Abstract

This dissertation is concerned with whether mental properties can be causally relevant to behavior, that is, whether a mental event can cause a piece of behavior by virtue of its mental properties. Since it seems that my behavior is not just a causal consequence of my beliefs and desires, but is caused by those beliefs and desires precisely because they are those beliefs and desires, an affirmative answer to this question is commonly taken to be required for a successful philosophical defense of commonsense psychology. My discussion proceeds from two widely held, if controversial, views of the nature of mental properties, that they are irreducible to physical properties, and that they are relational/historical properties having components outside the head. I give separate arguments for the causal irrelevance of mental properties from each of these views. I then consider the implications of my views for commonsense psychology. I argue that it is possible to give a plausible account of rationalizing explanation of action without presupposing the causal relevance of the mental. Moreover, I argue that even if scientific psychology has reason to eschew causally irrelevant properties, it is nonetheless possible for scientific psychology to be said to have vindicated our common sense psychological practices. Thus, I defend the claim that causal relevance of the mental is in fact not necessary for a philosophical defense of commonsense psychology