The amazing memories demonstrated by some savants (e.g. Kim Peek) present an interesting challenge to "reconstruction" views of memory. Kim seems to have a photographic memory for whatever text his eyes fall upon. One explanation:

"... these savants have come to rely on more primitive cortico-striatal (procedural or habit) memory rather than higher level cortico-limbic (semantic or declarative) memory. This combination of right brain skills coupled with procedural
memory produces the constellation of abilities and traits that is savant syndrome."

D. A. Treffert, M.D.  His Website