2. 外语
  3. That people often experience trouble sleeping in a different bed in unfamiliar surroundings is a phenomenon known as the "first-

That people often experience trouble sleeping in a different bed in unfamiliar surroundings is a phenomenon known as the "first-

admin2017-08-15  77
问题     That people often experience trouble sleeping in a different bed in unfamiliar surroundings is a phenomenon known as the "first-night" effect. If a person stays in the same room the following night they tend to sleep more soundly. Yuka Sasaki and her colleagues at Brown University set out to investigate the origins of this effect.
    Dr. Sasaki knew the first-night effect probably has something to do with how humans evolved. The puzzle was what benefit would be gained from it when performance might be affected the following day. She also knew from previous work conducted on birds and dolphins that these animals put half of their brains to sleep at a time so that they can rest while remaining alert enough to avoid predators (捕食者). This led her to wonder if people might be doing the same thing. To take a closer look, her team studied 35 healthy people as they slept in the unfamiliar environment of the university’s Department of Psychological Sciences. The participants each slept in the department for two nights and were carefully monitored with techniques that looked at the activity of their brains. Dr. Sasaki found, as expected, the participants slept less well on their first night than they did on their second, taking more than twice as long to fall asleep and sleeping less overall. During deep sleep, the participants’ brains behaved in a similar manner seen in birds and dolphins. On the first night only, the left hemispheres (半球) of their brains did not sleep nearly as deeply as their right hemispheres did.
    Curious if the left hemispheres were indeed remaining awake to process information detected in the surrounding environment, Dr. Sasaki re-ran the experiment while presenting the sleeping participants with a mix of regularly timed beeps (蜂鸣声) of the same tone and irregular beeps of a different tone during the night. She worked out that, if the left hemisphere was staying alert to keep guard in a strange environment, then it would react to the irregular beeps by stirring people from sleep and would ignore the regularly timed ones. This is precisely what she found.
What did Dr. Sasaki do when she first did her experiment?
选项 A、She monitored the brain activity of participants sleeping in a new environment.
B、She recruited 35 participants from her Department of Psychological Sciences.
C、She studied the differences between the two sides of participants’ brains.
D、She tested her findings about birds and dolphins on human subjects.
答案A
解析 本题可参照文章的第2段。从文章的第2段可知，佐佐木博士在第一次实验时招募了35名志愿者，检测他们在陌生环境中睡觉时第一晚大脑的活动情况。据此可知，A项正确。B、C两项不正确，这两项只是其中的细节，并非主要内容。而且，佐佐木博士的实验验证了有关鸟类和海豚的发现，而不是在参与者身上测试，所以D项不正确。A项与文章的意思相符，因此A项为正确答案。
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