What I'm really interested in is how you personally have arrived at your belief. As javra answered earlier "for me, it’s not a fundamental axiomatic belief, but a fundamental known regarding what is. The "how is it so" is tangential to its so being.". That's the sort of thing I'm looking for. Is it axiomatic for you or is it derived from some other belief? How certain are you of it? etc. I may have poked about a bit to get at the meat of your beliefs, but it's those I'm interested in, not the persuasion either way. If that's OK with you.
This distinction @Pfhorrest made of 'phenomenal consciousness' seems very useful to this end. It's exactly that that I want to understand your beliefs about. It's not a distinction which makes any sense to me, not something distinct which requires a name, so I'd like to know how it seems that way to you. As I said, I shan't reply, but I will read with interest at some point. — Isaac
I've always been fine with the distinction between 'phenomenal consciousness' and other concepts of consciousness. The term has a very clear and straightforward meaning for me. The concept of consciousness in this sense is a given for me, at least I have no reason to question it. It has been pointed out many times that this idea of consciousness might just be illusory, i.e. it seems that we have consciousness in this sense, but in fact, we don't. However any 'seeming' at all about anything is sufficient for consciousness, as that is its very definition: that 'something seems to be the case', something appears in consciousness, there is a phenomenon I am aware of. The existence of an illusion of any kind is proof of the reality of phenomenal consciousness. So I am sure about what the word means, and the concept is simple and clear, at least to me.
The philosophy of phenomenal consciousness is in part about the problem of other minds. I know I have experiences, but I can't be sure if other things do, because I am not them. The possibilities are:
1) that nothing else has it (I am in a lonely world of Australian zombies)
or
2) that some things have it and others don't (lets say things with some kind of nervous system have it, but not, say, single-celled organisms. This is some kind of emergentism.)
or
3) that everything has it in some sense (panpsychism).
There are several routes to panpsychism, but the one I think is the most persuasive is probably the argument from non-vagueness. If you are unfamiliar with the topic of vagueness in logic, look up stuff on the Sorites Paradox, the Paradox of the Heap and you should find plenty of stuff. It's easy enough. Anyway, it has struck me, and also a number of other philosophers (Goff and Antony, for example) that phenomenal consciousness is one of the very few concepts that is is NOT vague. It does not admit of degree. There is no 'grey area' between consciousness and non-consciousness. And indeed this is a good way of determining if you share the same concept with someone, as others will often say "Yes, but there are degrees of consciousness, like when you are waking up. You start off asleep, then you have vague fuzzy impressions, and eventually you have clear thoughts and perceptions when you are fully awake." This is a clear indication that people are talking about the
content of consciousness, rather than
phenomenal consciousness itself. The idea of phenomenal consciousness is that no matter how vague and insubstantial your content of consciousness is, you are still conscious, because you are aware of something, whatever it is. And that is all that is needed to fulfil the definition, so you are fully conscious in the phenomenal sense. (NOT in the medical sense like Banno keeps returning to - that sense indeed admits of any number of degrees.) So the idea is that anything is either phenomenally conscious or not, there is no middle ground, there is no partial consciousness, there are no borderline cases, there exist no states, functions, configurations or whatever in which it is indeterminate as to whether a thing is conscious or not.
So, if we accept that this concept is non-vague, what implications does this have for a theory of phenomenal consciousness? If we think some things are conscious and others not (either in the case of my solipsism, or in the case that I think some other things are conscious as well as me) then I need to find a plausible break in nature which I can point to and say "Consciousness is on one side of that break, but not the other." It's got to be an absolutely sharp break, because consciousness cannot emerge gradually as physical systems change. It has to emerge suddenly, if it is to emerge at all. But here is the punchline:
there are no sharp breaks in nature at which consciousness can plausibly emerge. In the development of an embryo, there are a million million tiny changes. The development of any macro characteristics, like a nervous system or a brain or the creation of a protein or whatever, at any relevant scale, is vague. There are borderline cases of each of these structures and any function that depends on them. Arguably, the only sharp break in nature is a jump in energy levels in an atom. Picking ONE single one of those in an evolving organism to place the emergence of consciousness would be absurdly arbitrary, and a million miles from something any emergentist is likely to want to claim. Given the absence of sharp distinctions in nature, if consciousness is somewhere, it has to be everywhere, because consciousness is not a vague concept.