https://www.nature.com/articles/d41586-018-00107-4
This article describes how the patterns of neurons in human brains can be observed from data from their fMRI scans both when they are watching pictures of objects/people/ etc, and when they are recalling them from memory - the same pattern emerges.
After viewing a TV episode. the memory patterns of each person were the same for 50 scenes. They were even the same for people who only heard the scenes described but did not see them.
So this gives a clue about how a human memory could be altered/inserted verbally. I don`t know about deleting it.
The mouse studies involve injecting a special memory protein to make the lasers work, so that would not apply to humans.
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