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IIT is the most coherent definition of consciousness I'm aware of https://en.m.wikipedia.org/wiki/Integrated_information_theor...
People dismiss it often, and it has valid academic criticisms, but most "lay" critiques I've seen seem to dismiss it because it gives things they don't consider to be "conscious like them" consciousness.
I think in general, we overexagerate qualities that humans have as uniquely special and important (intelligence, sentience, consciousness), even if the definition of them is fuzzy and any non-fuzzy definition is "too inclusive". I wonder if this is because we are collectively Identity building and creating an "other" out of nature, because otherwise we'd
1. Be much less special as we want to fee
2. Would have to consider a lot of inconvenient externalities for our reasoning (moral and otherwise) to be consistent
And both are slowdowns when you are bootstrapping a post scarcity society out of scarcity, so it'd culturally valuable to reify special qualities that we just determine "we" possess and "they" don't - because it's easier to unify on and allows more actions than making sure everyone can deal with the unfiltered reality of human... unremarkableness in an uncaring world, another social species like so many other with a temporary oligarchy on the planet (without wanting to drone to philosophically, I do think this aspect of Weltschmerz is underappreciated, especially seeing the anxiety amongst my peer group when the topic comes up)