It would seem to me in that case, Sageous, that if the entire brain was destroyed, experiencing conscious states would become impossible because their connection to the real world would be permanently out of order. I can't say for sure, but I doubt this is what advocates of the brain as a filer/reciever hypothesis believe, as the whole point of their idea seems (at least to me) to be to present a reasonable non physical basis for consciousness, that isn't completely at odds with neuroscience and, most importantly, allows for experience after death, which doesn't follow if a functional brain is needed for the 'signal' to be experienced.

The filter hypothesis also seems to be inconsistent with the fact that we can induce certain conscious states quite reliably by stimulating certain brain areas. For instance, if we can see that the amygdala is active while someone is in a state of fear, and if we can induce a state of fear by activating the amygdala, then we have more than a mere correlation, but clear cause and effect. I don't see any room for an outside signal here, if you don't think that our activating the relevant brain region to induce fear is actually where the fear is coming from, then I guess you could claim that the outside fear signal is coming in at the exact same time that the activation is taking place, but this is obviously an unparsimonious explanation. All we need to explain the fear is the brain activation, you're adding an extra, unnecessary, dimension.