I wonder how much this aligns with the parts of the physical brain associated with those different parts of the consciousness (ego, understanding, fear, sensory

I wonder how much this aligns with the parts of the physical brain associated with those different parts of the consciousness (ego, understanding, fear, sensory, autonomous nervous system), and when they start to be deprived of oxygen. From the way you described it, it very much has the feel of going back in time from "civilized person" to "lizard brain".