OK, fair enough. The second response applies.

Said differently, I expect that the set of cognitive activities required to support linguistic behavior that we can't distinguish from, say, my own (supposing here that I'm a conscious being) in a sufficiently broad range of linguistic interactions correlates highly enough with any other measure of "this is a conscious being" I might care to use that any decision procedure that files a system capable of such activities/behavior as "nonconscious" will also file conscious beings that way.