According to people who were on the verge of life and death, before going to the light often have different visions. Experts in the field of neurology have decided to study this question.
On it informs portal news of the world.
1/3 of all people who experienced clinical death, talks about the light at the end of the tunnel, about meeting with God and deceased loved ones. The experts share a similar hallucinations on left and right (those formed in the left brain hemisphere and right respectively).
Unfortunately, scientists do not know exactly the mechanisms that provoke vision. Most likely, the brain starts to create some images due to stress. During experiences in the organism strenuously produces some hormones for example endorphins. They can cause hallucinations.
Another version says that vision is the result of lack of oxygen. During clinical death, the brain can suffer oxygen deprivation. Something like the pilots are experiencing when accelerating. Lack of oxygen causes a disruption of the temporal lobes of the brain, which are responsible for information visualization and analysis of sounds.
It is also possible that hallucinations arise as a result of the dying cells of certain substances and random neural impulses.
Recall, an amazing story happened with Rihanna a Show skier from the UK. During an active holiday in the ski resort of St. Anton, which is in Austria, there was a fall: she fell down the slope as a result of collision with friends, and then felt a significant influx of snow. It turned out later, there was an avalanche.