ok, but this insistance you keep making on classifying people as dead or alive is moot. it doesn't matter what we call them. Us saying they are dead is not evidence of a soul or any of the things described in an NDA being real, it simply means that humans call them dead. You can say a flatline EEG means they are "dead", what ever.
EEG doesn't work very well in this situation for a couple of reasons.
1. Unless you can show me otherwise, EEG readings are coming from equipment that is using a small number (3) of electrodes to read brain activity. When people do psychological research, to try and detect VERY small electrical signals, they use caps with dozens of electrodes. So, in these clinical settings, with only a small number of electrodes, you are not going to have close to enough power to detect what would be small and localized nuronal activation (more on this below). Further, it would be impractical to have a near-death potient equipped to a full EEG headset all the time, and it takes at least 20-30 min for experienced researchers and subjects to get the system on, meaning as someone is going into cardiac arrest, it would be unethical for doctors to try and get the system on someone. Now, it makes a lot of sense that doctors would use a much less sensitive tool than researchers, but if you are trying to argue that small amounts of brain activity are not causing NDEs, clinical EEG set ups and no pulse are not good examples. Unfortunatly, it would be unethical to do things like fMRI on dying people, which might support your argument, as it can detect very small levels of activity.
2. Which brings up, even in terms of equipment available to look for brain activity, EEG would be one of the least effective. It is obviously the easiest to use in a clinical setting, but it sums electrcal activity up over an area to produce a signal, and small activations can be missed. As sort if a mnemonic we learn, eeg is good for temporal bad for spatial, fmri is good for spatial, bad for temporal. We don't know how little activation is needed to produce what would be remembered as a NDE, and because of the way our brains fill in events, I'd wager it is not a lot.
And in terms of our brain filling in events, yes, obviously I'm not saying our memory is 100% wrong all the time, but like, this isn't your normal brain experience. This is like your eyewitness telling you the colour of the guys car, and he's blind.
So, this guy named Gazzanaga did a bunch of experiments on epilepsy patients who had their corpus collosium cut to stop their seizures spreading from one side of their brain to the other [the corpus collosium carries most of the information between the right and left side of the brain]. Because our eyes encode visual information on the oposite side [ipsolaterally: basically, what is seen on the left side of vision is processed on the right side of the brain], he could show different images to each side of the person's brain, and they wouldn't be able to communicate, because the corpus collosium was cut.
Now, we have what Gazzanaga called a "narrator", that puts together our explanation of the world around us, which is on the left side of our brain. So, when asked what they were looking at, the split brain patients could only report what was presented in their right cisual field. But, because the right side of the brain controls the left hand, if you had them point with their left hand to a picture of the object they saw, they would point to the image in the left visual field.
What is amazing, is you could then ask these people "You said you saw [the image in the right visual field] before, and you pointed to [the image in the left visual field], why was that?", and the subject's reply would be this hugely convoluted story about how as a child his dad once said there was this connection... blah blah blah.
So, people experiencing an NDE could have small activations, that, when remembered, because of this narrator, are complex events. Our memory systems work to elaborate on what are even false memories, so even the act of trying to remember what happened would cause new memories to be formed. Whatever you want to say about what this means for our memory systems, sure, but the fact is, even under optimal conditions, our memory is highly subject to distortions and elaboration, and "while dying" is hardly an optimal condition.
(most of this from Gazzanaga, M (2007?) Lecture at Wilfrid Laurier)