https://en.wikipedia.org/wiki/Bicameralism_(psychology)

In literature, the 1992 novel Snow Crash by Neal Stephenson involves an attempt to return humans to their bicameral, pre-conscious state. It contains some of the illustrations used in Jaynes’ book. Stephenson’s first novel, The Big U, also contains references to bicameralism as an explanation for cult-like behavior among some of the titular university’s students and teachers.

You’re a fan of Neal Stephenson, you might find the above interesting.

I first got turned on to Bicameralism when I read Julian Jaynes’ book The Origin of Consciousness in the Breakdown of the Bicameral Mind soon after it came out.

Jaynes’ hypothesis was bold, and outrageous, but as much as I refused to accept it I found it difficult to come up with any cogent counter-arguments against it. It was like Rupert Sheldrake’s “Morphological Fields”. Infuriating, but seductive.

I won’t comment on the theory itself, but I’ve given you enough information here for you to follow up on it if you’re interested. The fact Stephenson (and several other literary heavyweights) have incorporated Jaynes’ ideas into their fiction might interest you further. Even if Jaynes’ idea of bicameralism is dead wrong, I still believe his theory is a valuable concept for the study of human consciousness and its origins. The nature of consciousness is, in my opinion, the biggest mystery about the universe we are tasked with solving.

also

https://en.wikipedia.org/wiki/Julian_Jaynes