Online research in philosophy

Psychological individualism is motivated by two taxonomic principles: (i) that psychological states are individuated by their causal powers, and (ii) that causal powers supervene upon intrinsic physiological state. I distinguish two interpretations of individualism--the 'orthodox' and the 'alternative'--each of which is consistent with these motivating principles. I argue that the alternative interpretation is legitimately individualistic on the grounds that it accurately reflects the actual taxonomic practices of bona fide individualistic sciences. The classification of homeobox genes in developmental genetics provides an illustration. When applied to the taxonomy of psychological kinds, alternative individualism has some surprising consequences. In particular, externalist taxonomies of thought are consistent with the alternative interpretation, and hence consistent with individualism. I conclude, on this basis, that the individualism/externalism dispute which has long preoccupied philosophy of psychology is an empty one.

This paper points to some problems for the position that D.M. Walsh calls "alternative individualism," and argues that in defending this view Walsh has omitted an important part of what separates individualists and externalists in psychology. Walsh's example of Hox gene complexes is discussed in detail to show why some sort of externalism about scientific taxonomy more generally is a more plausible view than any extant version of individualism.

Brian Loar has argued that the well-known arguments against individualism in the philosophy of mind are insufficient because they rely on the assumption that that-clauses uniquely capture psychological content. He tried to show that this is not the use of that-clauses in philosophical psychology. I argue that he does not succeed in his argument. That-clauses sometimes capture psychological content, if our system of mental ascription is to be workable at all. I argue further that individualism tends to be at odds with a requirement of intersubjective shareability of contents and that Loar is alternative conception of psychological content is beset with difficulties.

Millikan and Wilson argue, for different reasons, that the essential reference to the environment in adaptationist explanations of behavior makes (psychological) individualism inconsistent with evolutionary psychology. I show that their arguments are based on misinterpretations of the role of reference to the environment in such explanations. By exploring these misinterpretations, I develop an account of explanation in evolutionary psychology that is fully consistent with individualism. This does not, however, constitute a full-fledged defense of individualism, since evolutionary psychology is only one explanatory paradigm among many in psychology.

This book offers the first sustained critique of individualism in psychology, a view that has been the subject of debate between philosophers such as Jerry Fodor and Tyler Burge for many years. The author approaches individualism as an issue in the philosophy of science and by discussing issues such as computationalism and the mind's modularity he opens the subject up for non-philosophers in psychology and computer science. Professor Wilson carefully examines the most influential arguments for individualism and identifies the main metaphysical assumptions underlying them. Since the topic is so central to the philosophy of mind, a discipline generating enormous research and debate at present, the book has implications for a very broad range of philosophical issues including the naturalisation of intentionality, psychophysical supervenience, the nature of mental causation, and the viability of folk psychology.