The present seems to be defined by what we are attending* to, the contents of our short term memory. The past seems to be defined by what is stored in our long term memory and is largely fixed.** A.s.a. H. works similarly but there is short term memory on each level of the hierarchy. A sense of a flow of time is associated with the changing contents of short term and long term memories. Long term memory grows.
* hence its pre-eminence
** though forgetting does occur, changing our past. With A.s.a. H. New exemplars get averaged with old cases, modifying the past.
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