Is it normal to have massive gaps in one’s memory? And if so, why do our brains do this?

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Are our brains just not capable of holding that much information?

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It can be normal. Your brain tosses out information that is useless. One example is that feeling of being watched. You remember the times you were right because that was useful. But you don’t remember all the times you were wrong since “Nothing happened” is not useful information, accidentally making you think its something special when you are right.

And it can be very selective. Like you won’t remember a lot of classes you take in school, even though you remember the information you learned during them.

That being said, if you think you’ve lost an unusual amount of information, you may want to see a doctor just to be sure.

As for why forgetting happens at all…We don’t know. its the subject of ongoing research. What we do know is that our brains can hold quite a lot of information, more than anyone has ever used.

I don’t think it’s a matter of ability. Though vanishingly rare, there are a few genuine cases of eidetic (photographic) memory and I believe they were otherwiae normal healthy people. So the human brain must be capable of it.