Before revision: And indeed, the fact that Chalmers concludes we have epiphenomenal mental states (also see: Epiphenomenalism) that do not cause our physical behavior seems one reason to reject his principle.
After revision: Indeed, that Chalmers concludes we have epiphenomenal mental states (also see: Epiphenomenalism) that do not cause our physical behavior seems to be a reason to reject his principle.