It’s a fascinating topic to me. I got introduced to this fact as an argument for an afterlife, but I’m more interested in the biological aspect. What happens in the brain?
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If you think about the experiments done during the French revolution when executing people with guiliotines these are not considered scientifically valid as the results do not match later experiments. These were probably conducted under heavy confirmation bias causing people to see and interpret things that was not the case.
What we do know today is that death is not an instantaneous process. It is a rather long chain of events where each cell and each organ fails progressively. The brain do have an instantaneous “off” switch which makes you unconscious in traumatic events in order to conserve as much oxygen and energy as possible. This does usually trigger early on in the death process. But it is still possible to wake someone up from this condition as long as blood flow is maintained so some oxygen gets to the brain. This is why CPR is so important. If the neurons is starved for oxygen they will eventually die, cell by cell. This can trigger nearby neurons and cause some apparent neurotic activity. The same is true for the neurons in the spine and out to each muscle. Even dead bodies can have muscle spasms.
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