Springs of Action: Understanding Intentional Behavior by Alfred R. Mele (review)

332 BOOK REVIEWS toral inventions (such as basic Christian communities), and the religious backgrounds of millions who help to make up the churches, Catholic and Protestant, of the United States. Providence College Providence, RI EDWARD L. CLEARY, O.P. Springs of Action: Understanding Intentional Behavior. By ALFRED R. MELE. New York and Oxford: Oxford University Press, 1992. Pp. 272 + ix. $39.95 (cloth). Alfred Mele's overarching aim in this book is to offer an account of the role of intentions in the explanation of intentional action. He works within the familiar terms of causal theories of action, and is particularly indebted to Donald Davidson. In Part I, Mele borrows a set of theses from Davidson's desire/belief model of intentional action, and in the process of addressing problems associated with these theses, he progressively refines an account of action that understands an agent's reasons to have explanatory force by virtue of being among the causes of action. In Part II, Mele argues that desire/belief models are insufficient as they stand and need to be filled out by recognizing that intentions provide a crucial link between reasons and actions. The discussion begins with the vexed question of how the content of mental states can be relevant to the causal explanation of action. We constantly appeal to our desires, beliefs, plans, and so on (i.e., to various propositional, or intentional, attitudes) in explaining our behavior. But how does, say, my appetite for good wine and my belief that the house chardonnay is such a wine figure in the causal order that brings about my act of ordering a glass of it? Presumably, these intentional states supervene upon certain physical states of my body, and the latter do the causal work of producing wine-ordering behavior. However, there are good reasons to think that, with certain sorts of changes in my history and environment (viz., of the sort described in twin earth thought experiments) , these physical states could be the realization of different intentional states. So can a causal theory of action actually accord my desires and beliefs any role in explaining my action? Mele argues that even if we hold (with externalists) that the agent's history and environment help to fix the content of her intentional states, we can nonetheless say that unless the agent had intended what she did, she would not have acted as she did. The behavior is intentional action by virtue of issuing (in the right way) from physical processes BOOK REVIEWS 333 that realize the agent's reasons for acting, and these processes realize these reasons only if the processes have an appropriate causal history. The result is that what we desire, believe, and intend does after all make a systematic difference in what we do. Mele makes some helpful refinements in the standard account of the causal role of desire in intentional action. It has typically been claimed that when an agent's wants compete, the "strongest" of them deter· mines the action; if an agent wants to do A more than anything else that she takes herself to be able to do, then if she acts intentionally she will do A. Mele points out that this general claim must be qualified so as to index desires to times, to accommodate both unsuccessful at· tempts and the agent's estimates of the likelihood of success, and to deal with the complex relations between desires. He explores the way in which agents are able to control the motivational strength of their desires, and he works out a definition of irresistible desire. One of the deepest challenges to the claim that action is caused by what we most desire arises in considering "motivational ties." How, on this account, is intentional action possible when we equally desire each of two incompatible alternatives? An arbitrary decision procedure can be adopted (e.g., a coin toss) , but this alone does not en· hance the attractiveness of the randomly selected alternative. Here Mele introduces his thesis about intentions: viz., that intentions have an "executive quality that is not reducible to desire-strength" (p. 72), so that even when there is no preponderant motivation to do A...