Answer:
Source amnesia
Step-by-step explanation:
Amnesia is a slight memory loss is a normal part of aging. But a significant loss of existing memories or the inability to form new memories may indicate the presence of amnesia. There are several types of amnesia, and the type Wallace is presenting is called source amnesia.
Source amnesia occurs when a person may remember certain information, but that person does not know how or where they had this information. Similar to what is happening with Wallace.