My experience has been, in reading on philosophy of mind, that really the difference between physicalists with regard to consciousness (say Dennett) and non-physicalists (Searle, Chalmers, etc) is that the non-physicalists are entirely persuaded by an intuition that there has to be something that is irreducible. The intuition is stated pretty plainly in that quote:
Quote:
how can it be, that an assemblage of neurons, a group of material objects
firing away has a content?
That's not actually an argument, except from incredulity. Same with the argument about meaning, although it's slightly different. Douglas Hofstadter is a great read as far as thinking about meaning, language, and reductionism. Godel, Escher, Bach is a classic.
Again, I am somewhat in the same boat as Searle et al, in a certain way, but I think it's important to realize that it is the intuition itself, rather than an argument, that is the fundamental reason for the disagreement. The Mary's Room thought experiment I linked before is useful. Dennett will say that Mary does not learn anything new. Plantinga does not agree. There is no argument for why she will learn something new, it is taken as self-evident by non-physicalists that all conceivable possible knowledge about neurons and cones and retinas and photons will not constitute an experience of color