1993, Pacific Philosophical Quarterly
Baldly stated, individualism in psychology is the view that mental states are 'in the head'. But to what does 'mental states' refer? And how are we to understand the 'in the head' metaphor? Given the already vast and growing literature on individualism, it would be naive to expect there to be any one pair of answers to these questions which adequately describes all views which are individualistic, and dogmatic to insist on any such pair as the correct way to understand individualism. In this paper I want initially to fix on a pair of answers to these two questions which provides a characterization of individualism that has received a number of defenses, and then distinguish two types of arguments which have been given for individualism so construed. My central concern will be to identify a problem in one of these types of arguments, a problem which runs sufficiently deep to warrant the rejec tion of this type of argument for individualism. In particular, the appeals that individualists have made to the nature of science (it taxonomizes 'by causal powers'), to the nature of properties (they are causal powers), and to the nature of causation (it operates via causal powers), do not and cannot provide the basis for sound arguments for individualism. II. A Priori and Empirical Arguments fo r Individualism Many proponents of individualism hold that the psychological states and properties that are to play a taxonomic and explanatory role in a properly