@bethisperfect, if someone has actually died then you can’t bring them back to life. But, if their heart has stopped beating or they have stopped breathing and you start that all up again, then they should have their memory when they wake up. If you don’t breathe for a long time, then the amount of oxygen getting to your brain is reduced and so parts of your brain can die during this time. If this happens then when you wake up, that bit of your brain will be damaged and so won’t work any more. If the damage occurs in the part of your brain that helps to store memory, then you may wake up without your memory.
Like Charlotte says, as long as there is brain function when everything else (lungs and heart) is brought back then you will keep your memories. There are plenty cases where people are brought back to life but the brain has been too badly starved of blood/oxygen that the person stays in a coma and never wakes up
The others pretty much answer your question. Where you might lose access to memory in your brain is when either through injury or stoke, a blood clot has blocked off sections and the neurons in your brain stop communicating. It’s all through electrical signals, and sometimes parts just shut down. happens with illness and age too. So you’d better make some good memories while you’re young worth remembering!
I think you are considering situations like accidents/when someone is drowning and saved / possibly road accident or something like that. In such cases there are 2 possibilities, if the brain is damaged and there is internal bleeding then the areas storing memory can be affected temporarily/permanently. 2) Trauma because of the accident can cause short term memory loss (usually temporary). …Worst case scenario if the blood supply to the brain stops for any reason there is a chance that the person will loose memory function/a part of it.
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