I don’t have a comprehensive definition of consciousness, that is exactly my point. Limited, reductionist definitions might serve in strictly limited domains, but no credible source from either science or philosophy claims to explain why it is tgat physical processes in the brain, give rise to the phenomenonal qualities of experience (qualia).
Do you recall the scene in Arnie's first
Terminator movie where we see the world through the Terminator's eyes, and down the LHS of his view runs a printed column of data inputs about his environment? Well, 'qualia' are our equivalent of those, the brain's evolved biochemical and bioelectrical responses to its various sensory inputs, whereby the conscious self is made aware of what's out there and its relevance.
You may divide “the All” into two parts, but there is no sound logical or empirical basis for this assertion; it’s just your prejudice, or your lazy assumption.
I work on three assumptions ─ they have to be assumptions because I can't demonstrate the correctness of any of them without first assuming it's correct. They are, that a world exists external to me, that my senses are capable of informing me about that world, and that reason is a valid tool. Since anyone who posts on RF thereby demonstrates a shared belief regarding the first two, and fingers crossed the third as well, we start from a common basis.
If you disagree, I'll be interested to hear your reasoning.
The idea that the world is composed of discreet entities interacting with each other through direct contact, in the manner described by the old Newtonian physics, is at odds with the last century of theoretical physics.
Y'don't say!
You are in the world and the world is in you, and the division between those separate entities is illusory; all of reality is waves in space, or fluctuations in a quantum field, interwoven with other fields over perhaps multiple dimensions.
So what? I perceive the world via the input of my senses. That's why I say the universe is divided into me and everything else. For me, you are part of nature, and I'm the observer. For you, I'm part of nature and you're the observer. And so on for each observer.
As for the boundaries of consciousness being the boundaries of my body, that’s self evidently false.
You appear to be attributing to me a definition of consciousness that (in this context) I don't share. As far as I'm concerned, the basis meaning of consciousness here is the mental state of being awake and aware. That has nuances, but nothing very subtle.
Im typing this on the bus going home; I’m conscious of the bus, the other passengers, and the people and buildings going past. I’m also conscious, less immediately and vividly so, of the place of work I have just left, and the home I will soon be arriving in. I’m also acutely conscious of a ball of fire 93 million miles away, because summer has finally arrived here.
Therefore?
Whilst those experiments are interesting, they go no way to explaining why the performance of cognitive and behavioural functions are accompanied by experience. In fact I’d say they make the experience of awareness all the more inexplicable.
That's simply a matter for ongoing research. The brain is a biological apparatus of enormous complexity, but we're steadily getting to understand it, to map its regions and their functions and how they intercommunicate and why, and the role of hormones, and so on. We have a long way to go, but if you compare our present knowledge to what we knew before better tools became available in the 1990s, our progress is excellent, though the distance to be traversed yet is still very large.