I don't know a lot about multiple personality disorder. However, I find this topic really interesting. I will write what I know and think about this disorder.
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I believe that we all have several personalities inside us. Indeed, depending on a situation, we do not behave the same way and adapt our personality to a situation. For example, when one is at home, one can be kind, reliable and caring with one's family. At work, that same person may be strict and cold with colleagues. One can be a complete introvert and turn out to behave as an extrovert in a social event or in a situation to impress somebody.179Please respect copyright.PENANAc4XD1i68qN
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I believe we can talk about multiple personality disorder when the multiple personalities manifest themselves unconsciously of each other. Another characteristic may be that each personality consider the other as a completely different person. The changes between the personalities can be really drastic. One could see difference in the way of talking, the way of dressing, the way of behaving.
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The interesting point to analyse is the reason one gets diagnosed with this disorder. I believe that an extreme frustration in the society can trigger this disorder. As an individual with a certain personality, one can be helpless in achieving few tasks in the society. When this happens repeatedly, that person may think how it would be if he or she would have a different personality. That person would have a low self esteem. Comparisons made by other people in order to show how useless or helpless he or she is, might also aggravate the situation. At one point, a new personality might get created into the person. One that can achieve all those tasks that initially he or she could not. In a certain way, this could be also seen as a way the Human adapts to the environment.
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I am not an expert on this subject so if anything wrong in what I have written, I apologize in advance for that.