hypatia said:
http://sulcus.berkeley.edu/mcb/165_001/papers/manuscripts/_97.html"This is a interesting paper on NDE, it talks about some of the neurochemistry
in our brains, which may shed some light.
While indeed the neurochemistry approach may appeal tentative, there are some counterindicators with this theory. I know that certain electrical stimuli of the temporal lobe have provoked visions and or hallucinations that also occurred with epilepsy patients who were about to have a seizure. This may or may not be the same effect that occurs when such drugs as LSD or Ketamine ar administered.
However, these experiences are usually highly hallucinatory qua contents while over 75% of the NDE-experiencers say to have had an even elevated level of conciousness.
I think there is (though being subjective) an important clue in this notion of conciousness.
A conscious experience has a property that a subconscious one (such as a dream or hallucination) lacks, being the “conscious interrupt control”,that I deducted from the term interrupt control that computers need in order to avoid infinite program loops.
This conscious interrupt control is the awareness to stop one mental or physical activity and start another one. In other words; it prevents our thoughts from being an infinite product of previous thoughts that would eventually lead to determinism. It could be looked upon as one of the basic constituents of consciousness itself and what ultimately gives rise to free will. The presence of this consciouss interrupt control and thus normal or elevated levels of consciousness is in most cases of hallucinatory dreams and drug induced experiences absent (they are in a way experienced passively), while it is reported in most cases of NDE’s.
However, this is classifying things as being black and white. Even hallucinatory experiences may yield a degree of reality. I am aware of one conscious (=lucid) dream that seems to be ‘surreal’ qua contents, but was shared by two people and is well documented in the PhD paper of William G Roll.
There are enough indicators that NDE’s are a genuine part of reality, but apart from the OBE’s that can be verified, they don’t always point in the direction of the objective reality we observe and clamp on to.
Does this show us that the reality of these experiences may just not be so objective as we would like it to be, emerging from an implicite reality that is out there, or does it indicate a mere occurence by chance?
The second assumption, that NDE’s may sprout from cerebral anoxia, the release of endorphins or random neuron firings in a dying brain is under discussion since Van Lommel (the lancet, 2001) published a study in which became clear that these NDE’s occur when a flat EEG is observed. No activity can be measured in the brain, which raises the question of how people can experience even higher levels of consciousness with coherent patterns, when you would predict random chaos hallucinations?