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Effects of g-forcesAs g-force increases, or the longer it is sustained, the victim may suffer progressively: * Brownout- a loss of color vision * Tunnel vision - loss of peripheral vision, retaining only the center vision * Blackout a complete loss of vision but retaining consciousness. * G-LOC where consciousness is lost.Recovery is usually prompt following removal of g-force but a period of several seconds of disorientation may occur. Brief but vivid dreams have been reported to follow G-LOC.
A statistical analysis of more than 100 NDE subjects revealed that prior religious belief and prior knowledge of NDEs did not have an appreciable effect on the likelihood of having an NDE
Of course, this only scratches the surface of all the possible explanations for an NDE. NDEs seem to offer some hope that death is not necessarily something to be feared, nor is it the end of consciousness. Even science has a difficult time grasping death -- the medical community has struggled with specific definitions for clinical death, organ death and brain death for decades. For every aspect of an NDE, there is at least one scientific explanation for it. And for every scientific explanation, there seem to be five NDE cases that defy it.
Endorphins are endogenous opioid polypeptide compounds. They are produced by the pituitary gland and the hypothalamus in vertebrates during strenuous exercise, excitement, pain and orgasm, and they resemble the opiates in their abilities to produce analgesia and a sense of well-being. Endorphins have also been shown to be released in profound relaxation in a float tank. Endorphins work as "natural pain relievers."