At 28:45: "Its almost impossible to demonstrate that there is no functioning, no activity..." Yeah right. Here is the protocol:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2772257/
It happens everyday, thousands upon thousands of times, in hospitals around the world. And people that have cardiac arrest generally fall into this class. This one is relevant to the discussion:
"Electroencephalography: Brain death confirmed by documenting the absence of electrical activity during at least 30 minutes of recording that adheres to the minimal technical criteria for EEG recording in suspected brain death as adopted by the American Electroencephalographic Society, including 16-channel EEG instruments. The ICU setting may result in false readings due to electronic background noise creating innumerable artifacts."
So, 30 min of no EEG activity is a lot longer than a typical resuscitation where the EEG may be flatlined for 1 to maybe 15 minutes. I can tell you 30 min of no blood flow to the brain means the brain is already beginning to liquify. However, Alex's point is correct. The EEG flatlines completely in seconds and is wholly absent by about 1 min. It is literally impossible for neuron electrical condition when cerebral blood flow is zero after about 6 minutes. At that point, all the neurotransmitter has been used up due to what is called "excitotoxicity".
Having read none of the NDE studies or researchers Alex cites, I do not know the relevant time frames of their patient's reported NDEs. But if they can be shown to occur after 6 min of complete cardiac arrest, then there is no way the brain is functioning electrically at that point.