Barbara Montero (2003). The Epistemic/Ontic Divide. Philosophy and Phenomenological Research66 (2):404-418.
A number of philosophers think that although we cannot explain how the mind is physical, we can know that it is physical, nonetheless. That is, they accept both the explanatory gap between the mental and the physical and ontological physicalism. I argue that this position is unstable. Among other things, I argue that once one accepts the explanatory gap, the main argument for ontological physicalism, the argument from causation, loses its force.