Doctors in a Canadian intensive care unit stumbled on a very strange case last year - when life support was turned off for four terminal patients, one of them showed persistent brain activity even after they were declared clinically dead. Read full article...
Source: https://www.sciencealert.com/brain-activity-has-been-recorded-as-much-as-10-minutes-after-deathIf you ask a longdistance-diver so he will tell you, that it is possible for a normal man. Ok the person lost his heartbeat but he only lay in the bed and doesn't do anything. It's logical that the brain doesn't functioning like a switch off of a lamp.
I question what quality of brain activity? What areas of the brain? We know the pooling blood would have some usable oxygen and nutrients, so it is understandable that complete tissue death would take time. So does any of remaining brain activity contribute to cognitive awareness?
When we think about so called near-deathexperience so I think that the Occipitalregion has a long activity.
Certainly humbles you and makes you mindful of conversations around the death bed