Abstract
In traditional epistemology, psychological self-knowledge is taken to be the paradigm of privleged a priori knowledge. According to an influential incompatibilist line of thought, traditional epistemic features attributed to psychological self-knowledge are supposed to be inconsistent with content externalism. In this paper, I examine one prominent compatibilist response by an advocate of content externalism, i.e., Fred Dretske's answer tot he incompatibilist argument, based on the model of displaced perceptual knowledge. I discuss the costs and benefits of his answer.