Does it make sense to speak of "Universal Consciousness" or "Universal Intelligence"?

[Angrboda]

Is there a kind of "critical" mass at which you pull just one more neuron and can suddenly non-arbitrarily announce "now there is no more vision," or "now the person has a complete lack of face recognition" or whatever? Or is it just a gray scale from full functioning down to non-functioning?

We don't know the minimum requirements for each function. What we do know is that damage to specific areas of the brain correlates strongly with specific deficits of functioning. This implies that those aspects of consciousness are associated with those aspects of the brain. Map them all and there isn't a heck of a lot left over to be explained.