Abstract

In discussions on mental causation and externalism, it is often assumed that extrinsic, or relational, properties cannot have causal efficacy. In this paper I argue that this assumption is based on a category mistake, in that causal efficacy (dependence among events or states of affairs) is confused with causal influence (persistence of and interaction among objects). I then argue that relational properties are indeed causally efficacious, which I explain with the help of Dretske's notion of a 'structuring cause'