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AI could already be conscious. Are we ready for it?
(www.bbc.co.uk)
This is a most excellent place for technology news and articles.
This is absolutely the main problem, the only "definition" we have is "I think therefore I am", but that only works subjectively.
We have no way currently to prove consciousness in an AI. And as you say, we don't even have a solid definition commonly agreed upon.
I believe we will achieve consciousness on a human level in AI within a decade.
I also believe consciousness is a gradual thing, and just because animals aren't as smart as we are, doesn't mean they aren't "conscious".
But with AI things are a bit reversed, because AI became smart first, and will only become conscious later.
Have you ever seen 2001 A Space Odyssey? This grift never ends.