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Scientists say they have identified the underlying reason why some people are prone to the winter blues, or seasonal affective disorder (SAD). People with Sad have an unhelpful way of controlling the "happy" brain signalling compound serotonin during winter months, brain scans reveal. As the nights draw in, production of a transporter protein ramps up in Sad, lowering available serotonin. The work will be presented this week at a neuropsychopharmacology conference. The University of Copenhagen researchers who carried out the trial say their findings confirm what others have suspected - although they only studied 11 people with Sad and 23 healthy volunteers for comparison. Using positron emission tomography (PET) brain scans, they were able to show significant summer-to-winter differences in the levels of the serotonin transporter (SERT) protein in Sad patients. The Sad volunteers had higher levels of SERT in the winter months, corresponding to a greater removal of serotonin in winter, while the healthy volunteers did not. Winter depression Lead researcher, Dr Brenda Mc Mahon, said: "We believe that we have found the dial the brain turns when it has to adjust serotonin to the changing seasons. BBC © 2014
By Jane E. Brody Within a week of my grandsons’ first year in high school, getting enough sleep had already become an issue. Their concerned mother questioned whether lights out at midnight or 1 a.m. and awakening at 7 or 7:30 a.m. to get to school on time provided enough sleep for 14-year-olds to navigate a demanding school day. The boys, of course, said “yes,” especially since they could “catch up” by sleeping late on weekends. But the professional literature on the sleep needs of adolescents says otherwise. Few Americans these days get the hours of sleep optimal for their age, but experts agree that teenagers are more likely to fall short than anyone else. Researchers report that the average adolescent needs eight and a half to nine and a half hours of sleep each night. But in a poll taken in 2006 by the National Sleep Foundation, less than 20 percent reported getting that much rest on school nights. With the profusion of personal electronics, the current percentage is believed to be even worse. A study in Fairfax, Va., found that only 6 percent of children in the 10th grade and only 3 percent in the 12th grade get the recommended amount of sleep. Two in three teens were found to be severely sleep-deprived, losing two or more hours of sleep every night. The causes can be biological, behavioral or environmental. And the effect on the well-being of adolescents — on their health and academic potential — can be profound, according to a policy statement issued in August by the American Academy of Pediatrics. “Sleep is not optional. It’s a health imperative, like eating, breathing and physical activity,” Dr. Judith A. Owens, the statement’s lead author, said in an interview. “This is a huge issue for adolescents.” © 2014 The New York Times Company
by Amy Standen The important thing is that Meghan knew something was wrong. When I met her, she was 23, a smart, wry young woman living with her mother and stepdad in Simi Valley, about an hour north of Los Angeles. Meghan had just started a training program to become a respiratory therapist. Concerned about future job prospects, she asked NPR not to use her full name. Five years ago, Meghan's prospects weren't nearly so bright. At 19, she had been severely depressed, on and off, for years. During the bad times, she'd hide out in her room making thin, neat cuts with a razor on her upper arm. "I didn't do much of anything," Meghan recalls. "It required too much brain power." "Her depression just sucked the life out of you," Kathy, Meghan's mother, recalls. "I had no idea what to do or where to go with it." One night in 2010, Meghan's mental state took an ominous turn. Driving home from her job at McDonald's, she found herself fascinated by the headlights of an oncoming car. "I had the weird thought of, you know, I've never noticed this, but their headlights really look like eyes." To Meghan, the car seemed malicious. It wanted to hurt her. Kathy tried to reason with her. "Honey, you know it's a car, right? You know those are headlights," she recalls pressing her daughter. "You understand that this makes no sense, right?" © 2014 NPR
Link ID: 20223 - Posted: 10.21.2014
By Catherine Saint Louis KATY, Tex. — Like many parents of children with autism, Nicole Brown feared she might never find a dentist willing and able to care for her daughter, Camryn Cunningham, now a lanky 13-year-old who uses words sparingly. Finishing a basic cleaning was a colossal challenge, because Camryn was bewildered by the lights in her face and the odd noises from instruments like the saliva suctioner — not to mention how utterly unfamiliar everything was to a girl accustomed to routine. Sometimes she’d panic and bolt from the office. Then in May, Ms. Brown, 45, a juvenile supervision officer, found Dr. Amy Luedemann-Lazar, a pediatric dentist in this suburb of Houston. Unlike previous dentists, Dr. Luedemann-Lazar didn’t suggest that Camryn would need to be sedated or immobilized. Instead, she suggested weekly visits to help her learn to be cooperative, step by step, with lots of breaks so she wouldn’t be overwhelmed. Bribery helped. If she sat calmly for 10 seconds, her reward was listening to a snippet of a Beyoncé song on her sister’s iPod. This month, Camryn sat still in the chair, hands crossed on her lap, for no less than 25 minutes through an entire cleaning — her second ever — even as purple-gloved hands hovered near her face, holding a noisy tooth polisher. At the end, Dr. Luedemann-Lazar examined Camryn’s teeth and declared her cavity-free and ready to see an orthodontist. “It was like a breakthrough,” Ms. Brown said, adding, “Dr. Amy didn’t just turn her away.” Parents of children with special needs have long struggled to find dentists who will treat them. In a 2005 study, nearly three-fifths of 208 randomly chosen general dentists in Michigan said they would not provide care for children on the autism spectrum; two-thirds said the same for adults. But as more and more children receive diagnoses of autism spectrum disorder, more dentists and dental hygienists are recognizing that with accommodations, many of them can become cooperative patients. © 2014 The New York Times Company
Link ID: 20222 - Posted: 10.21.2014
By David Bornstein Shortly after the birth of her daughter, Andrea became severely depressed. She was 17 at the time and she didn’t fully understand what she was going through; she just felt like a failure. “I felt like I didn’t want to be alive,” she recalls. “I felt like I didn’t deserve to be alive. I felt like a bad person and a bad mother, and I was never going to get any better.” When her baby persisted in crying, she felt her frustration mount quickly. “I was hitting a boiling point,” she says. “I was at a point where I didn’t want to deal with anything. Sometimes I would just let her cry — but then I would feel very bad afterwards.” Depression is the most common health problem women face. In the United States, outside of obstetrics, it is the leading cause of hospitalizations among women ages 15 to 44. It’s estimated that 20 percent to 25 percent of women will experience depression during their lifetimes, and about one in seven will experience postpartum depression. For low-income women, the rates are about twice as high. As my colleague Tina Rosenberg has reported, the World Health Organization ranks depression as the most burdensome of all health conditions affecting women (as measured by lost years of productive life). Postpartum depressions are often assumed to be associated with hormonal changes in women. In fact, only a small fraction of them are hormonally based, said Cindy-Lee Dennis, a professor at the University of Toronto and a senior scientist at Women’s College Research Institute, who holds a Canada Research Chair in Perinatal Community Health. The misconception is itself a major obstacle, she adds. Postpartum depression is often not an isolated form of depression; nor is it typical. “We now consider depression to be a chronic condition,” Dennis says. “It reoccurs in approximately 30 to 50 percent of individuals. And a significant proportion of postpartum depression starts during the pregnancy but is not detected or treated to remission. We need to identify symptoms as early as possible, ideally long before birth.” © 2014 The New York Times Company
Daniel Cressey The history of sex may have to be rewritten thanks to a group of unsightly, long-extinct fish called placoderms. A careful study1 of fossils of these armour-plated creatures, which gave rise to all current vertebrates with jaws, suggests that their descendants — our ancient ancestors — switched their sexual practices from internal to external fertilization, an event previously thought to be evolutionarily improbable. “This was totally unexpected,” says John Long, a palaeontologist at Flinders University in Adelaide, Australia, and lead author of the study, published in Nature1. “Biologists thought that there could not be a reversion back from internal fertilization to external fertilization, but we have shown it must have happened this way.” Go back far enough in your family tree — before placoderms — and your ancestors were rather ugly jawless fish who reproduced through external fertilization, in which sperm and eggs are expelled into the water to unite. Some of these distant relatives later gave rise to the jawless fish called lampreys that lurk in seas today and still use this method of reproduction. Bony organ Long's team studied placoderms, one of the earliest groups of jawed animals, and found structures in fossils that they interpret as bony ‘claspers’ — male organs that penetrate the female and deliver sperm. © 2014 Nature Publishing Group,
By KONIKA BANERJEE and PAUL BLOOM ON April 15, 2013, James Costello was cheering on a friend near the finish line at the Boston Marathon when the bombs exploded, severely burning his arms and legs and sending shrapnel into his flesh. During the months of surgery and rehabilitation that followed, Mr. Costello developed a relationship with one of his nurses, Krista D’Agostino, and they soon became engaged. Mr. Costello posted a picture of the ring on Facebook. “I now realize why I was involved in the tragedy,” he wrote. “It was to meet my best friend, and the love of my life.” Mr. Costello is not alone in finding meaning in life events. People regularly do so for both terrible incidents, such as being injured in an explosion, and positive ones, like being cured of a serious disease. As the phrase goes, everything happens for a reason. Where does this belief come from? One theory is that it reflects religious teachings — we think that events have meaning because we believe in a God that plans for us, sends us messages, rewards the good and punishes the bad. But research from the Yale Mind and Development Lab, where we work, suggests that this can’t be the whole story. In one series of studies, recently published in the journal Cognition, we asked people to reflect on significant events from their own lives, such as graduations, the births of children, falling in love, the deaths of loved ones and serious illnesses. Unsurprisingly, a majority of religious believers said they thought that these events happened for a reason and that they had been purposefully designed (presumably by God). But many atheists did so as well, and a majority of atheists in a related study also said that they believed in fate — defined as the view that life events happen for a reason and that there is an underlying order to life that determines how events turn out. © 2014 The New York Times Company
Link ID: 20219 - Posted: 10.20.2014
A drug being studied as a fast-acting mood-lifter restored pleasure-seeking behavior independent of — and ahead of — its other antidepressant effects, in a National Institutes of Health trial. Within 40 minutes after a single infusion of ketamine, treatment-resistant depressed bipolar disorder patients experienced a reversal of a key symptom — loss of interest in pleasurable activities — which lasted up to 14 days. Brain scans traced the agent’s action to boosted activity in areas at the front and deep in the right hemisphere of the brain. “Our findings help to deconstruct what has traditionally been lumped together as depression,” explained Carlos Zarate, M.D., of the NIH’s National Institute of Mental Health. “We break out a component that responds uniquely to a treatment that works through different brain systems than conventional antidepressants — and link that response to different circuitry than other depression symptoms.” This approach is consistent with the NIMH’s Research Domain Criteria project, which calls for the study of functions – such as the ability to seek out and experience rewards – and their related brain systems that may identify subgroups of patients in one or multiple disorder categories. Zarate and colleagues reported on their findings Oct. 14, 2014 in the journal Translational Psychiatry. Although it’s considered one of two cardinal symptoms of both depression and bipolar disorder, effective treatments have been lacking for loss of the ability to look forward to pleasurable activities, or anhedonia. Long used as an anesthetic and sometimes club drug, ketamine and its mechanism-of-action have lately been the focus of research into a potential new class of rapid-acting antidepressants that can lift mood within hours instead of weeks.
By Smitha Mundasad Health reporter, BBC News Scientists have uncovered hidden signatures in the brains of people in vegetative states that suggest they may have a glimmer of consciousness. Doctors normally consider these patients - who have severe brain injuries - to be unaware of the world around them although they appear awake. Researchers hope their work will help identify those who are actually conscious, but unable to communicate. Their report appears in PLoS Computational Biology. After catastrophic brain injuries, for example due to car crashes or major heart attacks, some people can appear to wake up yet do not respond to events around them. Doctors describe these patients as being in a vegetative state. Patients typically open their eyes and look around, but cannot react to commands or make any purposeful movements. Some people remain in this state for many years. But a handful of recent studies have questioned this diagnosis - suggesting some patients may actually be aware of what is going on around them, but unable to communicate. A team of scientists at Cambridge University studied 13 patients in vegetative states, mapping the electrical activity of their nerves using a mesh of electrodes applied to their scalps. The electrical patterns and connections they recorded were then compared with healthy volunteers. The study reveals four of the 13 patients had an electrical signature that was very similar to those seen in the volunteers. Dr Srivas Chennu, who led the research, said: "This suggests some of the brain networks that support consciousness in healthy adults may be well-preserved in a number of people in persistent vegetative state too." BBC © 2014
Link ID: 20217 - Posted: 10.18.2014
By Benedict Carey Sleep. Parents crave it, but children and especially teenagers, need it. When educators and policymakers debate the relationship between sleep schedules and school performance and — given the constraints of buses, sports and everything else that seem so much more important — what they should do about it, they miss an intimate biological fact: Sleep is learning, of a very specific kind. Scientists now argue that a primary purpose of sleep is learning consolidation, separating the signal from the noise and flagging what is most valuable. School schedules change slowly, if at all, and the burden of helping teenagers get the sleep they need is squarely on parents. Can we help our children learn to exploit sleep as a learning tool (while getting enough of it)? Absolutely. There is research suggesting that different kinds of sleep can aid different kinds of learning, and by teaching “sleep study skills,” we can let our teenagers enjoy the sense that they’re gaming the system. Start with the basics. Sleep isn’t merely rest or downtime; the brain comes out to play when head meets pillow. A full night’s sleep includes a large dose of several distinct brain states, including REM sleep – when the brain flares with activity and dreams – and the netherworld of deep sleep, when it whispers to itself in a language that is barely audible. Each of these states developed to handle one kind of job, so getting sleep isn’t just something you “should do” or need. It’s far more: It’s your best friend when you want to get really good at something you’ve been working on. So you want to remember your Spanish vocabulary (or “How I Met Your Mother” trivia or Red Sox batting averages)? © 2014 The New York Times Company
Clare Pain Eating a high fat and high carb diet resulted in inflammation in the brain - at least in male mice. We'll have to wait to see if the same process applies to male humans. The detrimental impact of junk food seems to be connected to inflammation in the brains of male mice, with the brains of females protected by oestrogen, according to research published today in Cell Reports. Dr Deborah Clegg, who led the study while at University of Texas Southwestern Medical Centre, Dallas, USA, was building on existing research that links brain inflammation with obesity and heart disease in male mice. "We embarked on this research because [the link with inflammation] had been shown in male mice, so we asked ourselves, do the same processes occur in females?" explains Clegg. Previous research has shown that one cause of inflammation in the hypothalamus - the part of the brain that controls energy balance - is palmitic acid, a saturated fatty acid found in palm oil, dairy products and meat, and common in high fat food. The team looked at male and female mice, fed either their normal diet or a 'high fat' diet. Besides containing 42 per cent fat, the high fat diet was also high in carbohydrates making it a good correlate of human junk food, says Clegg. © 2014 ABC
by Flora Graham This glowing blue web of neurons is usually what researchers examine when searching for a cure for Parkinson's. But a new study, part-funded by Parkinson's UK, hones in on the tiny yellow dots. These are the connections between brain cells known as synapses, has discovered a killer that targets these links, potentially paving the way for new treatments. Soledad Galli at University College London and her colleagues have found that the death of synapses in mice may be due to malfunctioning proteins called Wnt proteins. "If we confirm that Wnt is involved in the early stages of Parkinson's, this throws up exciting possibilities, not just for new treatment targets, but also for new ways to identify people with Parkinson's early on in their condition," says Galli. Most patients currently depend on the drug levodopa, which is over 50 years old and can have severe side-effects, in addition to becoming less effective over time. Moreover, it only masks the symptoms: there is no cure for Parkinson's and no way to stop its progression. Journal reference: Nature Communications, DOI: 10.1038/ncomms5992 © Copyright Reed Business Information Ltd
|By Amy Yee Pouring a bucket of ice water over one’s head may seem like a distant summer memory. But although the “ice bucket challenge” craze has died down, public awareness of amyotrophic lateral sclerosis (ALS), commonly known as Lou Gehrig’s disease, has never been stronger. The viral video campaign raised $115 million from more than 3 million donors for the ALS Association. In one month, from July 29 to August 29, donors raised $100.9 million, compared with $2.8 million during the same period the previous year. In early October, the ALS Association began spending that money. It approved $21.7 million of funding for six programs and initiatives by groups that include the academic-industry partnership ALS Accelerated Therapeutics, the New York Genome Center, three California labs that form the Neuro Collaborative, and Project MinE, which will map the genomes of 15,000 people with ALS (about 10 percent of ALS patients have a family member with the disease). The grants focus on developing gene therapies for common ALS genes and exploring approaches to counter two major contributors to the disease, the inflammation of nervous tissue and misfolded proteins in brain cells that control movement. These efforts may not only someday lead to new treatments, but may also point to the cause of ALS. At the level of basic research, scientists do not have a dominant theory from which to work, notes Tom Jessell, a neuroscientist and co-director of Columbia University’s new Zuckerman Mind Brain Behavior Institute. Jessell is also the chair of the research advisory board of Project ALS, a nonprofit that identifies and funds ALS research. © 2014 Scientific American
Keyword: ALS-Lou Gehrig's Disease
Link ID: 20213 - Posted: 10.18.2014
by Penny Sarchet He's sexy and he knows it. The little devil frog is noisy in pursuit of a partner, and doesn't care who hears him. The little devil frog's fearlessness in the face of hungry predators could be down to his toxicity. The little devil, Oophaga sylvatica, is a member of the dendrobatid group of poisonous frogs. His bright colours warn predators that he is unsafe to eat, which Juan Santos of the University of British Columbia in Vancouver, Canada, believes has allowed the evolution of more flamboyant mating calls. Santos and his colleagues examined the calls, colourings and toxicity of 170 species of frog, including the little devil. They found a strong relationship between the volume of a frog's call and its aposematism – markings that warn of its toxicity. In general, the more toxic a frog, the brighter and more noticeable it is – and the louder and more rapidly it sings (Proceedings of the Royal Society B ). Non-toxic frogs are camouflaged and call from less exposed perches, says Santos. "Females can have a significant effect on the selection of the most noisy males, given that predators will avoid these aposematic individuals," says Santos. The male's calls can travel over long distances, in an attempt to attract a mate. But it's not just about attracting a female frog's attention – it's about letting her know how desirable he is. © Copyright Reed Business Information Ltd.
|By Steve Mirsky People have been leaving messages on bathroom walls for thousands of years. Just google “ancient Roman bathroom graffiti.” But we’re not the only ones to use latrines for information exchange—as two German researchers have confirmed after hundreds of hours watching lemurs pee and poop. For science. Primatologists Iris Dröscher and Peter Kappeler concentrated on seven sets of pair-bonded members of a species called white-footed sportive lemurs, at a nature reserve in southern Madagascar. Their report is in the journal Behavioral Ecology and Sociobiology. [Iris Dröscher & Peter M. Kappeler Maintenance of familiarity and social bonding via communal latrine use in a solitary primate (Lepilemur leucopus)] Many animals use the same spots repeatedly to do their business, primates in particular. For these lemurs, a specific tree becomes the urine and feces focal point. And because chemical compounds in their waste transmit information, the so-called latrine tree becomes like a bulletin board to post messages for the rest of the community. Based on their 1,097 hours of observations, the researchers conclude that urine and glandular secretions left on the tree trunk are the primary message vehicles. Feces mostly just collects on the ground. Some urine telegrams are probably signals from a particular lemur to the neighbors that he or she is around. But male lemurs upped their latrine visits when potential competitors for females came into their home area. So the frequent chemical messages left on the tree probably say in that case, “Buzz off, buddy, she’s with me.” In lemur. © 2014 Scientific American,
2014 by Andy Coghlan Seeing is definitely believing when it comes to stem cell therapy. A blind man has recovered enough sight to ride his horse. A woman who could see no letters at all on a standard eye test chart can now read the letters on the top four lines. Others have recovered the ability to see colour. All have had injections of specialised retinal cells in their eyes to replace ones lost through age or disease. A trial in 18 people with degenerative eye conditions is being hailed as the most promising yet for a treatment based on human embryonic stem cells. "We've been hearing about their potential for more than a decade, but the results have always been in mice and rats, and no one has shown they're safe or effective in humans long term," says Robert Lanza of Advanced Cell Technology in Marlborough, Massachusetts, the company that carried out the stem cell intervention. "Now, we've shown both that they're safe and that there's a real chance these cells can help people." Ten years ago, the team at Advanced Cell Technology announced that it had successfully converted human embryonic stem cells into retinal pigment epithelial cells. These cells help keep the eyes' light-detecting rods and cones healthy. But when retinal pigment epithelial cells deteriorate, blindness can occur. This happens in age-related macular degeneration and Stargardt's macular dystrophy. In a bid to reverse this, Lanza's team injected retinal cells into one of each of the 18 participants' eyes, half of whom had age-related macular degeneration and half had Stargardt's. A year later, 10 people's eyes had improved, and the eyes of the others had stabilised. Untreated eyes had continued to deteriorate. © Copyright Reed Business Information Ltd.
BY Bethany Brookshire Stress is our coping response. Whether emotional or physical, stress is how organisms react to upheaval in their lives. And in many cases, that response requires tradeoffs. An animal will make it through now, but may come out with fewer fat stores or a shorter life span. But a new study shows that under certain conditions, developmental stress in male zebra finches might have a positive effect, in the form of more offspring to carry on his genes. Ondi Crino, a biologist now at Macquarie University in Sydney, examined how stress during development might affect reproductive success in male zebra finches. She purchased 10 male and 10 female zebra finches from pet shops near the University of Montana. The birds were allowed to pair off and nest. When the first batch of chicks was 12 days old, Crino fed half of the male offspring peanut oil, and half peanut oil with the hormone corticosterone mixed in. Both humans and finches produce stress-related hormones. Humans produce cortisol, while finches produce corticosterone. These two hormones increase during times of stress and cause many of the negative effects we associate with worry and pressure. So administering corticosterone is one method of “stressing” an animal without changing anything else in its environment. The dose was in the range of what a young bird might experience in the midst of a natural upheaval such as a cold snap or famine. After 16 days of the peanut oil supplement, the young male birds receiving corticosterone were smaller than their relaxed counterparts. They also had a larger spike in their own corticosterone levels when they were stressed. But over time, the chicks that received corticosterone appeared to grow out of their stressful upbringing. By adulthood they were the same size as controls, and they did not show frazzled feathers or pale colors that might indicate a rough chickhood. © Society for Science & the Public 2000 - 2014
By Jane E. Brody In the 1997 film “As Good As It Gets,” Jack Nicholson portrays Melvin Udall, a middle-aged man with obsessive-compulsive disorder who avoids stepping on cracks, locks doors and flips light switches exactly five times, and washes his hands repeatedly, each time tossing out the new bar of soap he used. He brings wrapped plastic utensils to the diner where he eats breakfast at the same table every day. Though the film is billed as a romantic comedy, Melvin’s disorder is nothing to laugh about. O.C.D. is often socially, emotionally and vocationally crippling. It can even be fatal. Four years ago, John C. Kelly, 24, killed himself in Irvington, N.Y., after a long battle with a severe form of obsessive-compulsive disorder. Mr. Kelly was a devoted baseball player, and now friends hold an annual softball tournament to raise money for the foundation established in his honor to increase awareness of the disorder. Obsessive thoughts and compulsive behaviors occur in almost every life from time to time. I have a fair share of compulsive patterns: seasonings arranged in strict alphabetical order; kitchen equipment always put back the same way in the same place; two large freezers packed with foods just in case I need them. I hold onto a huge collection of plastic containers, neatly stacked with their covers, and my closets bulge with clothes and shoes I haven’t worn in years, and probably never will again — yet cannot bring myself to give away. But these common habits fall far short of the distressing obsessions and compulsions that are the hallmarks of O.C.D.: intrusive, disturbing thoughts or fears that cannot be ignored and compel the sufferer to engage in ritualistic, irrational behaviors to relieve the resulting anxiety.
Keyword: OCD - Obsessive Compulsive Disorder
Link ID: 20208 - Posted: 10.16.2014
By Josie Gurney-Read, Online Education Editor Myths about the brain and how it functions are being used to justify and promote teaching methods that are essentially “ineffective”, according to new research. The study, published today in Nature Reviews Neuroscience, began by presenting teachers in the UK, Turkey, Greece, China and the Netherlands, with seven myths about the brain and asked them whether they believed the myths to be true. According to the figures, over half of teachers in the UK, the Netherlands and China believe that children are less attentive after sugary drinks and snacks and over a quarter of teachers in the UK and Turkey believe that a pupil’s brain will shrink if they drink fewer than six to eight glasses of water a day. Furthermore, over 90 per cent of teachers in all countries believe that a student will learn better if they receive information in their preferred learning style – auditory, visual, kinaesthetic. This is despite the fact that there is "no convincing evidence to support this theory". Dr Paul Howard-Jones, author of the article from Bristol University’s Graduate School of Education, said that many teaching practices are “sold to teachers as based on neuroscience”. However, he added that, in many cases, these ideas have “no educational value and are often associated with poor practice in the classroom.” The prevalence of many of these “neuromyths” in different countries, could reflect the absence of any teacher training in neuroscience, the research concludes. Dr Howard-Jones warned that this could mean that many teachers are “ill-prepared to be critical of ideas and educational programmes that claim a neuroscientific basis.” © Copyright of Telegraph Media Group Limited 2014
Keyword: Learning & Memory
Link ID: 20207 - Posted: 10.16.2014
By ALEX STONE Smell is one of the oldest human faculties, yet it was one of the last to be understood by scientists. It was not until the early 1990s that biologists first described the inner workings of olfactory receptors — the chemical sensors in our noses — in a discovery that won a Nobel Prize. Since then, the plot has thickened. Over the last decade or so, scientists have discovered that odor receptors are not solely confined to the nose, but found throughout body — in the liver, the heart, the kidneys and even sperm — where they play a pivotal role in a host of physiological functions. Now, a team of biologists at Ruhr University Bochum in Germany has found that our skin is bristling with olfactory receptors. “More than 15 of the olfactory receptors that exist in the nose are also found in human skin cells,” said the lead researcher, Dr. Hanns Hatt. Not only that, but exposing one of these receptors (colorfully named OR2AT4) to a synthetic sandalwood odor known as Sandalore sets off a cascade of molecular signals that appears to induce healing in injured tissue. In a series of human tests, skin abrasions healed 30 percent faster in the presence of Sandalore, a finding the scientists think could lead to cosmetic products for aging skin and to new treatments to promote recovery after physical trauma. The presence of scent receptors outside the nose may seem odd at first, but as Dr. Hatt and others have observed, odor receptors are among the most evolutionarily ancient chemical sensors in the body, capable of detecting a multitude of compounds, not solely those drifting through the air. “If you think of olfactory receptors as specialized chemical detectors, instead of as receptors in your nose that detect smell, then it makes a lot of sense for them to be in other places,” said Jennifer Pluznick, an assistant professor of physiology at Johns Hopkins University who in 2009 found that olfactory receptors help control metabolic function and regulate blood pressure in the kidneys of mice. © 2014 The New York Times Company
Keyword: Chemical Senses (Smell & Taste)
Link ID: 20206 - Posted: 10.14.2014