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During the Stone Age, Europe and in the Americas, it was believed that evil spirits caused mental illnesses or abnormal behaviors. The most common treatment during this time period was trepanation. Trepanation was the chipping away at a skull to leave a whole so evil spirits could escape.
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People started to believe mental or stress gains momentum, and depression are regard by some disorder
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Paracelsus suggested that the moon and the starts, affected people's psychological functioning
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Philippe Pinel introduced moral therapy and creates French mental institutions.
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Dorthy Dix successfully campaigns for more humane treatment in the U.S mental institutions.
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John Grey believes insanity is the result of physical causes, thus de-emphasizing psychological treatments.
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Emil Kraepelin classifies various psychological disorders from a biological point of view and publishes work on diagnosis.