Deidre has a list of medicines she needs to buy from the drugstore. she quickly goes through the list and, believing she has memorized it, leaves the list behind when she steps out of her home. when she reaches the drugstore, however, she can only recall the names of the first few and the last few medicines on the list. deidre's inability to recall the names of the medicines in the middle of the list is an example of

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.