 It has been argued by several authors that the different modes of presentation at issue in the case of beliefs about phenomenal states do involve the introduction of different reference-fixing properties and that therefore the proposal is unsuccessful. Arguments of that kind are found in Lockwood (1989, chap. 8) and McConnell (1994). White (2007) develops the objection in detail. Block (2007) gives a detailed answer to White (2007) based on a distinction between what he labels cognitive and metaphysical modes of presentation. Chalmers (1996, 2002, 2010) makes a similar point as White (2007) using his framework of primary and secondary intensions. In that framework, primary intensions describe the way a concept picks out its referent in the actual world and the cognitive independence of phenomenal and physical concepts is explained by their different primary intensions. If one singular fact can be known under a physical mode of presentation as well as under a phenomenal mode of presentation, then the two items of knowledge involve two concepts (a phenomenal and a physical concept) with different primary intensions and these different primary intensions correspond to different properties.