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  3. To sleep. Perchance to file? Findings published online this week by the Proceedings of the National Academy of Sciences further

To sleep. Perchance to file? Findings published online this week by the Proceedings of the National Academy of Sciences further

admin2011-05-29  59
问题     To sleep. Perchance to file? Findings published online this week by the Proceedings of the National Academy of Sciences further support the theory that the brain organizes and stows memories formed during the day while the rest of the body is catching zzz’s.
    Gyorgy Buzsaki of Rutgers University and his colleagues analyzed the brain waves of sleeping rats and mice. Specifically, they examined the electrical activity emanating from the somatosensory neocortex (an area that processes sensory information) and the hippocampus, which is a center for learning and memory. The scientists found that oscillation in brain waves from the two regions appear to be intertwined. So-called sleep spindles (bursts of activity from the neocortex) were followed tens of milliseconds later by beats in the hippocampus known as ripples. The team posits that this interplay between the two brain regions is a key step in memory consolidation.
    A second study, also published online this week by the Proceedings of the National Academy of Sciences, links age-associated memory decline to high glucose levels.
    Previous research had shown that individuals with diabetes suffer from increased memory problems. In the new work, Antonio Convit of New York University School of Medicine and his collaborators studied 30 people whose average age was 69 to investigate whether sugar levels, which tend to increase with age, affect memory in healthy people as well. The scientists administered recall tests, brain scans and glucose tolerance tests, which measure how quickly sugar is absorbed from the blood by the body’s tissues. Subjects with the poorest memory recollection, the team discovered, also displayed the poorest glucose tolerance. In addition, their brain scans showed more hippocampus shrinkage than those of subjects better able to absorb blood sugar.
    "Our study suggests that this impairment may contribute to the memory deficits that occur as people age." Convit says. "And it raises the intriguing possibility that improving glucose tolerance could reverse some age-associated problems in cognition." Exercise End weight control can help keep glucose levels in check, so there may be one more reason to go to the gym.
In what way is memory related to hippocampus shrinkage?
选项 A、There is no relation between memory and hippocampus shrinkage.
B、The more the hippocampus shrinks, the poorer one’s memory.
C、The more the hippocampus shrinks, the better one’s memory.
D、The less the hippocampus shrinks, the poorer one’s memory.
答案B
解析 第四段最后一个句子中their brain scans，指上句中的Subjects with the poorest memory recollection的大脑扫描，所以选择B。
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