The Space of Reasons 2007-04-26

Boghossian-Style Incompatibilism (Part 1)

Arguments against the compatibility of a priori self-knowledge and content externalism (henceforth, C-externalism) typically fall under one of two headings. First, there is the achievement problem, according to which C-externalism entails that a subject can only come to know the content of her thoughts by examining her environment, and the consequence problem, the charge that C-externalism (when combined with privileged self-knowledge) implies that a subject may have a priori knowledge of empirical facts about her environment.I will begin with an examination of the achievement problem. Roughly, the achievement problem may be put as follows: C-externalist thought experiments seem to demonstrate that given an appropriate difference in the external world, there will be a difference in thought content, without this difference being reflected in any inner detectable manner. This seems to imply that one cannot tell, without consulting the external world, ...

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