Eli5 How is it possible for people to forget things they studied for years?

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Like highschool or even university level studies where someone actually studies and understands their subjects then finds himself a few years later with ZERO memory of the things he studied? where does the information go? is it lost forever?

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Anonymous 0 Comments

The information is there, but it becomes misfiled in a way. The indexing in our brain is not like a hard drive and if we don’t keep accessing the memory, at some point the triggers that lead to that memory get weaker and the memory is ‘lost’ until something causes it to pop back

You ever smell something or hear something and a memory suddenly pops into your head you didn’t really ‘remember’ until that very moment?

Another similar scenario, you walk into a room and forgot why you walked into there? You didn’t forget, but the memory of the reason is inaccessible to you because you lost the ‘index’ to that memory. So you retrace your steps in an effort to find the ‘index’ and when you look at the the cats bowl again, it pops into your head, “I needed to get a bottle of water.”

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