Online research in philosophy

On Hume’s account of motivation, beliefs and desires are very di¤erent kinds of propositional attitudes. Beliefs are cognitive attitudes, desires emotive ones. An agent’s belief in a proposition captures the weight he or she assigns to this proposition in his or her cognitive representation of the world. An agent’s desire for a proposition captures the degree to which he or she prefers its truth, motivating him or her to act accordingly. Although beliefs and desires are sometimes entangled, they play very di¤erent roles in rational agency.1 In two classic papers (Lewis 1988, 1996), David Lewis discusses several challenges to this Humean picture, but ultimately rejects them. We think that his discussion of a central anti-Humean alternative – the desire-as-belief thesis – is in need of re…nement. On this thesis, the desire for proposition p is given by the belief that p is desirable. Lewis claims that ‘[e]xcept in trivial cases, [this thesis] collapses into contradiction’(Lewis 1996, p. 308). The problem, he argues, is that the thesis is inconsistent with the purportedly plausible requirement that one’s desire for a proposition should not change upon learning that the proposition is true; call this the invariance requirement. In this paper, we revisit Lewis’s argument. We show that, if one carefully distinguishes between non-evaluative and evaluative propositions, the desire-asbelief thesis can be rendered consistent with the invariance requirement. Lewis’s conclusion holds only under certain conditions: the desire-as-belief thesis con- ‡icts with the invariance requirement if and only if there are certain correlations between non-evaluative and evaluative propositions. But when there are such correlations, we suggest, the invariance requirement loses its plausibility. Thus Lewis’s argument against the desire-as-belief thesis appears to be valid only in cases in which it is unsound.

I show the incompatibility of two theses: (a) to desire the truth of p amounts to believing a certain proposition about the value of p’s truth; (b) one cannot be said to desire the truth of p if one believes that p is true. Thesis (a), the Desire-As-Belief Thesis, has received much attention since the late 1980s. Thesis (b) is an epistemic variant of Socrates’ remark in the Symposium that one cannot desire what one already has. It turns out that (a) and (b) cannot both be true if it is possible for there to exist an agent who has a desire initially, say the desire for the truth of p, and then expands the corpus of propositions she believes to include p. This result provides a new route to the denial of (a).

In this paper, I explore the question of whether the expected consequences of holding a belief can affect the rationality of doing so. Special attention is given to various ways in which one might attempt to exert some measure of control over what one believes and the normative status of the beliefs that result from the successful execution of such projects. I argue that the lessons which emerge from thinking about the case ofbelief have important implications for the way we should think about the rationality of a number of other propositional attitudes,such as regret, desire, and fear. Finally,I suggest that a lack of clarity with respect to the relevant issues has given rise to a number of rather serious philosophical mistakes.

A report of a person's desire can be true even if its embedded clause underspecifies the content of the desire that makes the report true. It is true that Fiona wants to catch a fish even if she has no desire that is satisfied if she catches a poisoned minnow. Her desire is satisfied only if she catches an edible, meal-sized fish. The content of her desire is more specific than the propositional content of the embedded clause in our true report of her desires. Standard semantic accounts of belief reports require, however, that the embedded clause of a true belief report specify precisely the content of the belief that makes it true. Such accounts of belief reports therefore face what I call "the problem of underspecification" if they are extended to desire reports. Such standard accounts are sometimes refined by requiring that a belief report can be true not only if its subject has a belief with precisely the propositional content specified by its embedded clause, but also only if its subject grasps that content in a particular way. Such refinements do not, however, help to address the problem of underspecification for desire reports.

Rationalizations of deliberation often make reference to two kinds of mental state, which we call belief and desire. It is worth asking whether these kinds are necessarily distinct, or whether it might be possible to construe desire as belief of a certain sort — belief, say, about what would be good. An expected value theory formalizes our notions of belief and desire, treating each as a matter of degree. In this context the thesis that desire is belief might amount to the claim that the degree to which an agent desires any proposition A equals the degree to which the agent believes the proposition that A would be good. We shall write this latter proposition ‘A◦’ (pronounced ‘A halo’). The Desire-as-Belief Thesis states, then, that to each proposition A there corresponds another proposition A◦, where the probability of A◦ equals the expected value of A.

This work examines the nature of what philosophers call de re mental attitudes, paying close attention to the controversies over the nature of these and allied...

The question is how to explain expressions of emotion. It is argued that not all expressions of emotion are open to the same sort of explanation. Those expressions which are actions can be explained, like other sorts of action, by reference to a belief and a desire; however, no genuine expression of emotion is done as a means to some further end. Certain expressions of emotion which are actions can also be given a deeper explanation as being expressive of a wish. Expressions of emotion which are not actions cannot be given a belief-desire explanation: no belief is involved, and a desire is involved only in an honorific sense of 'desire'. The distinction amongst expressions of emotion between those which are actions and those which are not is not a precise one, and the paper concludes with some speculative remarks about borderline cases such as jumping for joy.

Can there be a state which is both a belief and a desire? More exactly, a state which is a belief that p and a desire that q, where p and q may be the same proposition or a different one? Such a state would be a ‘besire’ (following Altham 1986). So a first question is the general question whether besires are possible. Normative attitudes would be good candidates for besires. For example, if Sandra has the normative attitude that it would be best for her to leave the country, this seems to be a propositional state of hers which may be both a belief and a desire. Or, for another example, suppose that Michael has the normative attitude that one should not lie without good reason. Then he seems to hold a belief about lying, namely, that lying without good reason is normatively forbidden, and, at the same time, he also seems to have a desire with respect to lying, namely, the desire not to lie without good reason. A second question is whether normative attitudes are besires.1 There are other good candidates for besires. A ‘simple’ state like the state of the young chicken expressed by its cry may be a case in point. Even though the chicken’s state is probably not a full-blooded propositional state, it seems to be ‘Janus-faced’ as well. Does it descriptively represent the chicken’s hunger? Or is it a desire for food? Maybe both – and then it could be a besire, or something like that.2 Ruth Garrett Millikan mentions another candidate, namely, intentions. Intentions clearly have a desire-like nature. And arguably, they..