A naturalistic ontology for mechanistic explanations in the social sciences

There are several approaches in the social sciences that seek to provide causal explanations of social phenomena neither in terms of general causal laws nor in terms of case-specific narratives , but, at a middle level of generality, in terms of recurrent causal patterns or “mechanisms ” (Hedström and Swedberg 1998 ). Typically, these approaches invoke micro-mechanisms to explain macro-social phenomena. Most of them, “analytical sociology ” in particular (Hedström 2005 ), are versions or offshoots of methodological individualism . These individualistic approaches either stick to the “methodological” in “methodological individualism” and leave aside ontological issues, or else they are also individualistic in the metaphysical sense and deny the existence of supra-individual social phenomena that cannot be analyzed in terms of the aggregation of individual actions (see Ruben 1985 ). The ontological challenge to which individualism responds is that presented by holistic approaches that place the social on a supraindividual level of reality. Another possible challenge, coming not from above but from below, that is, from the natural sciences , is generally not considered. The individuals invoked in individualism are not so much the individual organisms recognized in biology as the individual agents recognized in common-sense ontology. Individual agency is taken as a primitive in this approach, rather than as a tentative construct that should be unpacked and possibly questioned by psychology and biology . Most mechanistic approaches, whether their individualism is just methodological or also metaphysical, show little interest in providing the social sciences with a naturalistic ontology , that is, one continuous with that of the natural science. The main goal of this chapter is to outline such a naturalistic ontology. But why should we want such an ontology in the first place? I don’t, by the way, believe that the social sciences in general should systematically work within naturalistic ontology: many