Saying early humans weren’t conscious because they lacked complex language is like saying they couldn’t see blue because they didn’t have a word for it.
Well, Oscar Wilde argues in “The Decay of Lying” that there were no stars before an artist could describe them and draw people’s attention to the night sky.
The basic assumption he attacks is that “there is a world we discover” vs “there is a world we create”.
It is hard paradigm shift, but there is certainly reality in “shared picture of the world” and convincing people of a new point of view has real implications in how the world appears in our minds for us and what we consider “reality”