Reasons for (prior) belief in Bayesian epistemology

Franz Dietrich (1, 2) , Christian List (3)

1 CERSES - UMR 8137 - Centre de recherche sens, ethique, société
2 CES - Centre d'économie de la Sorbonne
3 LSE - London School of Economics and Political Science

Bayesian epistemology tells us with great precision how we should move from prior to posterior beliefs in light of new evidence or information, but says little about where our prior beliefs come from. It o§ers few resources to describe some prior beliefs as rational or well-justiÖed, and others as irrational or unreasonable. A di§erent strand of epistemology takes the central epistemological question to be not how to change oneís beliefs in light of new evidence, but what reasons justify a given set of beliefs in the Örst place. We o§er an account of rational belief formation that closes some of the gap between Bayesianism and its reason-based alternative, formalizing the idea that an agent can have reasons for his or her (prior) beliefs, in addition to evidence or information in the ordinary Bayesian sense. Our analysis of reasons for belief is part of a larger programme of research on the role of reasons in rational agency (Dietrich and List 2012a,b).

Mots clés: Bayesian epistemology; doxastic reasons; prior and posterior beliefs; principle of insu¢ cient reason; belief formation; belief change

Domaines: Economies et finances; Philosophie; Psychologie

Franz Dietrich, Christian List. Reasons for (prior) belief in Bayesian epistemology. Synthese, 2013, 190, pp.787-808. ⟨10.1007/s11229-012-0224-6⟩. ⟨halshs-00978005⟩