Most Recent Links
Follow us on Facebook and Twitter, or subscribe to our mailing list, to receive news updates. Learn more.
By DENISE GRADY Faced with mounting evidence that general anesthesia may impair brain development in babies and young children, experts said Wednesday that more research is greatly needed and that when planning surgery for a child, parents and doctors should consider how urgently it is required, particularly in children younger than 3 years. In the United States each year, about a million children younger than 4 have surgery with general anesthesia, according to the Food and Drug Administration. So far, the threat is only a potential one; there is no proof that children have been harmed. The concern is based on two types of research. Experiments in young monkeys and other animals have shown that commonly used anesthetics and sedatives can kill brain cells, diminish learning and memory and cause behavior problems. And studies in children have found an association between learning problems and multiple exposures to anesthesia early in life — though not single exposures. But monkeys are not humans, and association does not prove cause and effect. Research now underway is expected to be more definitive, but results will not be available for several years. Anesthesiologists and surgeons are struggling with how — and sometimes whether — to explain a theoretical hazard to parents who are already worried about the real risks of their child’s medical problem and the surgery needed to correct it. If there is a problem with anesthesia, in many cases it may be unavoidable because there are no substitute drugs. The last thing doctors want to do is frighten parents for no reason or prompt them to delay or cancel an operation that their child needs. “On the one hand, we don’t want to overstate the risk, because we don’t know what the risk is, if there is a risk,” said Dr. Randall P. Flick, a pediatric anesthesiologist and director of Mayo Clinic Children’s Center in Rochester, Minn., who has conducted some of the studies in children suggesting a link to learning problems. “On the other hand, we want to make people aware of the risk because we feel we have a duty to do so.” © 2015 The New York Times Compan
People with attention deficit hyperactivity disorder are about twice as likely to die prematurely as those without the disorder, say researchers. Researchers followed 1.92 million Danes, including 32,000 with ADHD, from birth through to 2013. "In this nationwide prospective cohort study with up to 32-year followup, children, adolescents and adults with ADHD had decreased life expectancy and more than double the risk of death compared with people without ADHD," Soren Dalsgaard, from Aarhus University in Denmark, and his co-authors concluded in Wednesday's online issue of Lancet. Actress Kirstie Alley holds a picture of Raymond Perone while testifying in favour of a bill designed to curb the over-prescribing of psychotropic drugs. Danish researchers studying ADHD say medications can reduce symptoms of inattention and impulsivity. (Phil Coale/Associated Press) "People diagnosed with ADHD in adulthood had a greater risk of death than did those diagnosed in childhood and adolescence. This finding could be caused by persistent ADHD being a more severe form of the disorder." Of the 107 individuals with ADHD who died, information on cause of death was available for 79. Of those, 25 died from natural causes and 54 from unnatural causes, including 42 from accidents. Being diagnosed with ADHD along with oppositional defiant disorder, conduct disorder and substance use disorder also increased the risk of death, the researchers found. Mortality risk was also higher for females than males, which led Dalsgaard to stress the need for early diagnosis, especially in girls and women, and to treat co-existing disorders. Although talk of premature death will worry parents and patients, they can seek solace in knowing the absolute risk of premature death at an individual level is low and can be greatly reduced with treatment, Stephen Faraone, a professor of psychiatry and director of child and adolescent psychiatry research at SUNY Upstate Medical University in New York, said in a journal commentary published with the study. ©2015 CBC/Radio-Canada.
|By Matthew Hutson We like to think of our moral judgments as consistent, but they can be as capricious as moods. Research reveals that such judgments are swayed by incidental emotions and perceptions—for instance, people become more moralistic when they feel dirty or sense contamination, such as in the presence of moldy food. Now a series of studies shows that hippies, the obese and “trailer trash” suffer prejudicial treatment because they tend to elicit disgust. Researchers asked volunteers to read short paragraphs about people committing what many consider to be impure acts, such as watching pornography, swearing or being messy. Some of the paragraphs described the individuals as being a hippie, obese or trailer trash—and the volunteers judged these fictional sinners more harshly, according to the paper in the Journal of Experimental Psychology: General. Questionnaires revealed that feelings of disgust toward these groups were driving the volunteers' assessments. A series of follow-up studies solidified the link, finding that these groups also garnered greater praise for purity-related virtues, such as keeping a neat cubicle. If the transgression in question did not involve purity, such as not tipping a waiter, the difference in judgment disappeared. “The assumption people have is that we draw on values that are universal and important,” says social psychologist E. J. Masicampo of Wake Forest University, who led the study, “but something like mentioning that a person is overweight can really push that judgment around. It's triggering these gut-level emotions.” The researchers also looked for real-world effects. © 2015 Scientific American
By Christian Jarrett Imagine a politician from your party is in trouble for alleged misdemeanors. He’s been assessed by an expert who says he likely has early-stage Alzheimer’s. If this diagnosis is correct, your politician will have to resign, and he’ll be replaced by a candidate from an opposing party. This was the scenario presented to participants in a new study by Geoffrey Munro and Cynthia Munro. A vital twist was that half of the 106 student participants read a version of the story in which the dementia expert based his diagnosis on detailed cognitive tests; the other half read a version in which he used a structural MRI brain scan. All other story details were matched, such as the expert’s years of experience in the field, and the detail provided for the different techniques he used. Overall, the students found the MRI evidence more convincing than the cognitive tests. For example, 69.8 percent of those given the MRI scenario said the evidence the politician had Alzheimer’s was strong and convincing, whereas only 39.6 percent of students given the cognitive tests scenario said the same. MRI data was also seen to be more objective, valid and reliable. Focusing on just those students in both conditions who showed skepticism, over 15 percent who read the cognitive tests scenario mentioned the unreliability of the evidence; none of the students given the MRI scenario cited this reason. In reality, a diagnosis of probable Alzheimer’s will always be made with cognitive tests, with brain scans used to rule out other explanations for any observed test impairments. The researchers said their results are indicative of naive faith in the trustworthiness of brain imaging data. “When one contrasts the very detailed manuals accompanying cognitive tests to the absences of formalized operational criteria to guide the clinical interpretation of structural brain MRI in diagnosing disease, the perception that brain MRI is somehow immune to problems of reliability becomes even more perplexing,” they said. WIRED.com © 2015 Condé Nast.
By Francis Shen and Dena Gromet Neuroscience is appearing everywhere. And the legal system is taking notice. The past few years have seen the emergence of “neurolaw.” A spread in the NYT Magazine, a best-selling NYT book, a primetime PBS documentary, the first Law and Neuroscience casebook, and a multimillion-dollar investment from the MacArthur Foundation to fund a Research Network on Law and Neuroscience have all fueled interest in how neuroscience might revolutionize the law. The potential implications of neurolaw are broad. For example, future developments in brain science might allow: criminal law to better identify recidivists; tort law to better differentiate between those in real pain and those who are faking; insurance law to more accurately and adequately compensate those with mental illness; and end-of-life law to more ethically treat patients who might be able to communicate only through their thoughts. Increasingly courts, including the U.S. Supreme Court, and legislatures are citing brain evidence. But despite the media coverage, and much enthusiasm from science and legal elites, our new research shows that Americans know very little about neurolaw, and that Republicans and independents may diverge from Democrats in their support for neuroscience based legal reforms. In our study, we conducted an experiment within a national survey of Americans (more details about the survey are in our article). Everyone in the survey was told that, “Recently developed neuroscientific techniques allow researchers to see inside the human brain as never before.”
Julie Beck When Paul Ekman was a grad student in the 1950s, psychologists were mostly ignoring emotions. Most psychology research at the time was focused on behaviorism—classical conditioning and the like. Silvan Tomkins was the one other person Ekman knew of who was studying emotions, and he’d done a little work on facial expressions that Ekman saw as extremely promising. “To me it was obvious,” Ekman says. “There’s gold in those hills; I have to find a way to mine it.” For his first cross-cultural studies in the 1960s, he traveled around the U.S., Chile, Argentina, and Brazil. In each location, he showed people photos of different facial expressions and asked them to match the images with six different emotions: happiness, sadness, anger, surprise, fear, and disgust. “There was very high agreement,” Ekman says. People tended to match smiling faces with “happiness,” furrow-browed, tight-lipped faces with “anger,” and so on. But these responses could have been influenced by culture. The best way to test whether emotions were truly universal, he thought, would be to repeat his experiment in a totally remote society that hadn’t been exposed to Western media. So he planned a trip to Papua New Guinea, his confidence bolstered by films he’d seen of the island’s isolated cultures: “I never saw an expression I wasn’t familiar with in our culture,” he says. Once there, he showed locals the same photos he’d shown his other research subjects. He gave them a choice between three photos and asked them to pick images that matched various stories (such as “this man’s child has just died”). Adult participants chose the expected emotion between 28 and 100 percent of the time, depending which photos they were choosing among. (The 28 percent was a bit of an outlier: That was when people had to choose between fear, surprise, and sadness. The next lowest rate was 48 percent.) © 2014 by The Atlantic Monthly Group.
Link ID: 20619 - Posted: 02.26.2015
// by Jennifer Viegas It’s long been suspected that males of many species, including humans, can sniff out whether a female is pregnant, and now new research suggests that some — if not all — female primates release a natural “pregnancy perfume” that males can probably detect. What’s more, such scents appear to broadcast whether the mom-to-be is carrying a boy or a girl. The study, published in the journal Biology Letters, focused on lemurs as a model for primates. It presents the first direct evidence in any animal species that a pregnant mother’s scent differs depending on the sex of her baby. The scent signatures “may help guide social interactions, potentially promoting mother–infant recognition, reducing intragroup conflict” or sort out paternity, wrote authors Jeremy Crawford and Christine Drea. The latter presents a loaded scenario, as it could be that males can sense — even before the birth — whether they fathered the baby. The researchers additionally suspect that odors advertising fetal sex may help dads and moms prepare for what’s to come. Crawford, from the University of California, Berkeley, and Drea, from Duke University, used cotton swabs to collect scent secretions from the genital regions of 12 female ringtailed lemurs at the Duke Lemur Center in Durham, N.C., before and during pregnancy. The scientists next used chemical analysis to identify the hundreds of ingredients that make up each female’s scent change during pregnancy. A surprising finding from this is that expectant lemur moms give off simpler scents that contain fewer odor compounds compared with their pre-pregnancy bouquet. The change is more pronounced when the moms are carrying boys, Drea said. © 2015 Discovery Communications, LLC.
by Hal Hodson Video: Bionic arm trumps flesh after elective amputation Bionic hands are go. Three men with serious nerve damage had their hands amputated and replaced by prosthetic ones that they can control with their minds. The procedure, dubbed "bionic reconstruction", was carried out by Oskar Aszmann at the Medical University of Vienna, Austria. The men had all suffered accidents which damaged the brachial plexus – the bundle of nerve fibres that runs from the spine to the hand. Despite attempted repairs to those nerves, the arm and hand remained paralysed. "But still there are some nerve fibres present," says Aszmann. "The injury is so massive that there are only a few. This is just not enough to make the hand alive. They will never drive a hand, but they might drive a prosthetic hand." This approach works because the prosthetic hands come with their own power source. Aszmann's patients plug their hands in to charge every night. Relying on electricity from the grid to power the hand means all the muscles and nerves need do is send the right signals to a prosthetic. Before the operation, Aszmann's patients had to prepare their bodies and brains. First he transplanted leg muscle into their arms to boost the signal from the remaining nerve fibres. Three months later, after the nerves had grown into the new muscle, the men started training their brains. © Copyright Reed Business Information Ltd.
Link ID: 20617 - Posted: 02.26.2015
By Jocelyn Kaiser The number of animals used by the top federally funded U.S. biomedical research institutions has risen 73% over 15 years, a “dramatic increase” driven mostly by more mice, concludes an animal rights group. They say researchers are not doing enough to reduce their use of mice, which are exempt from some federal animal protection laws. The National Institutes of Health (NIH), which collected the data, says the analysis by People for the Ethical Treatment of Animals (PETA) is “inappropriate.” The analysis was published online today in the Journal of Medical Ethics. Although the Animal Welfare Act requires that the U.S. Department of Agriculture track research labs’ use of cats, dogs, and nonhuman primates, smaller vertebrates—including mice, rats, fish, and birds bred for research—are exempt. To get a sense of the trends, PETA filed Freedom of Information Act requests for data from inventories that NIH-funded institutions must submit to NIH every 4 years to receive an “assurance” allowing them to do animal research. Looking at the 25 top NIH-funded institutions, PETA found these institutions housed a daily average of about 74,600 animals between 1997 and 2003; that leaped to an average of about 128,900 a day by 2008 to 2012, a 73% increase. (Because institutions don’t report at the same time, PETA combined figures over three time periods.) © 2015 American Association for the Advancement of Science
Keyword: Animal Rights
Link ID: 20616 - Posted: 02.26.2015
Sara Reardon Annie is lying down when she answers the phone; she is trying to recover from a rare trip out of the house. Moving around for an extended period leaves the 56-year-old exhausted and with excruciating pain shooting up her back to her shoulders. “It's really awful,” she says. “You never get comfortable.” In 2011, Annie, whose name has been changed at the request of her lawyer, slipped and fell on a wet floor in a restaurant, injuring her back and head. The pain has never eased, and forced her to leave her job in retail. Annie sued the restaurant, which has denied liability, for several hundred thousand dollars to cover medical bills and lost income. To bolster her case that she is in pain and not just malingering, Annie's lawyer suggested that she enlist the services of Millennium Magnetic Technologies (MMT), a Connecticut-based neuroimaging company that has a centre in Birmingham, Alabama, where Annie lives. MMT says that it can detect pain's signature using functional magnetic resonance imaging (fMRI), which measures and maps blood flow in the brain as a proxy for neural activity. The scan is not cheap — about US$4,500 — but Steven Levy, MMT's chief executive, says that it is a worthwhile investment: the company has had ten or so customers since it began offering the service in 2013, and all have settled out of court, he says. If the scans are admitted to Annie's trial, which is expected to take place early this year, it could establish a legal precedent in Alabama. Most personal-injury cases settle out of court, so it is impossible to document how often brain scans for pain are being used in civil law. But the practice seems to be getting more common, at least in the United States, where health care is not covered by the government and personal-injury cases are frequent. Several companies have cropped up, and at least one university has offered the service. © 2015 Nature Publishing Group
By KATIE THOMAS The retired tennis player Monica Seles spent this month making the rounds of television talk shows, appearing on everything from “Good Morning America” to “The Dr. Oz Show” to share her personal struggle with binge eating. “It took a while until I felt comfortable talking about it,” she said in a People magazine interview, explaining that she secretly devoured food for years while she was a professional athlete. “That’s one of the reasons I decided to do this campaign: to raise awareness that binge eating is a real medical condition.” But that is not the only reason. Ms. Seles is a paid spokeswoman for Shire, which late last month won approval to market its top-selling drug, Vyvanse, to treat binge-eating disorder, a condition that once existed in the shadow of better-known disorders like anorexia and bulimia but was officially recognized as its own disorder in 2013 by the American Psychiatric Association. As Shire introduces an ambitious campaign to promote Vyvanse but also to raise awareness about the disorder, some are saying the company is going too far to market a drug, a type of amphetamine, that is classified by the federal government as having a high potential for abuse. Shire’s track record is adding to the worry: The company helped put another once-stigmatized condition — attention deficit hyperactivity disorder — on the medical map and made billions of dollars from the sale of drugs, like Vyvanse and Adderall, to treat it. In recent years, federal officials have cited the company for inappropriately marketing Vyvanse and other A.D.H.D. drugs. In addition, some drug safety experts questioned why the Food and Drug Administration so swiftly approved the drug for binge eating — seeking little outside input — despite the fact that, for decades, amphetamines, which suppress the appetite, were widely abused as a treatment for obesity. © 2015 The New York Times Company
Keyword: Anorexia & Bulimia
Link ID: 20614 - Posted: 02.25.2015
Helen Shen Repeated head injuries in American football have been linked to a degenerative brain disorder later in life. Dave Duerson suspected that something was wrong with his brain. By 2011, 18 years after the former American football player had retired from the Phoenix Cardinals, he experienced frequent headaches, memory problems and an increasingly short temper. Before he killed himself, he asked that his brain be donated for study. Researchers who examined it found signs of chronic traumatic encephalopathy (CTE), a degenerative condition linked to repeated head injuries. At least 69 cases have been reported in the literature since 2000, many in former boxers and American football players (P. H. Montenigro et al. Alz. Res. Ther. 6, 68; 2014) — heightening public concern about concussions during contact sports. Yet much about CTE is unknown, from its frequency to its precise risk factors and even whether its pathology is unique. Researchers now hope to take a major step towards answering those questions. At Boston University in Massachusetts on 25–27 February, neuroscientists will convene to examine the characteristics of CTE in brain tissue from post-mortem examinations. They hope to agree on a set of diagnostic criteria for the disease, and to assess whether it is distinct from other brain disorders, such as Alzheimer’s disease. The effort is sorely needed, says Walter Koroshetz, acting director of the US National Institute of Neurological Disorders and Stroke in Bethesda, Maryland, which is organizing the meeting. “The definition is the important piece that lets you do the rest of the research,” he says. And the stakes are high. CTE is associated with memory loss, irritability, depression and explosive anger, which are thought to appear and worsen years after repeated head trauma. © 2015 Nature Publishing Group
Keyword: Brain Injury/Concussion
Link ID: 20613 - Posted: 02.25.2015
By Michelle Roberts Health editor, BBC News online Scientists have proposed a new idea for detecting brain conditions including Alzheimer's - a skin test. Their work, which is at an early stage, found the same abnormal proteins that accumulate in the brain in such disorders can also be found in skin. Early diagnosis is key to preventing the loss of brain tissue in dementia, which can go undetected for years. But experts said even more advanced tests, including ones of spinal fluid, were still not ready for clinic. If they were, then doctors could treatment at the earliest stages, before irreversible brain damage or mental decline has taken place. Brain biomarker Investigators have been hunting for suitable biomarkers in the body - molecules in blood or exhaled breath, for example, that can be measured to accurately and reliably signal if a disease or disorder is present. Dr Ildefonso Rodriguez-Leyva and colleagues from the University of San Luis Potosi, Mexico, believe skin is a good candidate for uncovering hidden brain disorders. Skin has the same origin as brain tissue in the developing embryo and might, therefore, be a good window to what's going on in the mind in later life - at least at a molecular level - they reasoned. Post-mortem studies of people with Parkinson's also reveal that the same protein deposits which occur in the brain with this condition also accumulate in the skin. To test if the same was true in life as after death, the researchers recruited 65 volunteers - 12 who were healthy controls and the remaining 53 who had either Parkinson's disease, Alzheimer's or another type of dementia. They took a small skin biopsy from behind the ear of each volunteer to test in their laboratory for any telltale signs of disease. Specifically, they looked for the presence of two proteins - tau and alpha-synuclein. © 2015 BBC.
By Sandhya Sekar It’s stressful being a low-ranking hyena—so stressful that even their chromosomes feel it. Researchers have discovered that the challenges of African savanna hyena society shorten underdogs’ telomeres, stretches of DNA that bookend chromosomes and protect them from wear and tear during cell replication. The stress may come from the top hyenas getting the best meat, whereas lower ranking individuals have to travel long distances—sometimes to the edges of the group territory—to fend for themselves. With increased stress, higher amounts of stress hormones and cellular byproducts like oxygen ions and peroxides are produced, both of which have been shown to shorten telomeres in other species. When telomeres fall below a certain length, cells go into damage-control mode and kick off biochemical pathways that can result in cell death. The study, the team reports online today in Biology Letters, is the first to show that the stress of social hierarchy can shorten telomeres in a wild species. © 2015 American Association for the Advancement of Science.
Link ID: 20611 - Posted: 02.25.2015
by Penny Sarchet An injection and a dash of exercise could be the secret to keeping trim. These rainbow mice, imaged in infrared to reveal how much energy they are burning while on a treadmill, are revealing how a shot can boost a muscle's ability to burn calories. Red body parts show where lots of energy is being used. The mouse on the right has a red patch on its left hind leg, which corresponds to the spot where it received an injection of a substance developed by Denice Hodgson-Zingman from the University of Iowa and colleagues. The substance is a type of morpholino, a compound that can be designed to target specific genes, in this case to alter proteins responsible for storing energy. The disruption causes muscles to burn more energy even during mild exercise, such as a gentle trot on a treadmill. In contrast, the untreated mouse on the left, which is doing the same amount of exercise, is using less energy in the same spot, as illustrated by the colder green colour. The researchers hope the injection will help people who want to burn more calories do so through routine everyday activities, eliminating the need for intense exercise. Journal reference: Molecular Therapy, DOI: 10.1038/mt.2015.2141 © Copyright Reed Business Information Ltd.
Link ID: 20610 - Posted: 02.24.2015
By Barron H. Lerner, M.D. I can’t stand it when someone behind me at a movie chews popcorn with his or her mouth open. I mean, I really can’t stand it. I have misophonia, a condition with which certain sounds can drive someone into a burst of rage or disgust. Although only identified and named in the last 20 years, misophonia has been enthusiastically embraced, with websites, Facebook pages and conferences drawing small armies of frustrated visitors. As a primary care physician, I find that misophonia can present some special challenges: At times, my patients can be the source of annoying sounds. At other times, the condition can be a source of special bonding if I realize that a patient is a fellow sufferer. But some experts question whether misophonia really exists. By naming it, are we giving too much credence to a series of symptoms that are no big deal? Coined by the married researchers Margaret and Pawel Jastreboff of Emory University in 2002, misophonia (“hatred of sound”) is sometimes referred to as selective sound sensitivity syndrome. Like me, those with the disorder identify a series of specific sounds that bother them. A2013 study by Arjan Schröder and his colleagues at the University of Amsterdam identified the most common irritants as eating sounds, including lip smacking and swallowing; breathing sounds, such as nostril noises and sneezing; and hand sounds, such as typing and pen clicking. The range of responses to these noises is broad, from irritation to disgust to anger. Some sufferers even respond with verbal or physical aggression to those making the noises. One woman reported wanting to strangle her boyfriend in response to his chewing. © 2015 The New York Times Company
By Emily Underwood Infants born prematurely are more than twice as likely to have difficulty hearing and processing words than those carried to full-term, likely because brain regions that process sounds aren’t sufficiently developed at the time of delivery. Now, an unusual study with 40 preemies suggests that recreating a womblike environment with recordings of a mother's heartbeat and voice could potentially correct these deficits. "This is the kind of study where you think ‘Yes, I can believe these results,’ " because they fit well with what scientists know about fetal brain development, says cognitive scientist Karin Stromswold of Rutgers University, New Brunswick, in New Jersey. A fetus starts to hear at about 24 weeks of gestation, as neurons migrate to—and form connections in—the auditory cortex, a brain region that processes sound, Stromswold explains. Once the auditory cortex starts to function, a fetus normally hears mostly low-frequency sounds—its mother’s heartbeat, for example, and the melody and rhythm of her voice. Higher frequency tones made outside of the mother's body, such as consonants, are largely drowned out. Researchers believe that this introduction to the melody and rhythm of speech, prior to hearing individual words, may be a key part of early language acquisition that gets disrupted when a baby is born too soon. In addition to being bombarded with the bright lights, chemical smells, and shrill sounds of a hospital’s intensive care unit, preemies are largely deprived of the sensations they'd get in the womb, such as their mother's heartbeat and voice, says Amir Lahav, a neuroscientist at Harvard Medical School in Boston. Although mothers are sometimes allowed to hold premature newborns for short periods of time, the infants are often considered too fragile to leave their temperature- and humidity-controlled incubators, he says. Preemies often have their eyes covered to block out light, and previous studies have shown that reducing overall levels of high-frequency noise in a neonatal intensive care unit—by lowering the number of incubators in a unit, for example, or giving preemies earplugs—can improve premature babies' outcomes. Few studies have actively simulated a womblike environment, however, he says. © 2015 American Association for the Advancement of Science.
By Aleksandra Sagan, CBC News Photos of emaciated women proudly displaying their protruding hips and ribs, as well as thinspirational quotes "fat-shaming" those who dare to eat, continue to thrive on social media, despite the best attempts by sites like Instagram to temper the reach of the pro-eating disorder community. Some girls gain thousands of followers posting pictures of "thigh gaps" and "bikini bridges," as well as underweight celebrities and thinspirational quotes like model Kate Moss's mantra: "nothing tastes as good as skinny feels." "It just provides a lot of positivity for them, just in a very maladaptive way," says Edward Selby, of the more visual outlet that sites like Instagram provide. An assistant professor of clinical psychology at Rutgers University in New Jersey, Selby is the director of a lab there that studies what makes people more likely to develop anorexia (self-starvation), bulimia (binge-eating and purging) and other eating disorders. About one in 20 young women in Canada has an eating disorder, according to the Toronto-based National Initiative for Eating Disorders. And people suffering from these diseases often feel good after exercising, purging, swallowing a laxative or doing other things that contribute to their illness, Selby says. They get caught in a "cyclic feedback loop," with the positive emotions pushing them to engage more in these risky behaviours. Online pro-anorexia and bulimia communities simply add to that loop by celebrating a person's unhealthy achievements, he says. "Finally under 130! Woohoo!" writes one user with a photo of her feet on a scale. "Yay congrats," reads a response. Another girl posts a screen grab from an app claiming that she's been fasting for more than a day. It receives 32 likes and a "great job" among the comments. ©2015 CBC/Radio-Canada
Keyword: Anorexia & Bulimia
Link ID: 20607 - Posted: 02.24.2015
By JON PALFREMAN EUGENE, Ore. — FOUR years ago, I was told I had Parkinson’s disease, a condition that affects about one million Americans. The disease is relentlessly progressive; often starting with a tremor in one limb on one side of the body, it spreads. The patient’s muscles become more rigid, frequently leading to a stooped posture, and movements slow down and get smaller and less fluid. As the disease advances — usually over a number of years — the patient becomes more and more disabled, experiencing symptoms from constipation to sleep disorders to cognitive impairment. Can Parkinson’s be slowed, stopped or even reversed? Can the disease be prevented before it starts, like polio and smallpox? More than at any time in history, success seems possible. Having sequenced the human genome, biomedical researchers have now set their sights on the ultimate frontier — the human brain. The formidable puzzle is to figure out how a three-pound lump of mostly fatty matter enables us to perform a seemingly endless number of tasks, like walking, seeing, hearing, smelling, tasting, touching, thinking, loving, hating, speaking and writing ... and why those awesome abilities break down with neurological disease. Many scientists view Parkinson’s as a so-called pathfinder. If they can figure out what causes Parkinson’s, it may open the door to understanding a host of other neurodegenerative diseases — and to making sense of an organ of incredible complexity. In Parkinson’s, the circuitry in a tiny region of the brain called the basal ganglia becomes dysfunctional. Along with the cerebellum, the basal ganglia normally acts as a kind of adviser that helps people learn adaptive skills by classic conditioning — rewarding good results with dopamine bursts and punishing errors by withholding the chemical. Babies rely on the basal ganglia to learn how to deploy their muscles to reach, grab, babble and crawl, and later to accomplish many complex tasks without thinking. For example, when a tennis player practices a stroke over and over again, the basal ganglia circuitry both rewards and “learns” the correct sequence of activities to produce, say, a good backhand drive automatically. © 2015 The New York Times Company
Link ID: 20606 - Posted: 02.24.2015
By Sandra G. Boodman Catherine Cutter’s voice was her livelihood. A professor of food science at Penn State University, the microbiologist routinely lectured to large classes about food safety in the meat and poultry industries. But in 2008, after Cutter’s strong alto voice deteriorated into a raspy whisper, she feared her academic career might be over.How could she teach if her students could barely hear her? The classroom wasn’t the only area of Cutter’s life affected by her voicelessness. The mother of two teenagers, Cutter, now 52, recalls that she “couldn’t yell — or even talk” to her kids and would have to knock on a wall or countertop to get their attention. Social situations became increasingly difficult as well, and going to a restaurant was a chore. Using the drive-through at her bank or dry cleaner was out of the question because she couldn’t be heard. “I just retreated,” said Cutter, who sought assistance from nearly two dozen specialists for her baffling condition. The remedies doctors prescribed — when they worked at all — resulted in improvement that was temporary at best. For two years Cutter searched in vain for help. It arrived in the form of a neurosurgeon she consulted for a second opinion about potentially risky surgery to correct a different condition. He suggested a disorder that had never been mentioned, a diagnosis that proved to be correct — and correctable. Until then, “everyone had been looking in the wrong place,” Cutter said.
Keyword: Movement Disorders
Link ID: 20605 - Posted: 02.24.2015