> We don't even know what the pre-requisites for consciousness are so we have no way of knowing.
Imo we don't even have a definition of the word that we agree on.
We're pretty clear on the distinction between a conscious and an unconscious human.
We might not clearly understand the diff between the two states but we can certainly point to it and go "it's that".
Ability to feel pain or pleasure is a good indicator I think..