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This implies memories in mice are stored in triplicate, but I wonder if that's true or just a convenient grouping for observation. I also wonder what "inaccessible" means:
In contrast, the memory copy of the same event created by the late-born neurons is very strong at the beginning but fades over time, so that if one waits long enough, such a copy becomes inaccessible to the brain.
It could mean the memory and its side effects are gone or just the memory can't be made conscious anymore or that the memory isn't present even unconsciously anymore.
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