Some students get so nervous before a test; they do poorly even if they know the material.Sian Beilock,a psychology professor at the University of Chicago,has studied these highly anxious test-takers.

　　“They start worrying about the results.They might even start worrying about whether this exam is going to prevent them from getting into the college they want.And when we worry,it actually uses up attention and memory resources.I talk about it as your cognitive(认知的)horsepower that you could otherwise(否则，在其它方面) be using to focus on the exam,”says Sian Beilock.

　　The researchers tested the idea on a group of 20 anxious college students.They gave them two short math tests.After the first one,they asked the students to either sit quietly or write about their feelings about the coming second test.

　　The researchers added to the pressure.They told the students that those who did well on the second test would get money.They also told them that their performances would affect other students as part of a team effort.

　　Professor Beilock says those who sat quietly scored an average of 20% worse on the second test.But the students who had written about their fears improved their performances by an average of 5%.

　　Next,the researchers used younger students in a biology class.They told them before final exams either to write about their feelings or to think about things unrelated to the test.

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