Most of that seems reasonable and in line with the current western scientific view of the brain. Except for the panpsychism part. It seems the evidence is that the level of conscious correlates with complexity of the arrangement of matter more than the amount of matter. Stars, for example, have an enormous amount of matter but very few would say that have anything like conscious experience.
Probably a lot of contemporary neuroscientists would also disagree that the subjective is in principle, completely inaccessible.
Yes, I have read about Integrated Information Theory (IIT) , it is about Phi , a measure of how information is integrated in a system : that is,
how much does a state of a system constrain its behaviour in the past and future.
I am skeptic of this "theory" , but it is the best thing we have in this field.
By Panpsychism I do not mean that matter is conscious , but that it has a property that allows for consciousness to emerge as we know it.
But that property, has to be an 'inward' property if you will, it is only accessible to the system itself , the atom itself.
The atom surely is blind, but it has a property that can only be viewed from the perspective of "being" an atom. And this property is what evolves to be a conscious experience.
One might argue that consciousness is just like "wetness" .. Yes, both are emergent properties in that wetness emerges from a collection of water molecules, and consciousness emerges from a collection of firing neurons.
But the problem, is that wetness emerges from the shape and fundamental properties of polarity..etc of a single water molecule. Which is an objective property, and wetness is an objective emergent property too.
But consciousness is a subjective phenomenon, therefore, it has (I think) to emerge from a property that is not objective on the microscopic scales.
It is not consciousness like we know it, atoms don't see dark, they are not aware of anything, much like our state when we are in a coma or deep sleep.
But surely there is a side of what it is like to be a man in deep sleep, or an atom..etc. It is not like anything, but there is , if you will, a space (or screen) of possibilities that points inward, that makes it possible for any system to wake up onces some conditions are met.