I discovered Boris Sidis sometime before coming into contact with Jaynes' work, and I must point out how remarkable it is see this former student of William James formulate such a modern view of human psychology. Sidis died in 1923, but fortunately his final book,
Nervous Ills: Their Cause and Cure (1922), was an attempt at popularization. It is quite clear that Sidis formed his ideas within the context of a deep understanding of history (he admired Tolstoy). I think it is possible that Sidis' view could be meshed with Jaynes, filling in some of the explanatory gaps, and even providing a kind of reference point for social sanity.
The Boris Sidis Archive:
http://www.sidis.net/boris_sidis_archives.htmNervous Ills:
http://www.sidis.net/nervousillscontents.htm