic properties of the distribution of beliefs across that community. We show that at a qualitative level many aspects of social belief change can be obtained from a very simple model, which we call �threshold influence�. In particular, we focus on the question of what makes the beliefs of a community stable under various dynamical situations. We also consider refinements and alternatives to the �threshold� model, the most significant of which is to consider changes to plausibility judgements rather than mere beliefs. We show first that some such change is mandated by difficult problems with belief-based dynamics related to the need to decide on an order in which different beliefs are considered. Secondly, we show that the resulting plausibility-based account results in a deterministic dynamical system that is non-deterministic at the level of beliefs.