A new scientific explanation for near-death experiences

Many masses on their deathbeds account seeing a long corridor with a brilliant light source at the ending of it . Could it be heaven ? believably not . New enquiry shows that these dear - death visions may be linked to intense electrical surges that cause “ hyper real ” thinking in our brains .

A team of researcher found that during “ clinical death , ” rats exhibit a surge in head body process , with feature exchangeable to a highly aroused human encephalon .

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There are countless tales of people from all walks of sprightliness seeing bright lights and other vivid hallucination when they ’re at the brink of expiry . In fact , some estimation say that almost 20 percentage of multitude who come through cardiac arrest — where roue effectively discontinue flowing and the brain becomes starve of the oxygen it needs — account such penny-pinching - end experience .

It ’s long been assumed that once the mentality is cut off from its descent provision , it stops functioning , enunciate Jimo Borjigin , a molecular brain doctor at the University of Michigan . And some citizenry conclude that if the brain is no longer functioning , it ca n’t possibly be the source ofnear - death experiences , lending credenza to a more supernatural explanation for the phenomenon .

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That ’s why Borjigin resolve to look at other sources of activity in the dying brain . She chance on that there ’s been very little inquiry on electrical sign in the nous at once after cardiac catch . “ There was some enquiry done in rats a foresighted metre ago , where there was this clear pip after the heart stops , but nobody made a freehanded great deal about that , ” Borjigin told io9 . “ What if that little radar target turns out to be something significant ? ”

Borjigin originally became interested in this topic back in 2007 , when she was cultivate on a undertaking with her husband , Michael Wang . The couple was seek to figure out what happens to animals ’ circadian rhythms when they tolerate from a stroke , or a disturbance in blood supply to the brainpower . During their experiments , some of the animals pass from the induced strokes . Curiously , brainiac images showed a huge increment in certain neural chemicals during these brute ’ destruction .

“ After that I start up looking into everything that has to do with the conk process , ” Borjigin said . She dug into the scientific literature for anything that could explain what she and her husband see — and found herself on the national of near - death experiences . Though some write up claim that the unexplained experiences could n’t stem from head bodily process , she was n’t confident . “ If there is that kind of activity take place in the encephalon after last , it should be measureable . ”

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Investigating the Brain Waves of Death

To look into the potential neurophysiologicalbasis for near - end experiences , Borjigin , Wang and their colleagues decide to take EEG ( encephalogram ) readings of nine informer while they were awake , under anesthesia and undergo cardiac arrest . They looked particularly at gamma oscillations , or Vasco da Gamma waves . Neurons in the brain oscillate or fire at different frequencies , with these frequency bands correlating to different character ofbrain waves(delta , theta , alpha , beta and gamma ) . Gamma waves , Borjigin explains , occur at the highest of frequencies and therefore carry more information than other brain wave . They are also one of the feature film of cognizance .

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The squad incur several sign of conscious bodily function in all nine of the break down rats ’ head . First off , within the first 30 second after cardiac arrest , there was a shrewd growth in gamma absolute frequency power . But it was n’t just random firing — neurons across the brain evoke synchronously . Previous enquiry has suggested that this “ gamma coherence ” underlie conscious perception , such as when you focus all your attending on understanding something .

“ But what is really interesting is that the coherence [ in the dying rats ] is more than two - sheepcote higher than in their ignite DoS , ” Borjigin said . “ This suggests that after cardiac arrest , there is a sort of hyper - cognizance in the brain , with all of the neurons acting together in far more coherence than normal . ”

Additionally , the team found an increase in “ feedback connectivity . ” Information processing in the brain go on in two mode : Top - down and bottom - up . Bottom - up processing has to do with sensorial sentience , while top - down processing involves your will and intention , such as when you resolve to raise your subdivision . During anaesthesia , doctors dampen both kind of process to verify that patients are n’t cognisant of what ’s rifle on , and do n’t remember anything about the procedure .

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The investigator found that break down git showed an eight - fold increment in top - down summons and five - fold step-up in bottom - up processes following cardiac arrest . Borjigin advise that anything the rats get during this prison term would likely have seemed “ hyper - real . ” Interestingly , patients havedescribed near - last experiencesas being “ realer than actual . ”

Where the “Light” Comes From

Finally , the researchers saw cross - frequency coupling — where different electrical wave work together — in the bum ’ brainpower after cardiac arrest . They found pair between low - frequency gamma moving ridge and theta waves , as well as low - da Gamma waves with alpha waves . When theta waves couple with gamma undulation , it represents a witting control of the brain . Alpha - da Gamma yoke , on the other hand , is a feature film of ocular activation or visual cognisance , which includes internal visualization ( imagination ) — Borjigin propose this particular brain bodily process could be behind the lustrous lighter some multitude see during their skinny - death experience .

Taken together , the evidence indicate that the Einstein is adequate to of well - organized electric activity — specifically conscious processing — immediately following cardiac arrest , despite the fact that the brain experiences a sharp decrease in oxygen , and was previously thought to be non - functional during this time . These neurophysiological changes may very well be the cause of the near - dying experience people often account .

Though the study was conducted on rats , Borjigin believes the basic brain features of cardiac taking into custody should be husband in people . And if scientist do a human study , “ my prediction is that we are going to encounter a lot more info than we did in rats , ” she said .

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