Abstract

Broadly speaking, there are two different ways in which one might defend skepticism – an a priori way and an empirical way. My first task in this paper is to defend the view that the preferred way to defend skepticism is empirical. My second task is to explain why this approach actually makes sense. I accomplish this latter task by responding to various criticisms one might advance against the possibility of empirically defending skepticism. In service of this response, I distinguish between two different kinds of hallucination, ‘metaphysical’ and ‘ordinary’, and seek to clarify the notion of a ‘presupposition’.