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Lack Of Sleep Can Affect Learning | |
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HEALTH TIPS - Tuesday, February 20, 2007
"News That Keeps You Healthy"
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Lack of sleep can affect learning
BOSTON, -- U.S. scientists have determined sleep depriva-
tion impairs memory for subsequent experiences by alter-
ing the function of the hippocampus. Sleep researchers
have known sleep occurring after an experience can be
critical to learning and memory but in the new study
Matthew Walker and colleagues at Harvard University
Medical School found sleep before an experience is also
critical for the normal functioning of memory systems.
The scientists deprived people of a night's sleep and
then asked them to observe and remember a large set of
picture slides for a subsequent recognition test. Follow-
ing a full night's sleep, the subjects were queried about
the slides. The researchers found sleep-deprived subjects
showed decreased activity in the hippocampus -- a brain
region important for memory -- relative to control sub-
jects who were not sleep-deprived while viewing the pic-
tures; sleep-deprived people also had poorer subsequent
recall abilities. The relationship of activation in other
brain areas to activation in the hippocampus was also
altered, suggesting sleep deprivation alters memory-encod-
ing strategies, the researchers reported. The study
appears in the March issue of the journal Nature Neuro-
science.
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Scientists find origin of ulcer bacteria
CAMBRIDGE, England, -- A British-led team of international
scientists has discovered the bacteria causing stomach
ulcers has been present in humans for more than 60,000
years. The finding, say the researchers, not only furthers
the understanding of a disease causing bacteria but also
offers a new way to study the migration and diversifica-
tion of early humans. The scientists from the University
of Cambridge, the Max Planck Institute in Berlin and the
Hanover Medical School, compared DNA sequence patterns of
humans and the Helicobacter pylori bacteria known to cause
most stomach ulcers. They found the genetic differences
between human populations that arose as they dispersed
from Eastern Africa over thousands of years are mirrored
in H. pylori. Human DNA analysis has shown that along the
major land routes out of Africa human populations become
genetically isolated -- the further from Eastern Africa a
population is the more different genetically it is compar-
ed to other human populations. Other research has shown
gradual differences in European populations, presumed to
be the result of Neolithic farmers moving northwards. The
H. pylori research team found nearly the same genetic dis-
tribution patterns in their results. The study appears
in the journal Nature.
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Children's asthma drug elicits good review
MELBOURNE, -- An Australian study shows children taking
the prescription drug montelukast for reoccurring sporadic
asthma miss fewer school days. The multicenter, randomized,
double-blind and placebo-controlled study also showed such
children had fewer unscheduled trips to their doctors and
caused their parents to take fewer days off work for their
care. Dr. Colin Robertson of the Royal Children's Hospital
in Melbourne and colleagues studied 202 children, ages 2
to 14, who were given either montelukast or a placebo by
their parents. All of the children had intermittent,
physician-diagnosed asthma. By the end of the yearlong
study, the patients treated with montelukast had 163 un-
scheduled health resource visits for their illness, as
compared with 228 in the placebo group. "Symptoms were
reduced by 14 percent, nights awakened by 8.6 percent,
days off from school or childcare by 37 percent and
parent time off from work by 33 percent," said Robertson.
Asthma is the most common chronic disorder of childhood
and intermittent asthma is the most common pattern of the
disease in children. The study is detailed in the American
Journal of Respiratory and Critical Care Medicine.
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