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The Preconscious is often encoded in a very flamboyant way, Like Tyler Durden in Fight Club or the Joker in the Dark Knight. I'm wondering, can The Preconscious also mean something subtler like the absent-mindedness of an author submerged in his work? Or having ADHD.

Absolutely. It can be big or small, such as a stammer or tic or being jumpy at loud noises. But make sure absent-mindedness is not seen as a matter of memory

In the Godfather, Preconscious shows up as a Story Precondition with Fredo fumbling with the with the gun, Sonny being impulsive, and Michael being calm under the threat of attack, which is what is required to be accepted and effective as the new don.