Answer:
the serial position
Explanation:
Serial position is a memory effect that refers to the ability to remember items in a list depending on the order of a presentation, with items displayed at the beginning or end of the list better remembered than those in the middle. Deidre is going through a moment where the serial position can be observed, as after rereading the list of medicines she should buy several times, she can only remember the first and last items on the list.