Does anyone have interest in continuing with a definition of awareness?
What are the bits that seem to comprise this composite word? I think there is quite a bit to be said about both perception and understanding since those two are hanging out there. Probably not much to say about intentionality. Attention is an interesting process that seems to include a direction of fit and some level of energy expenditure in that direction of fit. Not sure what else there is to attention, but maybe others wish to chime in?
Or not?
Perception is much broader than consciousness. Clearly we perceive (and even understand, remember, and learn from) a lot of input we're never conscious of.
Understanding is problematic. I understand how to swim and ride a bike, but I can do them both without thinking about it. I also understand that 2+2=4, but it's not something I'm thinking about all the time.
Intentionality. I'm not sure exactly what you mean here. Can you fill that in a little bit?
Attention, though, is interesting. But I don't think there's a 100% correspondence to consciousness. Subliminal studies, for instance, demonstrate clearly that we're attending to (and processing) a whole lot more input than we're consciously aware of.
At the end of the day, consciousness is consciousness, and I don't know that it makes much sense to attempt to equate it with other functions of the brain.
It does seem an odd thing for the brain to do, especially since it uses up a good deal of resources. And why are we aware of our dreams? That's a real puzzler.
So far, the best tentative explanation I've run across is that consciousness is the most efficient way to make very high-level decisions involving simultaneous resources from across the brain. But that could turn out to be completely wrong.
What seems clear from the current research, though, is that consciousness is a downstream function, involving information that's already highly processed.
In other words, we don't decide to pay attention to anything. Instead, our brains "push" highly processed and chunked information into conscious awareness. Things move into and out of our conscious awareness because non-conscious functions of our brains determine that they should.
But here's the really bizarre bit....
In order for consciousness to be worth the trouble, in order for it to have any useful purpose at all, there must be something coming out the other end. It must somehow feed back into the system. Otherwise, it would be a total loss, and it's impossible to imagine how it could have evolved.
So this is the last hope of free will. And as odd as free will seems from a material perspective (which is my perspective) there does seem to be a good chance that there's something to it.
Because if conscious awareness didn't serve a function, didn't do something which non-conscious processing couldn't do, we wouldn't have it.
So this function of consciousness, which supports our sense of self and our feelings of autonomy, must be adding something that cannot be had (or, at least, is not had) any other way. It's doing something.
In the end, I don't think we'll end up understanding consciousness by analogy to other functions of the brain, but rather by understanding how it is physically done, and why it is done, and what it adds to the system.