Brain state is in principle detectable. If the fairy changes brain state, the fairy is detectable by physical means and thus physical.
Oh, I see. Yes, the fairy is physical; the brains, however, could in principle be epiphenomenal (although they aren’t, in this example.)
Brain state is in principle detectable. If the fairy changes brain state, the fairy is detectable by physical means and thus physical.
Oh, I see. Yes, the fairy is physical; the brains, however, could in principle be epiphenomenal (although they aren’t, in this example.)