David Owen’s new book invites us to take a fresh look at three major modern philosophers: Descartes, Locke, and Hume. Although Leibniz invented the familiar conception of proof as a formal relationship among sentences, reasoning for these three philosophers was a very different animal: they thought of it as a matter, not of form, but of content. They regarded proof—demonstration or demonstrative reasoning—as a process of stringing together chains of relations between ideas. That process appeals to the content of the (...) ideas involved, and is thus a radically non-formal conception of reasoning, one that has as little to do with the syllogisms of Aristotle and the Scholastics as it does with the post-Fregean notion of deductive validity dominant today. (shrink)

This article is a critical discussion of David Owen's book, _Hume's Reason. Owen rightly emphasizes (i) that an understanding of Hume's theory of reasoning is essential to understanding his philosophy and (ii) that an understanding of early modern antiformalism in logic is crucial to understanding Hume's theory of reasoning. Against most commentators, Owen and I agree that Hume's famous conclusion about inductive inferences, i.e., that they are "not determin'd by reason"--is a causal rather a normative claim; however, I dispute Owen's (...) particular interpretation of this conclusion, arguing instead for an interpretation that allows Hume to use the term 'reason' univocally to mean "the inferential faculty." While agreeing with Owen that Hume regards the "wise" use of reason as a moral virtue, I argue that Hume's _endorsement of the use of reason is not entirely dependent on this fact. (shrink)

Humean instrumentalism is the view that all of one’s reasons for action are ultimately grounded in one’s antecedent desires, whatever those happen to be. According to this view, what determines which actions are rational is ultimately what the agent wants or desires, while the role of rational deliberation is to inform the agent about how to best gratify these desires. In this paper I aim to weaken commitment to Humean instrumentalism by showing that (a) the main supporting (...) argument for HI fails and that (b) Humean instrumentalism conflicts with a very plausible principle of practical rationality. (shrink)

This paper addresses the two extensional objections to the Humean Theory of Reasons—that it allows for too many reasons, and that it allows for too few. Although I won’t argue so here, manyof the other objections to the Humean Theoryof Reasons turn on assuming that it cannot successfully deal with these two objections.1 What I will argue, is that the force of the too many and the too few objections to the Humean Theorydepend on (...) whether we assume that Humeans are committed to a thesis about the weight of reasons—one I call Proportionalism. In particular, I’ll show how a version of the Humean Theorythat rejects Proportionalism can reasonablyhope to escape both the too many and the too few objections. This will constitute my defense of this version of the Humean Theory. But then, separately, I will argue that this defense of the Humean Theoryis not ad hoc. I’ll argue that Humeans have no reason to accept Proportionalism in the first place. Or at least, no weightyone. There are three parts to the paper. In Part 1 we introduce the Humean Theoryand the too few reasons objection. I’ll first layout the objection, and then layout the basis for a response on behalf of myfavored version of the Humean Theory. There will be an obvious objection to my defense— but it will turn out to depend on the assumption of Proportionalism. This will constitute myargument that the susceptibilityof the Humean Theoryto.. (shrink)

Humeans about practical reasoning have tried to explain how some of our desires are reason‐giving and some are not. On one account, we act from reasons only when we act on desires that cohere in a consistent set. On another account, we act on reasons only when we act on desires that do not undermine our values. Both accounts are problematic. First, the notion of a consistent set of desires is vague and introduces a criterion not necessarily rooted (...) in the agent's own motivations. Second, valuing is a matter of degree: we cannot divide desires into those that reflect values and those that don't. I maintain instead that all desires are reason‐giving, but we have best reason to do what we most care about, and the rationality of desires derives from the normative perspective we take on our desires in attempting to determine their relative importance to us. (shrink)

Humeans about normative reasons claim that there is a reason for you to perform a given action if and only if this would promote the satisfaction of one of your desires. Their view has traditionally been thought to have the revisionary implication that an agent can sometimes lack any reason to do what morality or prudence requires. Recently, however, Mark Schroeder has denied this. If he is right, then the Humean theory accords better with common sense than it (...) has been thought to. I argue that Schroeder is mistaken, even if welfare is understood in terms of the satisfaction of one’s desires: any Humean must concede that one can sometimes lack any reason to act morally or prudently. I also identify a novel variant on Humeanism that could perhaps avoid its revisionary implications about prudence if desire satisfactionism is the correct theory of welfare. (shrink)

This article presents a limited defense of Humeanism about practical reason. Jonathan Dancy and other traditional objective-reasons theorists argue that all practical reasons, what we think about when we deliberate, are facts or states of affairs in the world. On the Humean view, the reasons that motivate us are belief-desire combinations, which are in the mind. Thus, Dancy and others reject Humeanism on the grounds that it cannot allow that anyone acts from a normative reason. I (...) argue, first, that this critique fails. What we deliberate about prior to action in cases of conflict sometimes are our desires: we consider our wants from a “normative” perspective. So normative reasons are also desire-based, but involve appeal to desires of a higher order. These second-order desires can motivate. Second, I argue that objective-reasons theorists have a reverse problem with explanation of behavior. If reasons are considerations in the world, a person has reasons to do any number of actions at any given time. I charge that theories that exclude desire-based reasons cannot explain why an agent does one particular action rather than another. Recent philosophers strike a compromise position, allowing for normative reasons in terms of facts and motivating reasons in other terms. However, I suggest that they may be subject to the same difficulty because of the relation between normative and motivating reasons that each has. (shrink)

Hume and contemporary “Humeans” have had prominent roles in reinvigorating the study of practical reason as a topic in its own right. I introduce a distinction between two divergent trends in the literature on Hume and practical reason. One trend, action-theoretic Humeanism, primarily concerns itself with defending a general account of reasons for acting, often one supposed to establish that moral reasons lack the categorical status the moral rationalist requires them to possess. The other trend, virtue-theoretic Humeanism, concentrates (...) on defending the case for being an agent of a particular practical character, one whose enduring dispositions of practical thought are virtuous. I discuss work exemplifying these two trends and warn against decoupling thought about Hume’s and a Humean theory of practical reason from Hume’s and a Humean ethics. I conclude that the virtue-theoretic approach is a fruitful one for pursuing future work on Hume and Humeanism about practical reason. (shrink)

In his recent book Slaves of the Passions , Mark Schroeder defends a Humean account of practical reasons ( hypotheticalism ). He argues that it is compatible with 'genuinely agent-neutral reasons'. These are reasons that any agent whatsoever has. According to Schroeder, they may well include moral reasons. Furthermore, he proposes a novel account of a reason's weight, which is supposed to vindicate the claim that agent-neutral reasons ( if they exist), would be weighty (...) irrespective of anyone's desires. If the argument is successful, it could help avoid an error-theory of moral language. I argue that it isn't, and that we should reject a Humean approach to reasons. (shrink)

While Kant does not address the problem of induction often attributed to Hume, he does, by way of a transcendental deduction of an a priori principle of reflecting empirical judgment, address a distinct problem Hume raises indirectly. This problem is that induction cannot be justified so long as it presupposes some empirical concept applying to or some empirical principle true of more than one object in nature, a presupposition neither determined by nor founded on reason. I draw on Hume’s positive (...) account of induction to motivate the following objection to Kant: in so far as induction can be justified, there is reason to doubt that it would be so in virtue of any a priori feature. (shrink)

A variety of strategies have been used to oppose the influential Humean thesis that all of an agent’s reasons for action are provided by the agent’s current wants. Among these strategies is the attempt to show that it is a conceptual truth that reasons for action are non-relative. I introduce the notion of a basic reason- giving consideration and show that the non-relativity thesis can be understood as a corollary of the more fundamental thesis that basic reason-giving (...) considerations are generalizable. I then consider the relationship between the generalizability thesis and the Humean thesis that all of an agent’s reasons for action are provided by the agent’s current wants. I argue that, contrary to a common assumption, there is a subtle and clearly motivated version of the Humean thesis that does not deny, and so is not threatened by, the generalizability thesis. (shrink)

This book defends the Humean Theory of Motivation, according to which desire drives all action and practical reasoning. -/- Desire motivates us to pursue its object. It makes thoughts of its object pleasant. It focuses attention on its object. Its effects are amplified by vivid representations of its object. These aspects of desire explain why motivation usually accompanies moral belief, how intentions shape our plans, how we exercise willpower, what human selves are, how action can express emotion, why we (...) procrastinate, and how we daydream. The Humean Theory also suggests a new account of moral judgment that upholds objectivity while understanding moral concepts in terms of our feelings. (shrink)

One of the main reasons for philosophers to have embraced Humean constructivism rather than Kantian constructivism is a negative one: they believe that in the end Kantian constructivism is an unsta...

Several prominent philosophers have argued that the fact that depressed agents sometimes make moral judgments without being appropriately motivated supports Humean externalism – the view that moral motivation must be explained in terms of desires that are distinct from or “external” to an agent’s motivationally inert moral judgments. This essay argues that such motivational failures do not, in fact, provide evidence for this view. I argue that, if the externalist argument from depression is to undermine a philo-sophically important version (...) of internalism, it must make use of a general assumption about motivational states. However, at a reasonable level of abstraction, the needed assumption also implies that even desires could not be effective sources of motivation. For, just as depressed agents might sometimes lack motivation to act consistently with their moral judgments, they also sometimes lack motivation to pursue their desires. Moreover, the most plausible responses that Humeans can give to this general argument undermine the externalist case against internalism. Thus, there is a deep tension between the argument from depression for externalism and a fundamental Humean commitment. (shrink)

On a Humean account, a person's reasons for action are determined by her desires---in the broadest sense of 'desires', that is, noncognitive pro-attitudes. In four essays, I defend this account against several prominent objections. The first essay addresses the concern that the Humean cannot account for rationalizing reasons . The next three essays concern justifying reasons : reasons for action that are more fully normative than those that merely make action intelligible. Instrumental reasons, (...) prudential reasons, and intrinsic reasons are three different sorts of reasons to which an agent can appeal in justifying her action. ;Each essay focuses on a specific attack against the Humean account. In the second essay I argue that the normatively of instrumental reasons is brute ; and that, contrary to the received view, this is compatible with Humeanism. In the third essay I consider prudential reasons and defend the Humean claim that all and only present concerns provide normative reasons for action. In the final essay I address the fundamental question considerations of deliberative relevance: what makes certain desires and considerations relevant to a specific decision-making context, that is, what puts them among a person's present active reasons. ;In addition to defending a broadly Humean account of practical reasons, I am concerned to expand the components of a plausible form of Humeanism. Specifically, I argue that desires alone are not always sufficient to ground an agent's reasons, and that affective states are sometimes also necessary. I call this view "thick Humeanism". In essays one and four especially, I urge that a central place be given to affective states in determining practical reasons. I also invoke recent studies in cognitive psychology to support my claims about the role of the emotions in practical deliberation. (shrink)

I introduce a distinction between two divergent trends in the literature on Hume and practical reason. One trend, action-theoretic Humeanism, primarily concerns itself with defending a general account of reasons for acting. The other trend, virtue-theoretic Humeanism, concentrates on defending the case for being an agent of a particular practical character, one whose enduring dispositions of practical thought are virtuous. I discuss work exemplifying these two trends and warn against decoupling thought about Hume's and a Humean theory of (...) practical reason from Hume's and a Humean ethics. I conclude that the virtue-theoretic approach is a fruitful one for pursuing future work on Hume and Humeanism about practical reason. (shrink)

In his important recent book Schroeder proposes a Humean theory of reasons that he calls hypotheticalism. His rigourous account of the weight of reasons is crucial to his theory, both as an element of the theory and constituting his defence to powerful standard objections to Humean theories of reasons. In this paper I examine that rigourous account and show it to face problems of vacuity and consonance. There are technical resources that may be brought to (...) bear on the problem of vacuity but implementation is not simple and philosophical motivation a further difficulty. Even supposing vacuity is fixed, the problems of consonance bring to light a different obstruction lying in Schroeder’s path. There is a difference between the general weighing of reasons and the context specificity of the correct placing of weight on them in deliberation and this difference cannot be fixed by the resources in the account. For these reasons we are still waiting for a plausible Humean theory of reasons. (shrink)

In this paper I reply to Stefaan Cuypers' explication and critique of my views on rationality and critical thinking (Cuypers, 2004). While Cuypers' discussion is praiseworthy in several respects, I argue that it (1) mistakenly attributes to me a Humean view of (practical) reason, and (2) unsuccessfully argues that my position lacks the resources required to defend the basic claim that critical thinking is a fundamental educational ideal. Cuypers' analysis raises deep issues about the motivational character of reasons; (...) I briefly address this matter as well. (shrink)

In this paper I will argue that the latter group [of Non-Humeans] is correct. My argument focuses on practical deliberation and has two parts. I will discuss two different problems that arise for the Humean Theory and suggest that while taken individually each problem appears to have a solution, for each problem the solution Humeans offer precludes solving the other problem. I will suggest that to see these difficulties we must take seriously the thought that we can only understand (...) an agent’s reasons for her action by looking at her actual or possible practical deliberation. (shrink)

Humeans hold that the nomological features of our world, including causal facts, are determined by the global distribution of fundamental properties. Since persistence presupposes causation, it follows that facts about personal identity are also globally determined. I argue that this is unacceptable for a number of reasons, and that the doctrine of Humean supervenience should therefore be rejected.

I present an exemplary Humean modal epistemology. My version takes inspiration from but incurs no commitment to both Hume’s historical position and Lewis’s Humeanism. Modal epistemology should meet two challenges: the Integration challenge of integrating metaphysics and epistemology and the Reliability challenge of giving an account of how our epistemic capacities can be reliable in detecting modal truth. According to Lewis, modal reasoning starts from certain Humean principles: there is only the vast mosaic of spatiotemporally distributed local matters (...) of fact. The facts can be arbitarily recombined. These principles cannot be taken for granted. I suggest a bottom-up approach instead: Humean principles of recombining the mosaic of facts can be retrieved from the evolutionarily instilled and empirically informed use of imagination in exploring everyday circumstantial possibilities. This use of imagination conforms to a primitive conception of matter as freely recombinable. The modal beliefs that can be obtained from generalizing the more elementary exercise of imagination have to be corrected. Recombination is limited by sortal criteria of identity. Moreover, the overall picture of a recombinable spatiotemporal mosaic must be weighed against the results of science. (shrink)

The theory that practical reasoning is wholly instrumental says that the only practical function of reason is to tell agents the means to their ends, while their ends are fixed by something other than reason itself. In this essay I argue that Hume has an instrumentalist theory of practical reasoning. This thesis may sound as unexciting as the contention that Kant is a rationalist about morality. For who would have thought otherwise? After all, isn't the ‘instrumentalist’ line in contemporary discussions (...) of this topic descended directly from Hume himself? Contrast the following recent comment from Robert Audi's book on practical reasoning, holding the standard line, with the comment from Christine Korsgaard following it:Hume's conception of practical reasoning, so far as we can formulate it, can be located within … the foundationalist account of motivation in which reason plays the instrumentalist role … by virtue of arousing and directing our desires. (shrink)

This chapter argues that Humean analyses do not provide content‐preserving reductions and non‐trivial accounts of the reference. It introduces a distinction between structure in the realm of Being and structure in the representations of Being. The chapter argues that there are good reasons not to expect content‐preserving reductions of the modal to the non‐modal at the level of content, or useful mappings of content‐level structures into structures at the level of Being. In the rest of the chapter, the (...) author deals with the relationship between content‐level structure and structure at the level of Being. The debate between the Humean and non‐Humean should be reconceived as a debate about whether non‐Humean facts play a substantive role in the story of how beliefs about laws and chances are formed and used. (shrink)

This essay examines arguments offered in support of the Principle of Sufficient Reason (PSR) by Leibniz and his followers as well as Hume's critique of the PSR. It is shown that Leibniz has a defensible argument for the PSR, whereas the arguments of his self-proclaimed followers are weak. Thus, Hume's challenge is met by Leibniz, by Wolff and Baumgarten not so much.

If Hume is correct that the descriptive and the normative are “entirely different” matters, then it would seem to follow that endorsing a given account of action-explanation does not restrict the account of practical normativity one may simultaneously endorse. In this essay, I challenge the antecedent of this conditional by targeting its consequent. Specifically, I argue that if one endorses a Humean account of action-explanation, which many find attractive, one is thereby committed to a Humean account of practical (...) normativity, which many find unattractive. The key to this argument is showing that the justificatory base of any anti-Humean normative view is a generic representation of ideal rationality, which precludes any such view from combining coherently with a Humean account of action-explanation. If my arguments are successful, they demonstrate a way in which one’s views in action theory can both limit and be limited by the ethical views one endorses. (shrink)

Humean Nature: How Desire Explains Action, Thought, and Feeling, by Neil Sinhababu. Oxford: Oxford University Press, 2017. Pp. ix + 224.

The paper uses the concept of typicality to spell out an argument against Humean supervenience and the best system account of laws. It proves that, in a very general and robust sense, almost all possible Humean worlds have no Humean laws. They are worlds of irreducible complexity that do not allow for any systematization. After explaining typicality reasoning in general, the implications of this result for the metaphysics of laws are discussed in detail.

This chapter investigates the prospects for an important position that falls under the "mere patterns" approach: what, for reasons that will emerge, the author calls"Humean reductionism" about laws of nature, a view championed perhaps most prominently by David Lewis. He reviews some of the most interesting arguments against this position from the literature, and adds some of his own that, he thinks, are more effective. The chapter considers how the best system account (BSA) would apply to the Newtonian (...) particle world. The BSA has been challenged in a wide variety of ways: it violates certain intuitions; It makes a hash out of the connection between laws on the one hand, and counterfactuals, explanation, and induction on the other. The author thinks that the problem he has raised‐challenging though he hopes it is, is really an occasion for the Humean reductionist to sharpen his position still further. (shrink)

Classic inductive skepticism–the epistemological claim that we have no good reason to believe that the unobserved resembles the observed–is plausibly everyone’s lot, whether or not they embrace Hume’s metaphysical claim that distinct existents are “entirely loose and separate”. But contemporary advocates of a Humean metaphysic accept a metaphysical claim stronger than Hume’s own. I argue that their view plausibly gives rise to a radical inductive skepticism–according to which we are downright irrational in believing as we do about the unobserved–that (...) we don’t otherwise have reason to accept. The Metaphysical Neo-Humean is in an epistemological quagmire all her own. (shrink)

This is an age of naturalization projects. Much epistemological work has been done toward naturalizing theoretical reason. One might view Hume as seeking to naturalize reason in both the theoretical (roughly, epistemological) and the practical realms. I suggest that whatever else underlies the vitality of Hume's instrumentalism - encapsulated in his view that 'reason is and ought only to be the slave of the passions' - one incentive is the hope of naturalizing practical reason. This paper explores some broadly (...) class='Hi'>Humean versions of instrumentalism that are among the most plausible contenders to represent instrumentalism as a contemporary naturalistic position. It first offers a taxonomy of reasons for action and, in that light, formulates a plausible version of instrumentalism. It then raises difficulties for the view, some of them concerning the nature of desire. It also develops an epistemologically significant comparison of desires with beliefs. Given the magnitude of the difficulties, it outlines an alternative account of practical reason. (shrink)

Michael B. Gill offers a new account of Humean moral pluralism: the view that there are different moral reasons for action, which are based on human sentiments. He explores its historical origins, and argues that it offers the most compelling view of our moral experience. Together, pluralism and Humeanism make a philosophically powerful couple.

Humeans have a problem with quantities. A core principle of any Humean account of modality is that fundamental entities can freely recombine. But determinate quantities, if fundamental, seem to violate this core principle: determinate quantities belonging to the same determinable necessarily exclude one another. Call this the problem of exclusion. Prominent Humeans have responded in various ways. Wittgenstein, when he resurfaced to philosophy, gave the problem of exclusion as a reason to abandon the logical atomism of the Tractatus with (...) its free recombination of elementary propositions. Armstrong promoted a mereological solution to the problem of exclusion; but his account fails in manifold ways to provide a general solution to the problem. Lewis studiously avoided committing to any one solution, trusting simply that, since Humeanism was true, there had to be some solution. Abandonment; failure; avoidance: we Humeans need to do better. -/- In this paper, I present what I take to be the best account of quantities, tailoring it where needed to meet Humean demands as well as my own prior commitment to quidditism, and my own comparativist inclinations. In short: determinables, not determinates, are the fundamental properties, and freely recombine; determinates arise from the instantiation of determinables in an enhanced world structure; determinate quantities may be local (in a sense to be explained), but they are not intrinsic. Is the account I end up with Humean? Not, unfortunately, as it stands: the problem of exclusion still rears its ugly head. After dismissing a failed attempt at a solution, I consider in the final section the two viable Humean options. One attributes the source of the necessary exclusions to conventional definition, the other attributes it to logic. The first is safe and familiar, but not a response I can accept given my other commitments. The second is more radical and less familiar; but I am convinced it is on the right track. I don’t have space to develop it much here, but I put it out for future research. (shrink)

David Hume famously criticized rationalist theories of practical reason, arguing that reason alone is incapable of yielding action, and that some passionate element must be supplied. Contemporary theories of Humean inspiration develop a causal-explanatory model of action in terms of the joint operation of two distinct mental states: beliefs and desires, one inert and representational, the other dynamic. Such neo-Humean theories claim that since desires, unlike beliefs, are not subject to direct rational evaluation, an act can be said (...) to be rational only in the sense that it is instrumental to realizing the agent’s desires. The historical Hume appears to have embraced a “sceptical solution” involving a more dynamic conception of belief, while admitting a default sense in which both beliefs and actions can be deemed reasonable or unreasonable. (shrink)

In this paper, we focus on two related reductive theses in metaphysics—Humean Supervenience and Composition as Identity—and on their status in light of the indications coming from science, in particular quantum mechanics. While defenders of these reductive theses claim that they can be updated so as to resist the quantum evidence, we provide arguments against this contention. We claim that physics gives us reason for thinking that both Humean Supervenience and Composition as Identity are at least contingently false, (...) as the very process of composition determines, at least in some cases, the nature of composed systems. The argument has essentially to do with the fact that denying the reductive theses in question allows one to provide better explanations for the quantum evidence. (shrink)

Michael Smith's recent defence of the theory shows promise, in that it captures the most common reasons for accepting a Humean view. But, as I will argue, it falls short of vindicating the view. Smith's argument fails, because it ignores the role of rationality conditions on the ascription of motivating reason explanations. Because of these conditions, we must have a theory of rationality before we choose a theory of motivation. Thus, we cannot use Humean restrictions on motivation (...) to argue for a particular conception of rationality. I will not directly criticize using a Humean conception of rationality to defend a Humean theory of motivation. For my argument implies that such criticism must come more directly, as argument over the substantive content of rationality. (shrink)

This essay defends a strong version of the Humean theory of motivation on which desire is necessary both for motivation and for reasoning that changes our desires. Those who hold that moral judgments are beliefs with intrinsic motivational force need to oppose this view, and many of them have proposed counterexamples to it. Using a novel account of desire, this essay handles the proposed counterexamples in a way that shows the superiority of the Humean theory. The essay addresses (...) the classic objection that the Humean theory cannot explain the feeling of obligation, Stephen Darwall's example of motivationally potent reasoning that is not based on preexisting desires, Thomas Scanlon's criticism that the Humean theory fails to account for the structure and phenomenology of deliberation, and the phenomenon of akrasia as discussed by John Searle. In each case a Humean account explains the data at least as thoroughly as opposing views can, while fitting within a simpler total account of how we deliberate and act. (shrink)

David Lewis has proposed an analysis of lawhood in terms of membership of a system of regularities optimizing simplicity and strength in information content. This article studies his proposal against the broader background of the project of Humean supervenience. In particular, I claim that, in Lewis's account of lawhood, his intuition about small deviations from a given law in nearby worlds (in order to avoid backtracking and epiphenomena) leads to the conclusion that laws do not support (certain) counterfactuals and (...) do not bestow nomic necessity on (certain) facts induced by these laws. Support of counterfactuals and nomic necessity, however, are widely held to be important aspects of the concept of lawhood. In my view, therefore, it is not possible to abandon these criteria in any satisfactory analysis of the notion of laws of nature. In a final section, I suggest that the whole project of Humean supervenience is misleading. It does not sufficiently take notice of the important role that reasoning about contrary-to-fact situations plays in modern scientific practice. (shrink)

Moral motivation refers to the psychological causes that motivate or explain moral action. Moral action refers to action that complies with the requirements of morality. In this essay, I lay out alternative views on moral motivation, giving particular attention the way each view conceives of the explanatory link between practical reasoning and moral conduct. In trying to understand this link, philosophers look to moral judgment. The main rival accounts of the relationship between practical reasoning, moral judgment, and moral motivation can (...) be distinguished according to the way in which they respond to two questions: (1) Can a cognitive (i.e., belief-like) state produce in an agent a motivation at time t, without being accompanied by an affective (i.e., emotional or desire-like) state which exists prior to t? (2) Are moral judgments cognitive states or affective states? -/- I shall defend the Humean theory of motivation, or HTM, as the best account of moral motivation. HTM is often called the belief-desire model of action because it explains behavior by citing a combination of a desire for some end and a belief that a certain action is a means to satisfying that desire. The Humean answer to the first question above is that any process of practical reasoning which generates a motivation is necessarily linked to a non-cognitive state. Regarding the second question, Humeans are split between cognitivists and non-cognitivists. Anti-Humeans, on the other hand, hold that moral judgments express cognitive states, and that cognitive states can independently produce motivations via practical reasoning. -/- I offer two arguments in favor of HTM. First, I suggest that Humeanism meets one criterion of theory choice better than anti-Humeanism. This is the continuity constraint. Given that humans and non-humans evolved common ancestors, the continuity constraint advises us to prefer an account of human psychology which can explain how complex human traits evolved from simpler antecedents resembling the traits of non-human animals. Non-human primates, in particular, are capable of acting altruistically toward con-specifics. Altruistic behavior in primates can shed light on an evolutionary precursor to moral action in humans, since morally significant action often involves altruism. I maintain that a Humean theory of motivation offers the best explanation of altruistic behavior in non-human primates. Therefore, by the continuity constraint, HTM should be the preferred model of the psychological mechanisms underlying human moral motivation, unless empirical evidence strongly suggests otherwise. -/- To ward off the objection that anti-Humeanism is warranted due to the vast differences between humans and non-human primates, I offer a second argument for HTM. This is an argument from a criterion of theory choice called Morgan’s Canon. Morgan’s Canon is a standard of theoretical parsimony according to which a psychological mechanism should be attributed to an organism only if it’s the sole mechanism which can cause some behavior. I argue that HTM meets this criterion much better than anti-Humeanism. This is because the special psychological mechanisms which anti-Humeans postulate to explain moral action are not the sole mechanisms which could produce such action. Rather, the Humean belief-desire model could easily be recruited to explain moral action, as well as a broad variety of non-moral actions. (shrink)