The problem with definitions is that they frame the view and determine what you see.
Now try a neutral approach. Forget what reality really is and don't view physical other than a description of certain processes. Does physical process influences what humans do? Yes, e.g. a blow to the head can change the behavior.
Do chemical process influence what humans do? Yes, e.g alcohol can change the behavior.
Now I will name these external, they are external to the brain itself and can change the behavior in a brain. Can we describe in observational terms, what happens in a brain for at least some external influences? Yes.
Now here is the trick and it revolves around words.
Do all words have referents external to brains? No, the word "no" is such an example.
Are all words about perceptual experiences? No, the word "no" is such an example.
Are all words cases of involving seeing, tasting, hearing, feeling by touch or smelling? No.
Do you begin to see a pattern? There is a class of words, which have no external referents. They are connected to physical, chemical, biochemical and so on processes in a brain, I will give you that.
But there is the problem. Some words have no external natural referent and can't be reduced to or explained using only external referents. Does that mean that they are supernatural? No, it means that there is a limit to natural explanations based on observations.
In technical terms we are playing different version of metaphysics. I.e. non-reductive versus reductive physicalism. Or in empirical terms are all human experiences reducible to external experiences only? No.!
Now it is tied to the problem of methodology. Is it possible to have only one methodology to do everything as a human? Or the approach of explaining the world as only objective reality as having existence independent of the mind?
I have been doing this for many years now and I know that thinking frames, what you understand. So depending on what you take for granted you get different results.
If you take for granted an external model of only explanations back to objective reality, you frame what you look for in certain way. If you start with humans and explain the world as how humans experience it and use words, you get a different result.
So which one is correct? It depends on what you take for granted.
It is here:
philosophy | Definition, Systems, Fields, Schools, & Biographies
What you define consciousness as, frames, what you understand. If you then shift the approach you understand it differently.
I have learned to do this as - of fundamental dimensions of human existence and experience.
Some humans do it as reality as a whole and then view it thorough a metaphysical lens.
So what is consciousness? That depends on what you in your mind as concepts take for granted, when you start looking.
Science:
Read it and connect the dots to how I explain it.
Are there parts of the world, which don't depend on humans? Yes. Are there parts of the world, which depend on how humans think and feel? Yes. Can these 2 be reduced down to one and not the other? No, so stop doing metaphysics and what not.
Learn that there is no single methodology for doing everything as a human. It always involve objective elements and subjective elements as limited cognitive, cultural, moral and subjective relativism and nobody have been able to reduce the one to the other. I know this, because I have look in the books and what not of the collective human knowledge of different ways of doing a life and I have learned that in some cases what you take for granted, frames what you understand. That is philosophy. Learn to spot as much as what you take for granted and not just everybody else.
Now can you do this differently that me? Yes, because you can use your brain differently than me. Or dare I say, your mind and consciousness.