Despite the fact that evolutionary logic has designed us with mechanisms that prevent us from dangers, our brain is also equipped with reward mechanisms that are activated when we are subjected to extreme experiences. The neuropsychologists have a good understanding of how the reward systems in the brain respond to fear. These are deep structures that involve the nerve signal dopamine which is released in the brain following extreme experiences. The feeling of transformation the people reported in the interviews may stem from the release of this hormone that creates feelings of optimism and happiness.