Then the players completed computerized tests of their memory and other learning skills and had their brains scanned，using a complicated new MRI technique which can find structural changes in the brain that can’t be seen during most scans.

　　According to the data they presented at a Radiological Society of North America meeting last month，the researchers found that the players who had headed the ball more than about 1,100 times in the previous 12 months showed significant loss of white matter in parts of their brains involved with memory，attention and the processing of visual information，compared with players who had headed the ball fewer times.

　　This pattern of white matter loss is “similar to those seen in traumatic (外伤的) brain injury”，like that after a serious concussion，the researchers reported，even though only one of these players was reported to have ever experienced a concussion.

　　The players who had headed the ball about 1,100 times or more in the past year were also generally worse at recalling lists of words read to them，forgetting or fumbling the words far more often than players who had headed the ball less.

　　语篇解读：　研究表明，经常用头顶球会对大脑的内部构造造成严重影响，进而影响人的记忆力、注意力以及对视觉信息的处理能力。

　　1．The passage is most probably a________.

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