While there is a vast philosophical literature exploring the conditions under which it is appropriate to hold individuals morally responsible for their actions, relatively little attention has been paid to the related question of which kinds of individuals merit these responsibility ascriptions. Under normal circumstances, typical adult human beings are held morally responsible for their behaviour but infants and nonhuman animals are not. In this thesis, I aim to account for this difference. That is, I aim to give an analysis (...) of the concept of moral agency. In Chapter One, I begin with a schema of moral agency, under which moral agents are characterised by the possession of certain abilities, enabling certain actions, for which certain responses are warranted. The literature on moral responsibility offers many ways of filling in these details, primarily by specifying the relevant agential abilities in terms of various responsibility conditions. My aim in this chapter is to offer a basic account, under which moral agents are characterised by the simplest possible abilities while still being appropriate targets of the relevant responses, such as praise and blame. I draw on the work of Nomy Arpaly, whose account of moral responsibility identifies the relevant ability as the ability to act out of good or ill will. I offer an analysis of this ability, under which basic moral agency is characterised by the ability to have desires about others’ mental states. In Chapter Two, I consider a range of alternative responsibility conditions offered by other philosophers, each of which appears to be necessary for moral agency. I argue that these conditions are not necessary for a basic account of moral agency. In Chapter Three, I move beyond basic moral agency to offer a more restrictive account that aims to capture other important aspects of our moral lives: the practice of justification and our ability to improve our moral character. I claim these aspects are underpinned by the use of moral reasons to guide our behaviour, and in contrast to moral motivation, this guidance is characterised by the ability to have beliefs about the desirability of actions. In Chapter Four, I aim to answer two questions: at what age do humans become moral agents, and are there any nonhuman animals who are moral agents. I draw on the work of Josef Perner, who offers a three-stage framework of the development of mental representation during childhood. I consider the conceptual coherence of this framework, its applicability to both accounts of moral agency developed in the thesis, and the empirical evidence that bears on the framework. As a result, I tentatively conclude that basic moral agency develops at around 18 months of age and may be present in a few species of nonhuman animal, whereas the more restrictive type of moral agency developed in Chapter Three develops no earlier than around 3.5 years of age and is restricted to human beings. (shrink)

To desire is to be in a particular state of mind. It is a state of mind familiar to everyone who has ever wanted to drink water or desired to know what has happened to an old friend, but its familiarity does not make it easy to give a theory of desire. Controversy immediately breaks out when asking whether wanting water and desiring knowledge are, at bottom, the same state of mind as others that seem somewhat similar: wishing never to (...) have been born, preferring mangoes to peaches, craving gin, having world conquest as one's goal, having a purpose in sneaking out to the shed, or being inclined to provoke just for the sake of provocation. These varied states of mind have all been grouped together under the heading of ‘pro attitudes’, but whether the pro attitudes are fundamentally one mental state or many is disputed. (shrink)

This thesis motivates a novel account of desire as the best explanation of an intuitive datum. The intuitive datum is that often when an agent desires P she will immediately, outright know that she has a reason to bring P about. Existing explanations of the intuitive datum cannot simultaneously satisfy two desiderata. We want to explain how desires enable outright knowledge of reasons and also explain the fallibility of desires. Existing views satisfy the first desideratum at the expense of the (...) second, or vice versa. I propose an epistemological disjunctivist account of desire that satisfies both. On this view, a desire for P represents the value of P in a manner analogous to perception. Desires come in two distinct epistemic kinds: an awareness of value or an illusion of value. An awareness of value enables outright knowledge of reasons and allows the agent to tell by reflection that she has such knowledge. An illusion of value merely seems to provide grounds for knowledge, which explains the fallibility of desires. The proposed account is a strong candidate for the truth because it best explains central features of our practical agency. (shrink)