The idea that we use only a small part of the brain dates back toP1 animal experiments in the 19th century. When scientists stimulated (刺激) a specificW2 part of the brain,

　　the animal moved its leg or tail. If a tiny part of the brain could do something so great, what was the use of the rest of the brain? Some scientists assumedW3 that large parts of the brain were simply useless.

　　Then, in the early 20th century, scientists observed that stimulating certain parts of the brain had no physical effects. They named these seemingly useless parts of the brain the “silent cortex”. Today we know that in humans, much of the “silent cortex” is actually devoted toP2 complex activities like language, learning, and imagining.

　　Brain scans have shown that different parts of the brain become much more active as we shift (切换) our attention and focus, but even as we sleep, many areas of the brain are extremelyW4 active. Would you be smarter if your entire brain constantly worked to maximum capacity (能力)? Interestingly enough, the oppositeW5 is probably true. The less brain activity you need to perform a given task, the more the brain as a whole is able to do.S

　　研究发现，人们一生中仅仅使用了大脑的1/10，研究者通过扫描大脑来研究是否可以激活大脑的睡眠区域，使人类变得更聪明。

　　5．Why does the opinion mentioned in Paragraph 1 seem appealing?

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