Abstract

1. Introduction: Naturalism and Psychological Explanations To a large extent, contemporary philosophical debate takes place within a framework of naturalistic assumptions. From the perspective of the history of philosophy, naturalism is the legacy of positivism without its empiricist epistemology and empiricist conception of meaning and cognitive significance. Systematically, it is best to characterize naturalism as the philosophical articulation of the underlying presuppositions of a reductive scientific research program that was rather successful in the last few centuries and, equally important, promises to be so in the future particularly in the biological sciences and the neurosciences. It seems as if the secrets of human life and behavior and the mysteries of the mind will be cracked on the molecular level of the genes or the brain, or at least so we are told. Viewed in this manner it is understandable why philosophical naturalism tends to be committed to monism, both as a metaphysical or ontological claim and as a methodological position in the philosophy of social science. Naturalists are inclined to adopt a physicalist ontology that rejects free floating Cartesian substances and they view higher order macroscopic facts and properties as being dependent or supervenient on basic micro-physical facts. Naturalists, furthermore, expect that any scientific explanation of higher order properties has to provide an account of why and how these lower order facts give rise to higher order ones. These ontological and epistemic commitments also underpin a position of methodological monism in regard to the social sciences and the explanation of human agency. If the above ontological picture is correct then there is no reason to expect that the structure of the sciences dealing with higher order properties on the social level should fundamentally differ in their methodology from the natural sciences. In both domains of investigation, scientists will develop and make explanatory use of comprehensive and empirically well supported theories with adequate predictive powers that describe....