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  3. Of all the components of a good night’s sleep, dreams seem to be least within our control. In dreams, a window opens into a worl

Of all the components of a good night’s sleep, dreams seem to be least within our control. In dreams, a window opens into a worl

admin2015-01-15  57
问题     Of all the components of a good night’s sleep, dreams seem to be least within our control. In dreams, a window opens into a world where logic is suspended and dead people speak. A century ago, Freud formulated this revolutionary theory that dreams were the disguised shadows of our unconscious desires and fears. By the late 1970s, neurologists had switched to thinking of them as just "mental noise"—the random byproducts of the neural-repair work that goes on during sleep. Now researchers suspect that dreams are part of the mind’s emotional thermostat, regulating moods while the brain is "off-line". And one leading authority says that these intensely powerful mental events can be not only harnessed but to help us sleep and feel better. "It’s your dream," says Rosalind Cartwright, chair of psychology at Chicago’s Medical Center. "If you don’t like it, change it. "
    Evidence from brain imaging supports this view. The brain is as active during REM(rapid eye movement)sleep—when most vivid dreams occur—as it is when fully awake, says Dr. Eric Nofzinger at the University of Pittsburgh. But not all parts of the brain are equally involved; the limbic system(the "emotional brain")is especially active, while the prefrontal cortex(the center of intellect and reasoning)is relatively quiet. "We wake up from dreams happy or depressed, and those feelings can stay with us all day. " says Stanford sleep researcher Dr. William Dement.
    The link between dreams and emotions shows up among the patients in Cartwright’s clinic. Most people seem to have more bad dreams early in the night, progressing toward happier ones before awakening, suggesting that they are working through negative feelings generated during the day. Because our conscious mind is occupied with daily life we don’t always think about the emotional significance of the day’s events—until, it appears, we begin to dream.
    And this process need not be left to the unconscious. Cartwright believes one can exercise conscious control over recurring bad dreams. As soon as you awaken, identify what is upsetting about the dream. Visualize how you would like it to end instead; the next time it occurs, try to wake up just enough to control its course. With much practice people can learn to, literally, do it in their sleep.
    At the end of the day, there’s probably little reason to pay attention to our dreams at all unless they keep us from sleeping or "we wake up in panic", Cartwright says. Terrorism, economic uncertainties and general feelings of insecurity have increased people’s anxiety. Those suffering from persistent nightmares should seek help from a therapist. For the rest of us, the brain has its ways of working through bad feelings. Sleep—or rather dream—on it and you’ll feel better in the morning.
By referring to the limbic system, the author intends to show______.
选项 A、its function in our dreams
B、the mechanism of REM sleep
C、the relation of dreams to emotions
D、its difference from the prefrontal cortex
答案C
解析 本题可参照文章的第2段。从中可知，Eric Nofzinger博士说，在REM(眼睛快速运动)睡眠期间，大脑十分活跃，正如在完全清醒时一样。但是，并非大脑的所有部分都是这样。大脑边缘系统(“情感大脑”)尤其活跃，而前额叶皮质(理智的中心)则相对平静。无论我们从梦中醒来时是高兴还是沮丧，那些情感都可能整日伴随我们，Wil一liam Dement博士说。据此可知，作者提到大脑边缘系统是想说明做梦与情感之间的联系。C项与作者的意图相符，因此C项为正确答案。
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