https://www.sciencedaily.com/releases/2020/05/200521151837.htm

He explained, "For memories to be useful, they have to have been well-formed during an event -- that is, they have to accurately reflect what actually happened.

"However, in the real world many memories are likely to be inaccurate -- especially in situations where the experience was brief, sudden or highly emotional, as can often occur during trauma. Inaccurate memories can also occur when the memory is poorly encoded, potentially as a result of subtle differences in how each person processes memory or because of disease like Alzheimer's or dementia."