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【单选题】

New Brain Cells Love to Learn
Wisdom in old age depends on a fresh supply of new brain cells, a study in mice suggests. When mature mice learn a new task, their newly generated brain cells are three times more active than their old ones, the researchers found. The findings add to a growing body of evidence that the brain needs a steady addition of new cells to maintain its mental faculties.
Paul Frankland at the Hospital for Sick Children in Toronto, Ontario, Canada, and colleagues injected a group of mice with a chemical agent that stains only those cells born in the animals’ brains at the time of injection.
One week later, the team taught some of the mice how to navigate through a maze (迷宫), before sacrificing them to yse the cells in a region of the brain called the hippocampus(海马体),which is key to learning and memory. In stages, the rest of the mice also underwent this paired process of learning and hippocampal examination at increasing time intervals from the initial injection.
Frankland’s team ysed the mice’s stained hippocampal cells for key proteins—evidence that the cells were active and forming the new neural connections vital for learning. The team found that the stained cells had undergone significantly more activity in the mice that had learned the maze soon after the injection-when the stained cells were newly generated.
For example, those that had learned the maze six weeks after the injection had three times as much "activity" in their stained cells as those mice that learned the maze eight weeks after injection, when the stained cells were fully mature. Cells examined at less than six weeks’ old at the time of learning did not show as much activity as at six weeks, however. According to Frankland, this suggests that when neurons reach six weeks of age they are specifically recruited to form the brain networks that support new memories.
"The results strengthen the link between new cells in the brain and learning-and shows more convincingly that they have a functional role," Frankland says. He believes the study is the first to provide positive evidence that newly generated brain cells are more active than old ones.
New Brain Cells Love to LearnWhat does Frankland think of the study

A.
The results are more convincing in proving the link between new cells in brain and learning.
B.
It is the first one trying to prove that newly generated brain cells are more active than old ones.
C.
It proves that new cells in brains have a functional role.
D.
It was conducted in a more scientific way than the studies before it.
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【单选题】你想利用大鼠学习走迷宫的实验范式来研究观察者偏见对实验结果的影响。以下实验流程不正确的是

A.
给主试一个秒表和一个迷宫装置,告诉主试记录大鼠从放入迷宫到走出迷宫的时间作为实验数据。
B.
招募十名不懂心理学的大学生作为主试,每人分配两组大鼠,并且告知他们拿到的大鼠哪个是高能力组、哪个是低能力组。
C.
实验结果发现高能力大鼠走出迷宫的时间均值比低能力大鼠30秒,于是你得到结论观察者偏见对实验结果有影响。
D.
随机选择二十组每组 10只没有走过迷宫的同龄大鼠,每组雌雄各半,随机标记为十个高能力组和十个低能力组。
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【单选题】你想利用大鼠学习走迷宫的实验范式来研究观察者偏见对实验结果的影响。以下实验流程不正确的是
A.
给主试一个秒表和一个迷宫装置,告诉主试记录大鼠从放入迷宫到走出迷宫的时间作为实验数据。
B.
招募十名不懂心理学的大学生作为主试,每人分配两组大鼠,并且告知他们拿到的大鼠哪个是高能力组、哪个是低能力组。
C.
实验结果发现高能力大鼠走出迷宫的时间均值比低能力大鼠30秒,于是你得到结论观察者偏见对实验结果有影响。
D.
随机选择二十组每组 10只没有走过迷宫的同龄大鼠,每组雌雄各半,随机标记为十个高能力组和十个低能力组。
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