My contribution to the first round of a tetralog with Bill Brewer, Anil Gupta, and John McDowell. Each of us has written a response to the writings of the other three philosophers on the topic "Empirical Reason". My initial contribution focuses on what we know a priori about perception. In the second round, we will each respond to the each writer's first-round contributions.

Are perceptual experiences epistemically appraisable? In this paper, I argue, contra Siegel (Rationality of perception, Oxford 2017) that they are not (§§ 2–3). I also show how the problem of hijacked experience can be solved without endorsing the view that perceptual experience is epistemically appraisable (§§ 4–5). A key idea behind my proposal is a disjunctivist view on rationalising and epistemic powers of perceptual experience.

A summary of The Rationality of Perception, and my replies to symposium papers on it by Andy Clark and Christopher Peacocke.