To me, consciousness is not generally that you can be aware (conscious) of things around you and can react to them, lots of things can do that.
Consciousness is a shorthand for saying that something is conscious of itself, or conscious of its own consciousness. It is the meta-ability to observe its own perceptions and thoughts. And a sense of self, a sense that the observer is the same over time.
But frankly, it’s a terrible concept and my definition is plenty flawed too. In practice it is more of a moving goalpost to denote the specialness and superiority of humans over all. That thing we can’t quite put a finger on that makes us different. It is a secular euphemism for the soul. It is not very scientific.
And that is quite problematic because the privileges we ascribe to those on the wrong side of the line fall off a cliff. We rely on that line as a foundation for so much of our morals. We have seen the catastrophes that happen when a group has a different idea about the line.
I don’t have a solution to propose, it’s hard.
Consciousness is too overloaded by conflicting definitions.
We could at least imagine the possibility of something coming across as conscious in every way without having a subjective experience of self.
Even a fully deterministic view of consciousness can be compatible with a possible split between entities that act-as-if but without a subjective experience, and those with.
The problem is that there is no reasonable way to prove a subjective experience - we're stuck self reporting. We can't even prove other humans have subjective experience.
It is also not clear that it matters of such entities can act identically.
Which is kind of strange because folks who achieve insight examining their own perceptions and thoughts seem to dissolve the barrier between self and not-self.
"This can be a difficult idea to swallow. Imagine you’re looking out at a countryside scene. You see rolling hills, the vibrant sunshine and a herd of cows. You hear the birds, smell the fresh cut grass and feel the wind on your skin. Surely you are conscious of this whole scene all at once. But we know that working memory has a capacity that is far too tiny to fit all of this information in at one time. If consciousness arises from working memory, then how can I be conscious of all this stuff at once?
Indeed, some philosophers and scientists have argued in just this way, saying that consciousness overflows the capacity of working memory. If this is true, it would be a problem for those who think that consciousness arises from working memory."