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I do like the idea of the triune brain but I'm not sure if I buy it. Where is this third part, this preconscious? Where does it exist? In our memory or lack thereof? I suppose what I like about the bipartite brain is that I feel like I can see it. There is an action/reaction structure that I find satisfying. I won't discount the importance of this social function or the need for talk therapy, I have seen first hand how useful it can be. I just don't understand WHERE this bridge between  the conscious and tacit knowledge exists. As we do more and more research we begin to understand how much behaviour is tacit and how much of say, Freud's story for example, is obselete. It is unnecessarily complicated perhaps when it doesn't need to be.

As for tacit knowledge, I am a big fan of this being the 'unconscious' we so often discuss. Lets take something like flirting for example. All of us know how to do it (to varying degrees of success) but certainly no one has taught us how. This is just one of many examples. We talk about a shared consciousness but I think, the story that is more useful perhaps, is the idea of a shared tacit knowledge (or unconscious if you like that word). We are linked more closely by what we do without realising than anything else.