共用题干 第二篇Sleep Lets Brain File MemoriesTo sleep.Perchance to file?Findings published online this week by the Proceedings of the National Academy of Science further support the theory that brain organizes and stows memories formed during the day while the r

共用题干
第二篇

Sleep Lets Brain File Memories

To sleep.Perchance to file?Findings published online this week by the Proceedings of the National
Academy of Science further support the theory that 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 oscillations 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 level.
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 issues.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 and weights control can help keep glucose level in
check,so there may be one more reason to go to the gym.

What is the relation of memory to glucose tolerance,as is indicated by a research mentioned in Paragraph 4?
A:People with poor memory have high glucose tolerance.
B:People with good memory have low glucose tolerance.
C:Memory level has nothing to do with glucose tolerance.
D:The poorer the memory,the poorer the glucose tolerance.