Here's an interesting concept that I think would be interesting to build into a story.
Computers have two ways of accessing memory. One laser writes the original memory. The other laser reads it. Two separate lasers performing different functions.
When a brain writes memory, it uses the same bits and pieces as it uses when accessing the memory later. Because of this, just by accessing a memory, it changes.
There's quite a lot of science behind this and the implications are extraordinary.
Christopher Priest wrote a novel called "The Extremes" where something like this occurs, only it is based in virtual reality, not someone's memories.
The concept is fascinating to me. A villian could do some serious damage if he knew how to access the memories of others and modify them. So could a well-intentioned protagonist. Or meddling parent. The possibilities are endless.