Professor wallace studies memory in people who have had strokes. professor hansen studies people who claim to have clear memories of events that happened over three decades ago. such research on the extremes of memory:

The answer is helps us to understand how memory works.
By studying various memories from different type of person, Professor wallace has helped us in understanding which factors could diminish or enchance our memories. Understanding this will be a really important information that could be utilized in creating drugs to fight off the symtoms that caused memory loss for example.