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As I was reading the text I came upon a section that I thought to be quite fascinating. It talked about people who have a brain that functions like two different people inside of the brain. This is of course the Split-Brain Personality. As I studied this topic ....

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.... the brain was by noticing brain damage to a particular area of the brain that was damaged. Such observations were first recorded some 5,000 years ago (Myers,1995). The most popular case is that of Phineas Gage a railroad worker that had severe frontal lobe damage. This happened when a rail road spike was shot through his head by a piece of dynamite. Miraculously he lived through the experience, but with a severe change in his personality. From this physiologists learned that personality was largely controlled from this point namely by removing a persons inhibitions. For the most part the brain has been a mystery that is waiting to be ope ....