Why do we remember some things and not others? Why do I remember a black kite getting stuck in a tree, when I was 5yo, 38 years ago... but not what I had for dinner that night?
One theory I have heard/read is, we remember events better if they are traumatic or important at the time. This may be, but some long term memories I have... maybe most, just don't seem to fit into that. Many I only think of as "interesting" moments/images.
Other than my own memories, some of my kid's memories have lead me down this road (the road I will detail in a bit). I noticed some/many strong memories they have, are ones we discuss often, maybe "reinforcing" the memory.
And some of their memories are "enhanced" by info they learned afterward... Like say my kid remembers riding on my shoulders, through disney world, and later when talking about it, I comment that I almsot ran their head into a low hanging sign. Later, when relating the story to others, they include the part about almost hitting their heads, as though they were aware of it at the time... But in reality, they didn't know untill I told them later.
It's like they remembered the event, then later, remembered the time they remembered it. Like making a copy of a copy, but adding a post-it with extra info to the first copy, so it shows on the second, as an integral part.
This lead me to conclude that we remember things by remembering the memory. Not discounting the trauma angle, btw, but the reinforcemnt of the memory (remembering it) seems to "fix" it in the brain... But can also change it, info later learned about the memory may be added, new thoughts/sensations may be added/attached to it, etc.
And by remembering the memory, I mean contemplating it as well, which may be the actual mechanism that solidifies it, not so much the remembering itself... but that instant of seeing an amage, or thinking of a concept (remembering it) can hardly be separated from contemplating said memory. So I refer to the instant of remembering something, then thinking about it, together, as "remembering".
I did an experiment to see if remembering a memory fixes it. I watched a cartoon my kid was watching (I had not seen before) and picked a moment to try an remember. To avoid remembering a WOW moment, like a pointg where cartoon dog bonks the other with a giant hammer, I counted down from 5, and tried to grab the image when I hit 0.
Then a minute or two later, I tried to bring the image to mind. It was vague, but at least one part was detaled and fairly clear. A few minutes later, I tried again, it was still there. Then I tried to remember the scene a second before, nothing, tried to remember what the scene was right after, nothing came to mind.
I see the memory part of the brain maybe working like this (obviously too simple & leaving out a million factors I don't know)- All sensed stimuli is recorded onto a high rez, but limited depth, RAM chip. As time passes, the memories stored here, are compressed, creating vague senses of things, or adding to existing vague senses of things. The memory of a specific pretty flower turns into the general knowledge that there are pretty flowers. But memories on the RAM chip may be stored as specifics, if re-remembered while still specific. Then they are transfered to the long term ROM disc.
I'm sure the ram/rom comparison has been made before, but I just wanted to show how the re-remembering aspect possibly fit in. Anyway, try the experiment, see what you think... or remember.