You dont need an inner dialogue to think plenty of people today dont have an inner dialogue and they can think just like everyone else.
Also plenty of animals and all mammals can think so I dont know why the first humans shouldnt be able to think. There are other animals that also have a sense of self so it doesnt seem like you need language for that either.
I’m not even sure it makes sense to talk about the first human. It’s like talking about your first day as an adult. You can’t point to any day and say it was your first day as an adult. Likewise you can’t point to any organism and say it was the first human. Just like everything else the degree of consciousness existed on a spectrum as our ancestors evolved.
Language is much more than just speaking and writing. Anything that can be used to communicate is a language – so grunts, facial expressions, body posture, etc, are all aspects of language.
I don’t have this exactly, but I like the definition that consciousness or the sense of self is being able to 1) create a fictional world, 2) place oneself in it, and 3) observe from a 3rd party perspective.
One of the really interesting theories in this regard is the Bicameral Mind. I know this is a controversial theory, but it makes for a very good mental exercise in thinking about consciousness.
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