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Which Nervous System is better?

A 40 minutes experiment was held, during which the probationers had to continuously perform difficult mental calculations. People with both strong and weak nervous systems took part in the experiment. People with weak nervous system were less productive by 35th minute than people of the strong type. However, probationers of the weak type showed higher general productiveness. It is explained by the fact that they had better results in the beginning of the test.