Chapter 16. None
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By Katy Waldman On May 10, 1915, renowned poet-cum-cranky-recluse Robert Frost gave a lecture to a group of schoolboys in Cambridge, Massachusetts. “Sounds in the mouths of men,” he told his audience, “I have found to be the basis of all effective expression.” Frost spent his career courting “the imagining ear”—that faculty of the reader that assigns to each sentence a melodic shape, one captured from life and tailored to a specific emotion. In letters and interviews, he’d use the example of “two people who are talking on the other side of a closed door, whose voices can be heard but whose words cannot be distinguished. Even though the words do not carry, the sound of them does, and the listener can catch the meaning of the conversation. This is because every meaning has a particular sound-posture.” Frost’s preoccupation with the music of speech—with what we might call “tone of voice,” or the rise and fall of vocal pitch, intensity, and duration—has become a scientific field. Frost once wrote his friend John Freeman that this quality “is the unbroken flow on which [the semantic meanings of words] are carried along like sticks and leaves and flowers.” Neuroimaging bears him out, revealing that our brains process speech tempo, intonation, and dynamics more quickly than they do linguistic content. (Which shouldn’t come as a huge surprise: We vocalized at each other for millions of years before inventing symbolic language.) Psychologists distinguish between the verbal channel—which uses word definitions to deliver meaning—and the vocal channel—which conveys emotion through subtle aural cues. The embedding of feelings in speech is called “emotional prosody,” and it’s no accident that the term prosody (“patterns of rhythm or sound”) originally belonged to poetry, which seeks multiple avenues of communication, direct and indirect. Frost believed that you could reverse-engineer vocal tones into written language, ordering words in ways that stimulated the imagining ear to hear precise slants of pitch. He went so far as to propose that sentences are “a notation for indicating tones of voice,” which “fly round” like “living things.”
By David Shultz Is my yellow the same as your yellow? Does your pain feel like my pain? The question of whether the human consciousness is subjective or objective is largely philosophical. But the line between consciousness and unconsciousness is a bit easier to measure. In a new study of how anesthetic drugs affect the brain, researchers suggest that our experience of reality is the product of a delicate balance of connectivity between neurons—too much or too little and consciousness slips away. “It’s a very nice study,” says neuroscientist Melanie Boly at the University of Wisconsin, Madison, who was not involved in the work. “The conclusions that they draw are justified.” Previous studies of the brain have revealed the importance of “cortical integration” in maintaining consciousness, meaning that the brain must process and combine multiple inputs from different senses at once. Our experience of an orange, for example, is made up of sight, smell, taste, touch, and the recollection of our previous experiences with the fruit. The brain merges all of these inputs—photons, aromatic molecules, etc.—into our subjective experience of the object in that moment. “There is new meaning created by the interaction of things,” says Enzo Tagliazucchi, a physicist at the Institute for Medical Psychology in Kiel, Germany. Consciousness ascribes meaning to the pattern of photons hitting your retina, thus differentiating you from a digital camera. Although the brain still receives these data when we lose consciousness, no coherent sense of reality can be assembled. © 2016 American Association for the Advancement of Science.
Link ID: 21830 - Posted: 01.27.2016
Nell Greenfieldboyce The state of New Jersey has been trying to help jurors better assess the reliability of eyewitness testimony, but a recent study suggests that the effort may be having unintended consequences. That's because a new set of instructions read to jurors by a judge seems to make them skeptical of all eyewitness testimony — even testimony that should be considered reasonably reliable. Back in 2012, New Jersey's Supreme Court did something groundbreaking. It said that in cases that involve eyewitness testimony, judges must give jurors a special set of instructions. The instructions are basically a tutorial on what scientific research has learned about eyewitness testimony and the factors that can make it more dependable or less so. "The hope with this was that jurors would then be able to tell what eyewitness testimony was trustworthy, what sort wasn't, and at the end of the day it would lead to better decisions, better court outcomes, better justice," says psychologist David Yokum. Yokum was a graduate student at the University of Arizona, doing research on decision-making, when he and two colleagues, Athan Papailiou and Christopher Robertson, decided to test the effect of these new jury instructions, using videos of a mock trial that they showed to volunteers. © 2016 npr
Keyword: Learning & Memory
Link ID: 21828 - Posted: 01.27.2016
By Jane E. Brody. About 15 years ago, I was invited to join a knitting group. My reluctant response — “When would I do that?” — was rejoined with “Monday afternoons at 4,” at a friend’s home not three minutes’ walk from my own. I agreed to give it a try. My mother had taught me to knit at 15, and I knitted in class throughout college and for a few years thereafter. Then decades passed without my touching a knitting needle. But within two Mondays in the group, I was hooked, not only on knitting but also on crocheting, and I was on my way to becoming a highly productive crafter. I’ve made countless afghans, baby blankets, sweaters, vests, shawls, scarves, hats, mittens, caps for newborns and two bedspreads. I take a yarn project with me everywhere, especially when I have to sit still and listen. As I’d discovered in college, when my hands are busy, my mind stays focused on the here and now. It seems, too, that I’m part of a national resurgence of interest in needle and other handicrafts, and not just among old grannies like me. The Craft Yarn Council reports that a third of women ages 25 to 35 now knit or crochet. Even men and schoolchildren are swelling the ranks, among them my friend’s three grandsons, ages 6, 7 and 9. Last April, the council created a “Stitch Away Stress” campaign in honor of National Stress Awareness Month. Dr. Herbert Benson, a pioneer in mind/body medicine and author of “The Relaxation Response,” says that the repetitive action of needlework can induce a relaxed state like that associated with meditation and yoga. Once you get beyond the initial learning curve, knitting and crocheting can lower heart rate and blood pressure and reduce harmful blood levels of the stress hormone cortisol. But unlike meditation, craft activities result in tangible and often useful products that can enhance self-esteem. I keep photos of my singular accomplishments on my cellphone to boost my spirits when needed. © 2016 The New York Times Company
Link ID: 21826 - Posted: 01.27.2016
James Gorman Spotted hyenas are the animals that got Sarah Benson-Amram thinking about how smart carnivores are and in what ways. Dr. Benson-Amram, a researcher at the University of Wyoming in Laramie, did research for her dissertation on hyenas in the wild under Kay E. Holekamp of Michigan State University. Hyenas have very complicated social structures and they require intelligence to function in their clans, or groups. But the researchers also tested the animals on a kind of intelligence very different from figuring out who ranks the highest: They put out metal boxes that the animals had to open by sliding a bolt in order to get at meat inside. Only 15 percent of the hyenas solved the problem in the wild, but in captivity, the animals showed a success rate of 80 percent. Dr. Benson-Amram and Dr. Holekamp decided to test other carnivores, comparing species and families. They and other researchers presented animals in several different zoos with a metal puzzle box with a treat inside and recorded the animals’ efforts. They tested 140 animals in 39 species that were part of nine families. They reported their findings on Monday in the Proceedings of the National Academy of Sciences. They compared the success rates of different families with absolute brain size, relative brain size, and the size of the social groups that the species form in the wild. Just having a bigger brain did not make difference, but the relative size of the brain, compared with the size of the body, was the best indication of which animals were able to solve the problem of opening the box. © 2016 The New York Times Company
Ian Sample Science editor Genetically modified (GM) monkeys that develop symptoms of autism have been created to help scientists discover treatments for the condition. The macaques carry a genetic fault that causes a rare disorder in humans called MeCP2 duplication syndrome. This produces a wide range of medical conditions, some of which mirror those seen in autism, such as difficulties with social interactions. Researchers say groups of the GM monkeys could be used to identify brain circuits involved in common autistic behaviours and to test new treatments designed to alleviate the symptoms. Because the monkeys pass the genetic defects on to their offspring, scientists can breed large populations of the animals for medical research. A group of 200 monkeys has been established at the scientists’ lab in China. The research, described in the journal Nature, paves the way for more varieties of GM monkeys that develop different mental and psychiatric problems which are almost impossible to study in other animals. “The first cohort of transgenic monkeys shows very similar behaviour to human autism, including increased anxiety, but most importantly, defects in social interactions,” said Zilong Qiu who led the research at the Institute of Neuroscience in Shanghai. © 2016 Guardian News and Media Limited or it
By Esther Landhuis Amid gloomy reports of an impending epidemic of Alzheimer’s and other dementias, emerging research offers a promising twist. Recent studies in North America, the U.K. and Europe suggest that dementia risk among seniors in some high-income countries has dropped steadily over the past 25 years. If the trend is driven by midlife factors such as building “brain reserve” and maintaining heart health, as some experts suspect, this could lend credence to staying mentally engaged and taking cholesterol-lowering drugs as preventive measures. At first glance, the overall message seems somewhat confusing. Higher life expectancy and falling birth rates are driving up the global elderly population. “And if there are more 85-year-olds, it’s almost certain there will be more cases of age-related diseases,” says Ken Langa, professor of internal medicine at the University of Michigan. According to the World Alzheimer Report 2015 (pdf), 46.8 million people around the globe suffered from dementia last year, and that number is expected to double every 20 years. Looking more closely, though, new epidemiological studies reveal a surprisingly hopeful trend. Analyses conducted over the last decade in the U.S., Canada, England, the Netherlands, Sweden and Denmark suggest that “a 75- to 85-year-old has a lower risk of having Alzheimer’s today than 15 or 20 years ago,” says Langa, who discussed the research on falling dementia rates in a 2015 Alzheimer’s Research & Therapy commentary (pdf). © 2016 Scientific America
Link ID: 21821 - Posted: 01.26.2016
By SINDYA N. BHANOO Climate change may affect wood rats in the Mojave Desert in a most unusual way. A new study finds that warmer weather reduces their ability to tolerate toxins in the creosote bush, which they rely on for sustenance. The consequences may be dire for the wood rats. “There’s not much more they can eat out there,” said Patrice Kurnath, a biologist at the University of Utah and one of the study’s authors. She and her colleagues reported their findings in Proceedings of the Royal Society B: Biological Sciences. The leaves of the creosote bush contain a resin full of toxic compounds. They are known to cause kidney cysts and liver failure in laboratory rats. Wild wood rats, however, generally tolerate the poisons. Ms. Kurnath and her colleagues monitored the wood rats as they ate the leaves in warmer temperatures — around 83 degrees Fahrenheit. Although highs in the Mojave can reach the 80s and 90s during the summer, much of the year is cooler. The rats became less tolerant of the toxins and began to lose weight. The reason may have to do with how the liver functions in warmer weather, Ms. Kurnath said. The liver is the body’s primary detoxifying organ. When a mammalian liver is active, it increases internal body temperature. “In warmer weather, maybe you’re not producing huge amounts of heat and you’re not breaking down the toxins,” Ms. Kurnath said. © 2016 The New York Times Company
By Brian Owens Guy Rouleau, the director of McGill University’s Montreal Neurological Institute (MNI) and Hospital in Canada, is frustrated with how slowly neuroscience research translates into treatments. “We’re doing a really shitty job,” he says. “It’s not because we’re not trying; it has to do with the complexity of the problem.” So he and his colleagues at the renowned institute decided to try a radical solution. Starting this year, any work done there will conform to the principles of the “open- science” movement—all results and data will be made freely available at the time of publication, for example, and the institute will not pursue patents on any of its discoveries. Although some large-scale initiatives like the government-funded Human Genome Project have made all data completely open, MNI will be the first scientific institute to follow that path, Rouleau says. “It’s an experiment; no one has ever done this before,” he says. The intent is that neuroscience research will become more efficient if duplication is reduced and data are shared more widely and earlier. Opening access to the tissue samples in MNI’s biobank and to its extensive databank of brain scans and other data will have a major impact, Rouleau hopes. “We think that it is a way to accelerate discovery and the application of neuroscience.” After a year of consultations among the institute’s staff, pretty much everyone—about 70 principal investigators and 600 other scientific faculty and staff—has agreed to take part, Rouleau says. Over the next 6 months, individual units will hash out the details of how each will ensure that its work lives up to guiding principles for openness that the institute has developed. They include freely providing all results, data, software, and algorithms; and requiring collaborators from other institutions to also follow the open principles. © 2016 American Association for the Advancement of Science.
Link ID: 21813 - Posted: 01.23.2016
Timothy Egan This weekend, I’m going to the Mojave Desert, deep into an arid wilderness of a half-million acres, for some stargazing, bouldering and January sunshine on my public lands. I won’t be out of contact. I checked. If Sarah Palin says something stupid on Donald Trump’s behalf — scratch that. When Sarah Palin says something stupid on Donald Trump’s behalf, I’ll get her speaking-in-tongues buffoonery in real time, along with the rest of the nation. The old me would have despised the new me for admitting such a thing. I’ve tried to go on digital diets, fasting from my screens. I was a friend’s guest at a spa in Arizona once and had so much trouble being “mindful” that they nearly kicked me out. Actually, I just wanted to make sure I didn’t miss the Seahawks game, mindful of Seattle’s woeful offensive line. In the information blur of last year, you may have overlooked news of our incredibly shrinking attention span. A survey of Canadian media consumption by Microsoft concluded that the average attention span had fallen to eight seconds, down from 12 in the year 2000. We now have a shorter attention span than goldfish, the study found. Attention span was defined as “the amount of concentrated time on a task without becoming distracted.” I tried to read the entire 54-page report, but well, you know. Still, a quote from Satya Nadella, the chief executive officer of Microsoft, jumped out at me. “The true scarce commodity” of the near future, he said, will be “human attention.” Putting aside Microsoft’s self-interest in promoting quick-flash digital ads with what may be junk science, there seems little doubt that our devices have rewired our brains. We think in McNugget time. The trash flows, unfiltered, along with the relevant stuff, in an eternal stream. And the last hit of dopamine only accelerates the need for another one. © 2016 The New York Times Company
Link ID: 21812 - Posted: 01.23.2016
Videos just discovered show the first people ever to be treated for the symptoms of Parkinson’s disease. The footage, hidden for half a century, shows Chilean miners with severe movement problems improving on daily doses of L-dopa. The videos were filmed by George Cotzias at Brookhaven National Laboratory in Upton, New York. In 1963, while studying the toxic effects of manganese in human tissues, Cotzias learned of four workers in the Corral del Quemado mine in Andacollo, Chile, who had developed a syndrome called manganism – which resembled Parkinson’s – through inhaling manganese dust. Cotzias travelled to Chile to include the miners in a trial of leva-dopa, a chemical building block that the body converts into dopamine, low levels of which cause uncontrolled movements in people with Parkinson’s. L-dopa was being tested in Parkinson’s patients around the same time but with little success – even small amounts caused adverse side-effects that prevented a high enough dose reaching the brain. The footage clearly shows the severe problems with walking and turning miners had before treatment. After several months of receiving a daily dose of L-dopa, they were able to feed themselves, shave, tie their shoelaces, and run. “It’s a very important part of the history of neurology,” says Marcelo Miranda, a researcher at Clinica Las Condes in Santiago, Chile, who found the footage, some of which was shown at a conference in the 1960s, but hasn’t been seen since. “It’s the only available document of that period that shows the first patients with Parkinson’s symptoms treated with L-dopa and their extraordinary response.” © Copyright Reed Business Information Ltd.
Link ID: 21811 - Posted: 01.23.2016
By Elizabeth Pennisi PACIFIC GROVE, CALIFORNIA—Bats have an uncanny ability to track and eat insects on the fly with incredible accuracy. But some moths make these agile mammals miss their mark. Tiger moths, for example, emit ultrasonic clicks that jam bat radar. Now, scientists have shown that hawk moths (above) and other species have also evolved this behavior. The nocturnal insects—which are toxic to bats—issue an ultrasonic “warning” whenever a bat is near. After a few nibbles, the bat learns to avoid the noxious species altogether. The researchers shot high-speed videos of bat chases in eight countries over 4 years. Their studies found that moths with an intact sound-producing apparatus—typically located at the tip of the genitals—were spared, whereas those silenced by the researchers were readily caught. As the video shows, when the moths hear the bat’s clicks intensifying as it homes in, they emit their own signal, causing the bat to veer off at the last second. It could be that, like the tiger moths, the hawk moths are jamming the bat’s signal. But, because most moth signals are not the right type to interfere with the bat’s, the researchers say it’s more likely that the bat recognizes the signal and avoids the target on its own. Presenting here last week at a meeting of the American Society of Naturalists, the researchers say this signaling ability has evolved three times in hawk moths and about a dozen more times overall among other moths. © 2016 American Association for the Advancement of Science
Link ID: 21810 - Posted: 01.23.2016
By Geoffrey Giller The experience of seeing a lightning bolt before hearing its associated thunder some seconds later provides a fairly obvious example of the differential speeds of light and sound. But most intervals between linked visual and auditory stimuli are so brief as to be imperceptible. A new study has found that we can glean distance information from these minimally discrepant arrival times nonetheless. In a pair of experiments at the University of Rochester, 12 subjects were shown projected clusters of dots. When a sound was played about 40 or 60 milliseconds after the dots appeared (too short to be detected consciously), participants judged the clusters to be farther away than clusters with simultaneous or preceding sounds. Philip Jaekl, the lead author of the study and a postdoctoral fellow in cognitive neuroscience, says it makes sense that the brain would use all available sensory information for calculating distance. “Distance is something that's very difficult to compute,” he explains. The study was recently published in the journal PLOS ONE. Aaron Seitz, a professor of psychology and neuroscience at the University of California, Riverside, who was not involved in the work, says the results may be useful clinically, such as by helping people with amblyopia (lazy eye) improve their performance when training to see with both eyes. And there might be other practical applications, including making virtual-reality environments more realistic. “Adding in a delay,” says Nick Whiting, a VR engineer for Epic Games, “can be another technique in our repertoire in creating believable experiences.” © 2016 Scientific American,
Link ID: 21807 - Posted: 01.21.2016
By David Shultz It’s a familiar image: a group monkeys assembled in a line, picking carefully through each other’s hair, eating any treasures they might find. The grooming ritual so common in many primate species serves to both keep the monkeys healthy as well as reinforce social structures and bonds. But according to new research on vervet monkeys (Chlorocebus pygerythrus, seen above), the behavior may also improve a pelt’s insulation by fluffing it up like a duvet, scientists report in the American Journal of Primatology. To test the difference between groomed or ungroomed fur, the team manually combed vervet monkey pelts either with or against the grain for 50 strokes. The fluffed up “backcombed” pelts simulated a recently groomed monkey, whereas the flattened pelts simulated an ungroomed state. Using a spectrophotometer, the researchers then measured how much light was reflected by each pelt and calculated the pelt’s total insulation. They found that a thicker, fluffier coat could improve a monkey’s insulation by up to 50%, keeping the animal warmer in the cold and cooler in the heat. Thus, grooming may help the vervets maintain a constant body temperature with less effort, freeing up more energy for sex, foraging, and participating in monkey society. In the face of climate change, the authors note, such flexibility could soon become enormously important. © 2016 American Association for the Advancement of Science.
By David Shultz A rat navigating a maze has to rank somewhere near the top of science tropes. Now, scientists report that they’ve developed an analogous test for humans—one that involves driving through a virtual landscape in a simulated car. The advance, they say, may provide a more sensitive measure for detecting early signs of Alzheimer’s disease. “I think it’s a very well-done study,” says Keith Vossel, a translational neuroscientist at the University of California, San Francisco (UCSF), who was not involved with the work. In the rodent version of the so-called Morris Maze Test, researchers fill a large cylindrical container with water and place a platform just above the waterline. A scientist then places a rat into the tank, and the rodent must swim to the platform to avoid drowning. The experimenter then raises the water level just above the height of the platform and adds a compound to the water to make it opaque. The trial is repeated, but now the rat must find the platform without seeing it, using only its memory of where the safe zone exists relative to the tank’s walls and the surrounding environment. In subsequent trials, researchers place the rat at different starting points along the tank’s edge, but the platform stays put. In essence, the task requires the rat to move to a specific but invisible location within a circular arena from different starting points. © 2016 American Association for the Advancement of Science.
Link ID: 21803 - Posted: 01.20.2016
It seems like the ultimate insult, but getting people with brain injuries to do maths may lead to better diagnoses. A trial of the approach has found two people in an apparent vegetative state that may be conscious but “locked-in”. People who are in a vegetative state are awake but have lost all cognitive function. Occasionally, people diagnosed as being in this state are actually minimally conscious with fleeting periods of awareness, or even locked-in. This occurs when they are totally aware but unable to move any part of their body. It can be very difficult to distinguish between each state, which is why a team of researchers in China have devised a brain-computer interface that tests whether people with brain injuries can perform mental arithmetic – a clear sign of conscious awareness. The team, led by Yuanqing Li at South China University of Technology and Jiahui Pan at the South China Normal University in Guangzhou showed 11 people with various diagnoses a maths problem on a screen. This was followed by two possible answers flickering at frequencies designed to evoke different patterns of brain activity. Frames around each number also flashed several times. The participants were asked to focus on the correct answer and count the number of times its frame flashed. The brain patterns from the flickering answers together with the detection of another kind of brain signal that occurs when someone counts, enabled a computer to tell which answer, if any, the person was focusing on. © Copyright Reed Business Information Ltd.
Link ID: 21801 - Posted: 01.19.2016
Patricia Neighmond When Cathy Fields was in her late 50s, she noticed she was having trouble following conversations with friends. "I could sense something was wrong with me," she says. "I couldn't focus. I could not follow." Fields was worried she had suffered a stroke or was showing signs of early dementia. Instead she found out she had attention deficit hyperactivity disorder or ADHD. Fields is now 66 years old and lives in Ponte Vedra Beach, Fla. She's a former secretary and mother of two grown children. Fields was diagnosed with ADHD about eight years ago. Her doctor ruled out any physical problems and suggested she see a psychiatrist. She went to Dr. David Goodman at Johns Hopkins School of Medicine, who by chance specializes in ADHD. Goodman asked Fields a number of questions about focus, attention and completing tasks. He asked her about her childhood and how she did in school. Since ADHD begins in childhood, it's important for mental health professionals to understand these childhood experiences in order to make an accurate diagnosis of ADHD in adulthood. Online screening tests are available, too, so you can try it yourself. Goodman decided that Fields most definitely had ADHD. She's not alone. Goodman says he's seeing more and more adults over the age of 50 newly diagnosed with ADHD. © 2016 npr
Link ID: 21795 - Posted: 01.18.2016
By Melinda Beck Here’s a sobering thought for the holidays: Chronic heavy drinking can cause insidious damage to the brain, even in people who never seem intoxicated or obviously addicted. Experts say alcohol-related brain damage is underdiagnosed and often confused with Alzheimer’s disease, other forms of dementia or just getting older. Now, brain imaging is revealing how long-term alcohol abuse can change the structure of the brain, shrinking gray-matter cells in areas that govern learning, memory, decision-making and social behavior, as well as damaging white-matter fibers that connect one part of the brain with others. “As we get older, we all lose a little gray-matter volume and white-matter integrity, but in alcoholics, those areas break down more quickly. It looks like accelerated aging,” says Edith Sullivan, a professor of psychiatry and behavioral science at Stanford University, who has studied alcohol’s effects for years. Long-term alcohol abuse also changes how the brain regulates emotion and anxiety and disrupts sleep systems, creating wide-ranging effects on the body. Increasingly, clinicians are diagnosing “alcohol-induced neurocognitive disorder” and “alcohol-related dementia.” How much is too much and over what period of time? ©2016 Dow Jones & Company, Inc
Keyword: Drug Abuse
Link ID: 21794 - Posted: 01.18.2016
By DONALD G. McNEIL Jr. Federal health officials on Friday advised pregnant women to postpone traveling to 13 Latin American or Caribbean countries and Puerto Rico where mosquitoes are spreading the Zika virus, which has been linked to brain damage in babies. Women considering becoming pregnant were advised to consult doctors before traveling to countries with Zika cases, and all travelers were urged to avoid mosquito bites, as were residents of Puerto Rico and the United States Virgin Islands. “We believe this is a fairly serious problem,” said Dr. Lyle R. Petersen, chief of vector-borne diseases for the Centers for Disease Control and Prevention. “This virus is spreading throughout the Americas. We didn’t feel we could wait.” The C.D.C. advisory applies to 14 Western Hemisphere countries and territories: Brazil, Colombia, El Salvador, French Guiana, Guatemala, Haiti, Honduras, Martinique, Mexico, Panama, Paraguay, Suriname, Venezuela, and the Commonwealth of Puerto Rico. It applies to the entire countries “unless there is specific evidence the virus is not occurring somewhere,” Dr. Petersen said. This appears to be the first time the Centers for Disease Control and Prevention has advised pregnant women to avoid a specific region. The warning is expected to affect the travel industry and could affect the Summer Olympics, set for Brazil in August. Officials at Brazil’s Health Ministry were not available for comment Friday night. Hours earlier, Philip Wilkinson, a spokesman for the Rio 2016 organizing committee, said that Olympic venues “will be inspected on daily basis during the Rio 2016 Games to ensure there are no puddles of stagnant water and therefore minimize the risk of coming into contact with mosquitos.” Dr. Petersen said he did not want to speculate about how his agency’s warning might affect the Olympics. “This is a dynamic situation,” he said. “We’re going to wait and see how this all plays out. Viruses can spread in a population for some periods of time.” © 2016 The New York Times Company
Keyword: Development of the Brain
Link ID: 21792 - Posted: 01.16.2016
by Bethany Brookshire The high fiber refrain never seems to stop. We all know that we’re supposed to eat more fiber and focus on whole grains, fresh fruits and vegetables. But when forced to choose between chewy, crumbly, flavorless oat bran and delicious white buttered toast for breakfast, it’s easy to tune out. But that fiber isn’t for you. It fuels and sustains your gut microbes — and those in your kids, and grandkids and great-grandkids, too, a study in mice finds. The results suggest that when we pass our genes on to our children, we also pass on a gut ecosystem that reflects our previous dietary choices. (No pressure.) The Food and Drug Administration recommends that Americans eat about 25 grams of dietary fiber per day. But most people don’t hit that mark. “The average American gets 10 to 15 grams of dietary fiber,” says Erica Sonnenburg, a microbiologist at Stanford University. If that doesn’t make you feel ashamed, compare your diet to the Hadza, hunter-gatherers who live in Tanzania. “The tubers they’re eating are so fibrous [that people] chew for a while and spit it out,” Sonnenburg says. It’s hard to calculate exactly how much fiber the Hadza get from the tubers, but Sonnenburg says that some some speculate it’s between 100 and 150 grams per day at certain times of year. That high level of fiber is reflected in their guts. “What all the studies have found is that these populations who are living a more traditional lifestyle are the best approximation for our ancient microbiota. They all harbor microbiota that’s much more diverse.” © Society for Science & the Public 2000 - 2016. A
Link ID: 21791 - Posted: 01.16.2016