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. (shrink)

is tendentious. (Throughout this paper I shall refer to this claim as.

If the contents of our thoughts are partly determined by facts outside our heads, can we still know those contents directly, without investigating our environment? What if we were surreptitiously switched to Twin-Earth? Would we know the contents of our thoughts under these unusual circumstances? By looking carefully at what determines the content of a second-order thought, a candidate for self-knowledge, the paper argues that we can know the contents of our thoughts directly, even after being switched. Learning about the (...) switch, however, does raise some interesting difficulties. (shrink)

This paper argues that, given a certain apparently inevitable thesis about content, we could not know our own minds. The thesis is that the content of a thought is determined by its relational properties.