Abstract

It has been disputed whether an externalist conception of the individuation of intentional states, such as beliefs and desires, is compatible with self-knowledge, that is, the claim that one's judgments about one's intentional states are non-evidential, non-inferential, and authoritative. I want to argue that these theses are indeed incompatible, notwithstanding an important objection to this incompatibility claim. The worry has been raised that if externalism is true, then for a subject to know, say, that he or she believes that p, the subject would need to know, on the basis of some evidence, the external conditions which determine the belief's content. Thus, externalism would be incompatible with self-knowledge. But many philosophers have accepted an objection suggesting that this worry is mistaken because in order to have a belief one need not know the metaphysical conditions determining its content, even if they are externalist. And thus, the subject's reflexive judgment about the belief would not need to rest on evidence about those external conditions. But this objection rests on a crucial assumption according to which mental content is reflexively transparent in the sense that a subject could not judge that she or he has an intentional state and be mistaken about the content of her or his state, even if the content is externally determined. My main purpose is not reflexively transparent on the assumption of externalism and, thus, self-knowledge and externalism are incompatible.