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http://www.wpxi.com/news/national/imagine-being-dead-and-knowing-youre-dead-thats-what-happened-in-a-new-study/627155103

Citando:
"To do so, they examined individuals who suffered cardiac arrest, but were later revived. The scientists noted that death was defined by when the heart stops and blood stops flowing to the brain.

During the evaluation, many patients were able to recall full conversations and visuals, and in some cases, participants even reported hearing they had been pronounced dead. 

"They'll describe watching doctors and nurses working; they'll describe having awareness of full conversations, of visual things that were going on, that would otherwise not be known to them," lead author Sam Parnia told Live Science.

Scientists confirmed the patients’ stories with doctors and nurses present at the time of death, and were stunned to hear what the subjects remembered.

Why is there still brain activity after death?

Brain death is a process. It takes up to 20 seconds before brain waves are no longer detectable. Once they aren’t, a set of cellular processes take place that eventually result in brain death. And this could occur hours after the heart has stopped, Parnia said. 

"If you manage to restart the heart, which is what CPR attempts to do, you'll gradually start to get the brain functioning again. The longer you're doing CPR, those brain cell death pathways are still happening — they're just happening at a slightly slower rate," he said.

The scientists are now expanding their ongoing experiment, which will be the largest of its kind, to investigate the occurrences of consciousness after death and how it may affect the rest of a person’s life if they are revived."