Phineas Gage was an American railroad constructer foreman; he was a very good and caring person. His is very famous for his survival to an incredible accident in the process of detonating a rock to create a railroad. His job was to detonate big rocks with TNT that blocked the path to create railroads. The process was to dig a hole in the rock and to stick in the TNT, so that it is in the middle of it. After this, he stuck sand into it and compressed it with a tamping rod so that the explosion pressure, would distribute equally. One day, when he was doing the compressing part of the job, a spark was created with the tamping rod and made the TNT explode, because Gage was with the rod in his hands, the pressure made the tamping rod trespass his eye and frontal part of his head. 
After this event happened he was translated to the hospital immediately; he was still alive. The doctor made what he needed to do, and then gave Gage 1 year in the hospital. After that year, he finally got out of the hospital and decided to continue in his same job. As a result of his injuries, he became a grumpy, selfish and mad person. He did not care of people and their problems anymore. He was expulsed from this job, because of his new personality, so he decided to do other jobs, until he found the only job that was good for him; he was a freak from a freak show. Because of the Phineas Gage’s accident, we could learn that the frontal part of the brain controls our personality. Brain localization is a very important discovery because with it, doctors and scientists can learn more about humans and the way they are affected when an accident happens in their brains.
The brain lateralization theory, explains that the left side of the brain, controls the right side of your body, and vice versa.
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