We present an abstract model of rationality that focuses on structural properties of attitudes. Rationality requires coherence between your attitudes, such as your beliefs, values, and intentions. We define three 'logical' conditions on attitudes: consistency, completeness, and closedness. They parallel the familiar logical conditions on beliefs, but contrast with standard rationality conditions like preference transitivity. We establish a formal correspondence between our logical conditions and standard rationality conditions. Addressing John Broome's programme 'rationality through reasoning', we formally characterize how you can (...) (not) become more logical by reasoning. Our analysis connects rationality with logic, and enables logical talk about multi-attitude psychology. (shrink)

Many epistemologists agree that there are things we epistemically shouldn’t believe, i.e., that we have negative epistemic duties. But it is a matter of controversy whether we have any positive epistemic duties, i.e., whether we epistemically should have certain beliefs. In this paper, I argue that, in certain cases in which one acquires counterevidence against what one believes (p), one epistemically should give up one's belief by reasoning in a way that involves forming a belief in its negation (in not-p). (...) In these cases, one epistemically should believe not-p and thus has a positive epistemic duty. I reinforce this argument by showing how our negative epistemic duties depend on our facts about how we should reason. I go on to argue for positive epistemic duties in other cases, including ones in which one trying to make up one’s mind. (shrink)

This essay defends an account of what things are assessable for reasonableness and why. On this account, something is assessable for reasonableness if and only if and because it is the functional effect of critical reasoning.

People reason not only in beliefs, but also in intentions, preferences, and other attitudes. They form preferences from existing preferences, or intentions from existing beliefs and intentions, and so on. This often involves choosing between rival conclusions. Building on Broome (Rationality through reasoning, Hoboken, Wiley. https://doi.org/10.1002/9781118609088, 2013) and Dietrich et al. (J Philos 116:585–614. https://doi.org/10.5840/jphil20191161138, 2019), we present a philosophical and formal analysis of reasoning in attitudes, with or without facing choices in reasoning. We give different accounts of choosing, in (...) terms of a conscious activity or a partly subconscious process. Reasoning in attitudes differs fundamentally from reasoning _about_ attitudes, a form of theoretical reasoning in which one discovers rather than forms attitudes. We show that reasoning in attitudes has standard formal properties (such as monotonicity), but is indeterministic, reflecting choice in reasoning. Like theoretical reasoning, it need not follow logical entailment, but for a more radical reason, namely indeterminism. This makes reasoning in attitudes harder to model logically than theoretical reasoning. But it can be studied abstractly, using indeterministic consequence operators. (shrink)

It is a platitude that when we reason, we often take things for granted, sometimes even justifiably so. The chemist might reason from the fact that a substance turns litmus paper red to that substance being an acid. In so doing, they take for granted, reasonably enough, that this test for acidity is valid. We ordinarily reason from things looking a certain way to their being that way. We take for granted, reasonably enough, that things are as they look Although (...) it is a platitude that we often take things for granted when we reason—whether justifiably or not—one might think that we do not have to. In fact, it is a natural expectation that were we not pressed by time, lack of energy or focus, we could always in principle make explicit in the form of premises every single presupposition we make in the course of our reasoning. In other words, it is natural to expect it to be true that presuppositionless reasoning is possible. In this essay, I argue that it is false: presuppositionless reasoning is impossible. Indeed, I think this is one of the lessons of a long-standing paradox about inference and reasoning known as Lewis Carroll’s (1985) regress of the premises. Many philosophers agree that Carroll’s regress teaches us something foundational about reasoning. I part ways about what it is that it teaches us. What it teaches us is that the structure of reasoning is constitutively presuppositional. (shrink)

In these comments on David Hunter’s insightful new book On Believing, I consider Hunter’s account of believing that p as being in a position to act in light of the fact (or apparent fact) that p. After investigating how this kind of view is supposed to work, I raise a challenge for it: the account is unlikely to generalize to other attitudes like hoping and fearing that p. I then argue that this really is an objection to the account of (...) believing, since all the attitudes have so many fundamental features in common that there should be a common core to the accounts of all the different attitudes. Since hoping and fearing that p in no way even commit the speaker to the belief that p, they can’t allow the agent to act in light of the (apparent) fact that p. Thus, I conclude, believing isn’t a matter of being in such a position, and neither is the having of any other type of attitude. (shrink)