For anyone trying to generalize Mr. Jayne's theory from an article or set of comments - I suggest that you definitely do not. Really, don't do that with anyone's theories, but instead READ THE BOOK. The way that Jaynes "carves up consciousness" as Daniel Dennet puts it in one review, is very different than the way that a reflexive intellectual instinct would choose to. The taxonomy that Jaynes decides upon is distinc…
Self-awarenes was worked out with "I know that I don't know" and again, but in positive terms with "I think therefore I am". These are the most basic forms of reflection, a y-combinator differentiating endlessly. With literarry writing, this reflection could be stretched out over generations, yielding a national identity, but oral transmission of religious teachings had been practiced before, just with a higher rate of mutation. Such verbalization is important for stability, and similarity is important for discoverability, but if verbalization hadn't happened, the perhaps because it goes without saying.
PS: A single threaded cpu doesn't need to spell out distributed computing primitives, either. It still may use signals, in many cases, even if implemented completely in software.
PPS: maybe there's an interesting parallel from natural language to the progression from imperative language over object oriented or declarative, to agent based programming. Bicameral Petri Nets ...