IMHO we (as humans) cannot understand objectively what it is like to be humans. We are all 'inside the box' as humans together. it's simply impossible for us to make any reasonable hypothesis of what is happening or how subjective conciousness works. The moment we loose our subjective conciousness we loose the ability to try and analyze it. The moment we gain it, we are bound by it's limitations and unable to see out of it. A physical analog to this would be an insect born and raised in a cave trying to describe sunlight - it simply has no ability to formulate a way to describe it, because it's to far away from it's experience.