Abstract

The question I want to look at in this paper is this: To what extent does an externalist conception of mental content threaten our ability to know the contents of our thoughts? I shall argue that, in an important sense, externalism is inconsistent with the thesis that we have authoritative first-person knowledge of thought content: in particular, I shall argue, it is inconsistent with the thesis that our thought contents are epistemically transparent to us. I shall further argue that this is true in a sense that falsifies another important and traditionally fundamental view —that we can detect a priori whether our inferences are logically valid or not. I shall leave for another occasion the question whether these results reflect badly on epistemic transparency or on externalism.