Mr_Spinkles said:
So you're saying people can't be semi-conscious? Physical things like drugs and other stimulii can't affect consciousness? What about schitzophrenics and people with multiple personality disorder: is their consciousness "holistic and indivisible"?
So are you suggesting our full-consciousness is built out of smaller semi-consciousnesses? I am talking about reductions of consciousness, not altered states of consciousness.
Of course drugs affect consciousness, just like if I were pushed into a swimming pool, or my hand was caught in the garbage disposal, my consciousness would be affected. Our consciousness is not static and it changes according to the feedback from the physical world. As we have discussed before, if a person is unconscious, or if their consciousness is impaired, then likewise, their freewill is absent or impaired as well.
Mr_Spinkles said:
I think you forget that consciousness is, in fact, within the realm of scientific knowledge and experimentation. Like many things, it is no longer constrained to eclectic philosophical speculation.
Take this project initiated by IBM:
http://www.newscientist.com/article.ns?id=dn7470. They are attempting to create the first full emulation of the human brain on a new custom computer they are building. As a computer engineer I find this project to be very facinating and I am super excited about it. However, I have to chuckle when they state one of their hopes is that it will shed some light on how human consciousness works.
This of course would depend on the computer actually being conscious. The problem is no one has ever proposed a reasonable way of even determining if something like a computer is conscious, much less figuring out whether it is similar to ours. To me, it is kind of like hoping we will figure out a way to build a light bulb out of plastic legos.
Anyway, you may be referring to Daniel Dennett and other behavioralists and functionalists with your reference above to consciousness being within the realm of science. They would just assume the computer is conscious if it seems like it is, and to them that's all we need to know about consciousness. This does not seem to be very scientific to me.
From your perspective, what purpose does consciousness serve? If we do not have freewill, then why did we evolve to have consciousness? Certainly, an organism does not have to be conscious to have a stimulus-response behavior and besides, much of the work the brain does not have any conscious activity.