it still strikes me as extraordinary that any such major thing as a "subconscious mind" would arise fully formed in any evolutionary path. it would take extraordinary evidence to support such a theory, and one of the building blocks would be showing that neighboring species don't carry that trait. I guess that would be enough to disprove it, because once we start looking for that (I mean you and I, not science in general, that must have been looking into that for a long time), we'll surely find plenty of evidence of incremental evolution of this trait, just like of pretty much every other trait we observe in humans.