• Descartes’s Anti-Transparency and the Need for Radical Doubt
    Ergo: An Open Access Journal of Philosophy 5 1083-1129. 2018.
    Descartes is widely portrayed as the arch proponent of “the epistemological transparency of thought” (or simply, “Transparency”). The most promising version of this view—Transparency-through-Introspection—says that introspecting (i.e., inwardly attending to) a thought guarantees certain knowledge of that thought. But Descartes rejects this view and provides numerous counterexamples to it. I argue that, instead, Descartes’s theory of self-knowledge is just an application of his general theory of …Read more
  • Cartesian Clarity
    Philosophers' Imprint 20 (19): 1-28. 2020.
    Clear and distinct perception is the centrepiece of Descartes’s philosophy — it is the source of all certainty — but what does he mean by ‘clear’ and ‘distinct’? According to the prevailing approach, what it means for a perception to be clear is that its content has a certain objective property, like truth. I argue instead that clarity is at least partly a subjective, phenomenal quality whereby a content is presented as true to the perceiving subject. Clarity comes in degrees. Any weak degree of…Read more
  • Inductive Knowledge
    Noûs 54 (2): 354-388. 2018.
    This paper formulates some paradoxes of inductive knowledge. Two responses in particular are explored: According to the first sort of theory, one is able to know in advance that certain observations will not be made unless a law exists. According to the other, this sort of knowledge is not available until after the observations have been made. Certain natural assumptions, such as the idea that the observations are just as informative as each other, the idea that they are independent, and that th…Read more
  • The Conflict of Evidence and Coherence
    Philosophy and Phenomenological Research 96 (1): 3-44. 2018.
    For many epistemologists, and for many philosophers more broadly, it is axiomatic that rationality requires you to take the doxastic attitudes that your evidence supports. Yet there is also another current in our talk about rationality. On this usage, rationality is a matter of the right kind of coherence between one's mental attitudes. Surprisingly little work in epistemology is explicitly devoted to answering the question of how these two currents of talk are related. But many implicitly assum…Read more
  • The number sense represents (rational) numbers
    Behavioral and Brain Sciences 44 1-57. 2021.
    On a now orthodox view, humans and many other animals possess a “number sense,” or approximate number system, that represents number. Recently, this orthodox view has been subject to numerous critiques that question whether the ANS genuinely represents number. We distinguish three lines of critique – the arguments from congruency, confounds, and imprecision – and show that none succeed. We then provide positive reasons to think that the ANS genuinely represents numbers, and not just non-numerica…Read more
  • The Epistemic Role of Consciousness
    Oxford University Press. 2019.
    What is the role of consciousness in our mental lives? Declan Smithies argues here that consciousness is essential to explaining how we can acquire knowledge and justified belief about ourselves and the world around us. On this view, unconscious beings cannot form justified beliefs and so they cannot know anything at all. Consciousness is the ultimate basis of all knowledge and epistemic justification.
  • Transparency and Self-Knowledge
    Oxford University Press. 2018.
    You know what someone else is thinking and feeling by observing them. But how do you know what you are thinking and feeling? This is the problem of self-knowledge: Alex Byrne tries to solve it. The idea is that you know this not by taking a special kind of look at your own mind, but by an inference from a premise about your environment.
  • Can Pragmatists Be Moderate?
    Philosophy and Phenomenological Research 102 (3): 531-558. 2021.
    In discussions of whether and how pragmatic considerations can make a difference to what one ought to believe, two sets of cases feature. The first set, which dominates the debate about pragmatic reasons for belief, is exemplified by cases of being financially bribed to believe (or withhold from believing) something. The second set, which dominates the debate about pragmatic encroachment on epistemic justification, is exemplified by cases where acting on a belief rashly risks some disastrous out…Read more