Excepting I ask what caused the word "consciousness" to be current in the English language? We can know of consciousness, and speak of it? What caused this knowledge? (cf causal theory of knowledge for my angle on this).
You raise a good point, and I should clarify: consciousness doesn't seem to have any causal power that alters an organism's function. Any zombie could perform the same functions that a human can. As you've pointed out, it is true that the zombie and the human would not have the same set of beliefs, namely the zombie would not know that it was conscious (because it is not). However, I do not believe that such additional knowledge would alter the human's functional capabilities, and as such, consciousness would be causally impotent with regard to adaptive advantages.
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