Are you familiar with Julian Jaynes? See his book: The Origin of Consciousness in the Breakdown of the Bicameral Mind.

It's funny how the topic of Jill Taylor is up today. Over the weekend I had some time getting caught up on my podcast, and she was one of them.
Great to watch, you can catch the video on itunes podcast(it's free)
under......Oprah.com's Spirit Channel

interesting stuff