“…First, knowledge facilitates the use of memory strategies. The use of memory strategies develops rapidly from elementary school through high school (Coffman, Ornstein, McCall, & Curran, 2008), i.e., older children use more strategies for encoding and retrieving events and items than younger children (e.g., Kron-Sperl, Schneider, & Hasselhorn, 2008;Schneider, Kron-Sperl, & Hünnerkopf, 2009;Schneider, Kron, Hünnerkopf, & Krajewski, 2004).Second, knowledge makes memory items more discriminable and vivid and improves item-specific processing, indicating. It means that knowledge enhances the distinctiveness of specific items and produces age differences in children's the memory performance of children.…”