Philosophical Studies

, Volume 135, Issue 2, pp 179–197 | Cite as

Conditionalization, Reflection, and Self-Knowledge

  • Jonathan Weisberg


Van Fraassen famously endorses the Principle of Reflection as a constraint on rational credence, and argues that Reflection is entailed by the more traditional principle of Conditionalization. He draws two morals from this alleged entailment. First, that Reflection can be regarded as an alternative to Conditionalization – a more lenient standard of rationality. And second, that commitment to Conditionalization can be turned into support for Reflection. Van Fraassen also argues that Reflection implies Conditionalization, thus offering a new justification for Conditionalization.

I argue that neither principle entails the other, and thus neither can be used to motivate the other in the way van Fraassen says. There are ways to connect Conditionalization to Reflection, but these connections depend on poor assumptions about our introspective access, and are not tight enough to draw the sorts of conclusions van Fraassen wants. Upon close examination, the two principles seem to be getting at two quite independent epistemic norms.


Credence Function Principal Principle Order Credence Conditional Credence Traditional Principle 
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  1. Arntzenius, F. (2003): ‘Some Problems for Conditionalization and Reflection’, Journal of Philosophy C.7Google Scholar
  2. Elga, A. (2000): ‘Self-Locating Belief and the Sleeping Beauty Problem’, Analysis 60Google Scholar
  3. Lewis, D. (1980): ‘A Subjectivist’s Guide to Objective Chance.’ Studies in Inductive Logic and Probability, IIGoogle Scholar
  4. Van Fraassen, B. (1984): ‘Belief and the Will’, The Journal of Philosophy 81Google Scholar
  5. Van Fraassen, B. (1995): ‘Belief and the Problem of Ulysses and the Sirens’, Philosophical Studies 77Google Scholar
  6. Van Fraassen, B. (1999): ‘Conditionalization: a New Argument For’, Topoi␣18Google Scholar
  7. Williamson, T. (2000): Knowledge and its Limits, Oxford University PressGoogle Scholar

Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  1. 1.Rutgers UniversityNew BrunswickUSA

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