Chapter 16. None
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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
Angus Chen A new method of delivering medication for opioid addicts gained approval from a Food and Drug Administration advisory panel this week. It's a matchstick-like insert designed to slip under the skin and release a drug over a period of months. Some physicians say the implant will be a useful addition to the currently short lineup of medication-assisted treatment options. The rod is called Probuphine, developed by the companies Braeburn Pharmaceuticals and Titan Pharmaceuticals. It contains a medication called buprenorphine which the FDA approved for opioid addiction in 2002 and is currently widely in use. The FDA typically follows the advice of its advisory panels on approvals. This molecule binds to opioid receptors in the body, but doesn't hit them as hard as something like heroin or morphine would. So it can reduce cravings without giving a full high. It's often taken in combination with a medication called naloxone, which negates the effect of any additional opiates and acts as an antidote for overdoses. Right now, patients must hold a tablet or a film under their tongue or in their cheek until it dissolves every day. This gives a long-lasting implant a few advantages over oral daily doses. Probuphine lasts up to six months. So unless patients want to dig underneath their skin to tear the thing out, there's no deviating from the treatment. "With the Suboxone [a daily combination of buprenorphine and naloxone], you can go on these drug holidays," says Patrick Kennedy, a former congressman and former opiate addict who urged the panel to approve Probuphine. "If I knew I had access to another drug, OxyContin, I would just stop taking the Suboxone and — you know." © 2016 npr
Keyword: Drug Abuse
Link ID: 21790 - Posted: 01.16.2016
By Dina Fine Maron We may be able to keep our gut in check after all. That’s the tantalizing finding from a new study published today that reveals a way that mice—and potentially humans—can control the makeup and behavior of their gut microbiome. Such a prospect upends the popular notion that the complex ecosystem of germs residing in our guts essentially acts as our puppet master, altering brain biochemistry even as it tends to our immune system, wards off infection and helps us break down our supersized burger and fries. In a series of elaborate experiments researchers from Harvard Medical School and Brigham and Women’s Hospital discovered that mouse poop is chock full of tiny, noncoding RNAs called microRNAs from their gastrointestinal (GI) tracts and that these biomolecules appear to shape and regulate the microbiome. “We’ve known about how microbes can influence your health for a few years now and in a way we’ve always suspected it’s a two-way process, but never really pinned it down that well,” says Tim Spector, a professor of genetic epidemiology at King’s College London, not involved with the new study. “This [new work] explains quite nicely the two-way interaction between microbes and us, and it shows the relationship going the other way—which is fascinating,” says Spector, author of The Diet Myth: Why the Secret to Health and Weight Loss Is Already in Your Gut. What’s more, human feces share 17 types of microRNAs with the mice, which may portend similar mechanisms in humans, the researchers found. It could also potentially open new treatment approaches involving microRNA transplantations. “Obviously that raises the immediate question: ‘Where do the microRNAs come from and why are they there?,’” says senior author Howard Weiner, a neurologist at both Harvard and Brigham. The work was published in the journal Cell Host & Microbe. © 2016 Scientific American
Link ID: 21789 - Posted: 01.14.2016
By Anahad O'Connor For much of his life, Dr. Vincent Pedre, an internist in New York City, suffered from digestive problems that left him feeling weak and sick to his stomach. As an adult he learned he had irritable bowel syndrome, or I.B.S., a chronic gut disorder that affects up to 10 percent of Americans. Through the process of elimination, Dr. Pedre discovered that his diet was the source of many of his problems. Cutting out dairy and gluten reversed many of his symptoms. Replacing processed foods with organic meats, fresh vegetables and fermented foods gave him more energy and settled his sensitive stomach. Dr. Pedre, a clinical instructor in medicine at the Mount Sinai School of Medicine, began to encourage many of his patients who were struggling with digestive disorders to do the same, helping them to identify food allergens and food sensitivities that could act as triggers. He also urged his patients to try yoga and meditation to alleviate chronic stress, which can worsen digestive problems. Dr. Pedre now has a medical practice specializing in gastrointestinal disorders and is the author of a new book called “Happy Gut.” In the book, Dr. Pedre argues that chronic health problems can in some cases be traced to a dysfunctional digestive system, which can be quelled through a variety of lifestyle behaviors that nurture the microbiota, the internal garden of microbes that resides in the gut. Recently, we caught up with Dr. Pedre to talk about what makes a “happy gut,” how you can avoid some common triggers of digestive problems, and why fermented foods like kombucha and kimchi should be part of your diet. Here are edited excerpts from our conversation. © 2016 The New York Times Company
Link ID: 21788 - Posted: 01.14.2016
By Katherine Harmon Here’s another reason to eat your vegetables. Trillions of microbes in the human large intestine—known as the microbiome—depend on dietary fiber to thrive and give us energy. As fiber intake declines, so, too, does the range of bacteria that can survive in the gut. Now, a new study of multiple generations of mice fed a low-fiber diet indicates that this diversity plummets further with each generation, a hint of what might be happening in the human gut as we continue eating a contemporary diet of refined foods. The work might also help explain rises in many Western diseases, such as inflammatory bowel disease and obesity. "This is a seminal study," says microbial ecologist Jens Walter, of the University of Alberta in Canada. "The magnitude by which the low-[fiber] diet depletes the microbiome in the mouse experiments is startling." For much of human history in hunter-gatherer and early agrarian times, daily fiber intake was likely at least three or four times the officially recommended amounts today (something like 100 grams versus 25 grams)—and several times greater than average U.S. consumption now (about 15 grams). The trend has led many researchers, including microbiologist Erica Sonnenburg of Stanford University in Palo Alto, California, to suspect that the well-documented low diversity of gut microbes among people in developed countries—some 30% less diverse than in modern hunter-gatherers—is, in part, a product of drastically reduced fiber intake. © 2016 American Association for the Advancement of Science. A
Link ID: 21787 - Posted: 01.14.2016
David Cox In the spring of 1930, Danish artist Einar Wegener arrived in Berlin for a consultation that he hoped would both save and change his life. Wegener had spent the previous twenty years dressing as a woman, Lili Elbe. In public, his wife, painter Gerda Gottlieb, introduced Elbe as Wegener’s sister . But by 1930 he could not bear his double life any longer. He resolved to commit suicide, even naming a date – May 1. Instead, Wegener made a different choice, electing to undergo a series of pioneering gender reassignment operations, transitioning into Lili Ilse Elvenes, better known as Lili Elbe. Elbe’s extraordinary story remains controversial; indeed, the film The Danish Girl, starring Eddie Redmayne and based on Elbe’s life was this week banned from Qatari cinemas after protests about its “depravity”. Elbe’s revolutionary transition would not have been possible without the contribution of the sexologist Magnus Hirschfeld, a man who had become both renowned and notorious across Europe for his groundbreaking research into human gender and sexuality. While Elbe’s posthumous 1933 biography, “Man into Woman: The First Sex Change”, made her story internationally famous, Hirschfeld is a less well-known figure today. As both a Jew and gay activist, much of his legacy was burnt to ashes when his Institute for Sexual Research was targeted by a Nazi attack in 1933. But through colleagues and pupils, his work has gone on to transform the way we view sexual minorities and has helped make gender reassignment surgery the widely accepted procedure it is today. © 2016 Guardian News and Media Limited o
Keyword: Sexual Behavior
Link ID: 21786 - Posted: 01.14.2016
By SABRINA TAVERNISE SILVER SPRING, Md. — A panel of medical experts recommended Tuesday that the Food and Drug Administration approve a new way of treating opioid addicts, using a slender rod implanted into the arm that delivers medicine for months at a time. Some doctors say it could help ease the national epidemic of drug overdoses. The rod is about the size of a small matchstick and delivers daily doses of buprenorphine — one of the most common medical treatments for opioid addicts — for six-month periods. In controlled doses, buprenorphine can help the body withdraw from opioid addiction, but can also itself be addictive. That risk is increased by the fact that the medicine can be taken only by mouth, requiring patients, often ill from addiction, to manage their daily dosages. The advisory panel voted 12 to 5 to recommend approval. The panel concluded that flaws in the evidence the company presented, including missing data in a clinical study, were not fatal, and that the product was roughly as effective as the oral form of the drug. They agreed it would be a useful tool for doctors in the face of a major public health epidemic and could help stem the flow of illicit use of buprenorphine. “I think this will save some folks’ lives,” said Dr. David Pickar, adjunct professor of psychiatry at Johns Hopkins Medical School, who voted to recommend approval. “From a safety point of view I think we’re in good shape.” Dr. Thomas Grieger, a staff psychiatrist at the Maryland Department of Health and Mental Hygiene, said: “There is not evidence of significant risk using this agent, but there is evidence of significant benefit.” © 2016 The New York Times Company
Keyword: Drug Abuse
Link ID: 21783 - Posted: 01.13.2016
By Gretchen Reynolds. To handle stress and adversity more effectively, we should probably pay closer attention to what is happening inside our bodies, according to a fascinating new brain study of resilience and why some people seem to have more of it than others. We live in difficult times, as readers of this newspaper know well. Worries about the state of our world, our safety, our finances, health and more can lead to a variety of physiological and psychological responses. “When faced with stress, whether it’s giving a talk in front of a hundred people or feeling pressured to get a second gold medal at the Olympics, we experience changes in our body,” said Lori Haase, a clinical professor of psychiatry at the University of California in San Diego and lead author of the new study. Our heart rates rise, breathing grows shallow, and blood levels of adrenaline and other stress chemicals soar. While this stress response can have desirable results — “I need anxiety to motivate myself to write a grant,” Dr. Haase said — it can easily can get out of hand. Remaining in a state of heightened arousal undermines physical and mental performance, she explained. So while our bodies should respond to dangers and worries, our stress reactions also should dissipate as soon as possible afterward. This is where resilience comes in. In scientific terms, resilience is the ability to rapidly return to normal, both physically and emotionally, after a stressful event. Scientists and therapists long have known that some people are more resilient than others but had not known precisely why. © 2016 The New York Times Company
Link ID: 21780 - Posted: 01.13.2016
By Virginia Morell Dog owners often say they “know” that their dog understands what they’re feeling. Now, scientists have the evidence to back this up. Researchers tested 17 adult dogs of various breeds to see whether they could recognize emotional expressions in the faces and voices of humans and other dogs—an ability that’s considered a higher cognitive talent because two different senses are involved. Each dog took part in two test sessions with 10 trials. One by one, they stood facing two screens on which the researchers projected photos of unfamiliar but happy/playful human or dog faces versus the same faces with angry/aggressive expressions (as in the photo above). At the same time, the scientists played a single vocalization—either a dog bark, or an unfamiliar human speaking in Portuguese, a language none of the dogs had previously heard, or a neutral sound. The dogs looked much longer at a face (dog or human) when the expression matched the tone of the voice, a measure that’s also been used to assess various cognitive abilities of other mammals, the scientists report online today in Biology Letters. The dogs were best at this when looking at a fellow dog, which supports another study showing that dogs preferred looking at images of other dogs rather than those of humans. It’s the first time that a species, other than humans, has been shown to be capable of interpreting the vocal and facial expressions of an entirely different species of animal—a talent that surely helps Fido survive in its ecological niche: the jungle of the human home. © 2016 American Association for the Advancement of Science.
Link ID: 21779 - Posted: 01.13.2016
Answered by Anne Masten, You raise one of the most intriguing questions in modern resilience science: Can adversity be good for development? The answer appears to be yes, depending on the timing and nature of the stresses. But it is important to note that it is a person's adaptive responses to life's challenges that are beneficial, not the exposure to adversity itself. Beneficial responses have been called steeling effects, stress inoculation and post-traumatic growth. Extreme deprivation or stress can clearly cause lasting life consequences. Yet many individuals endure, recover and thrive in the aftermath of devastating events. A few, such as Malala Yousafzai, Stephen Hawking or Oprah Winfrey, even become famous. What distinguishes them? An individual's resilience can be viewed as the capacity to adapt to adversity at a given point. Resilience is not innate, nor is it fixed. It can fluctuate throughout a person's lifetime and is influenced by a complex set of adaptive processes. Many of these protective systems improve with experience or require challenges to reach their full potential. On a biological and environmental level, our capabilities to fight off infections and respond to stress are both shaped by experience. For instance, we vaccinate our children to promote immunity to dangerous pathogens. Similarly, exposure to manageable levels of psychological stress can improve future adaptation abilities. It is important to remember, however, that too much adversity can deplete the resources any child or adult needs to muster resilience. There is psychological and neurobiological evidence that prolonged or overwhelming stress can wear down our body and mind. © 2016 Scientific American
Link ID: 21775 - Posted: 01.12.2016
When Jack O'Connor was 19, he was so desperate to beat his addictions to alcohol and opioids that he took a really rash step. He joined the Marines. "This will fix me," O'Connor thought as he went to boot camp. "It better fix me or I'm screwed." After 13 weeks of sobriety and exercise and discipline, O'Connor completed basic training, but he started using again immediately. "Same thing," he says. "Percocet, like, off the street. Pills." Percocet is the brand name for acetaminophen and oxycodone. Oxycodone is a powerful opioid. It's one of the most commonly prescribed painkillers, and is a key factor in one of the country's most pressing public health problems — an opioid addiction epidemic. It is a crisis that started, in part, from the over-prescription of painkillers, like Percocet, and then shifted to heroin, as people addicted to prescription drugs looked for a cheaper high. O'Connor is one of an estimated 2.5 million Americans addicted to opioids and heroin, according to the National Institute on Drug Abuse. Over three years, he detoxed from prescription painkillers — and heroin — more than 20 times. Each time, he started using again. So why is it so hard for opioid addicts to quit? You can boil it down to two crucial bits of science: the powerful nature of opioids and the neuroscience behind how addiction hijacks the brain. "The first recording of opioid use was 5,000 years ago," says Dr. Seddon Savage, an addiction and pain specialist at Dartmouth College. It was "a picture of the opium poppy and the words 'the joy plant.' "
Keyword: Drug Abuse
Link ID: 21773 - Posted: 01.11.2016