I don't buy the philosophical zombie argument simply because consciousness does alter behavior. I wouldn't participate in this conversation the same way if I didn't experience consciousness. It would be more like vivid imagination (as apposed to moderate aphantasia) where I find it curious but don't have it. As in the novel, unconscious beings probably behave noticeably different.
There are, apparently, some people who have a very reduced sense of consciousness. I know I have done and said things when I'm not (memorably) conscious, for example when half asleep or coming out of anesthesia, and my behavior has been altered according to witnesses. I wasn't quite "myself". I can also hyper-focus and reduce conscious awareness of my surroundings and of my own body and mind, but that still feels like I have an internal awareness and memory of the experience. I am fairly certain I would be able to tell if that is switched off for a time.
I don’t think you’re conscious. Prove me wrong.
Doesn't that fall back to the old consciousnesses trap that nobody knows how to resolve? How do you know if the human reporting that he's conscious is actually conscious and not philosophical zombie?
We don't know what generates consciousness because we don't know how to measure it, and if we can't measure it, we will always have to take the words of an seemingly conscious entity for it.