Human brain lives up to 10 minutes after human death, and the most astonishing thing is that it works normally.
More than one research have been carried out on brains of dead people and it has been found that for few minutes there is no affect on human brain and it works normally.
This an area which is not well researched but a recent experiment on rat proved that on death there is a gigantic energy release in the brain and then the brain works in same manner as a brain of sleeping man. In most of the cases the brain dies after 5 minutes because of lack of oxygen.
On some cases it may last longer especially if the weather is cold and moisturized. This is for patients and people who die a normal death, a fracture in the head or a bullet wound have different affect on human brain.hu