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Warrant: The Current Debate$
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Alvin Plantinga

Print publication date: 1993

Print ISBN-13: 9780195078626

Published to Oxford Scholarship Online: November 2003

DOI: 10.1093/0195078624.001.0001

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Bayesian Coherentism and Rationality

Bayesian Coherentism and Rationality

Chapter:
(p.132) 7 Bayesian Coherentism and Rationality
Source:
Warrant: The Current Debate
Author(s):

Alvin Plantinga (Contributor Webpage)

Publisher:
Oxford University Press
DOI:10.1093/0195078624.003.0007

Rationality, although distinct from warrant, is a notion both interesting in its own right and important for a solid understanding of warrant. In this chapter, I first disambiguate at least five different forms of rationality, and, second, examine the relationship between Bayesianism and rationality (in its different forms or senses). Bayesians often claim that conformity to Bayesian constraints (such as coherence, changing belief by conditionalization or probability kinematics, or van Fraassen's Reflection) is necessary for rationality. Against this view, I argue that (1) none of the forms of rationality I distinguished requires coherence, and some of them in fact require incoherence, and that (2) changing belief by conditionalization (or by probability kinematics) is neither a sensible ideal for human cognizers nor a requirement for rationality. Finally, after a somewhat extended look at Reflection, I argue that (3) while van Fraassen surely has important and probably true things to say about what rational integrity requires with respect to one's commitments and intentions about belief change, it is nonetheless the case that rationality does not require that I conform to Reflection.

Keywords:   Bayesianism, coherence, coherentism, conditionalization, van Fraassen, probability kinematics, rationality, Reflection, warrant

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