Chapter 16. None
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Are you good at picking someone out of a crowd? Most of us are better at recognising faces than distinguishing between other similar objects, so it’s long been suspected there’s something mysterious about the way the brain processes a face. Now further evidence has emerged that this is a special, highly evolved skill. A study of twins suggests there are genes influencing face recognition abilities that are distinct from the ones affecting intelligence – so it’s not that people who are good with faces just have a better memory, for instance. “The idea is that telling friend from foe was so important to survival that there was very strong pressure to improve that trait,” says Nicholas Shakeshaft of King’s College London. Previous studies using brain scanning have suggested there is a part of the brain dedicated to recognising faces, called the fusiform face area. But others have suggested this region may in fact just be used for discriminating between any familiar objects. Wondering if genetics could shed any light, Shakeshaft’s team tested more than 900 sets of UK twins – including both identical and non-identical pairs – on their face recognition skills. The ability turned out to be highly heritable, with identical twins having more similar abilities than fraternal ones. The same went for intelligence, which had earlier been tested as part of a long-running study. © Copyright Reed Business Information Ltd.
By Puneet Kollipara The list of health problems that scientists can confidently link to exposure to hormone-disrupting chemicals has grown to include diabetes, cardiovascular disease, and obesity, a new scientific statement suggests. The statement, released today by the Endocrine Society, also adds support to the somewhat controversial idea that even minute doses of these chemicals can interfere with the activity of natural hormones, which play a major role in regulating physiology and behavior. But the report—which updates a similar statement released in 2009—is drawing sharp criticism from the chemical industry. An executive summary of the new statement, which synthesizes 1300 studies on endocrine disrupters, posits that scientists are more confident than ever before in linking these substances to a host of known health issues, including reproductive and developmental problems, thyroid impairment, certain reproductive cancers, and neurodevelopmental problems such as decreased IQ. But studies suggest those links can now be extended to heart and weight problems, and diabetes, says the executive summary's first author, Andrea C. Gore, a professor of pharmacology and toxicology at the University of Texas, Austin. Six years ago, scientists couldn’t make such a strong case for those links, Gore says, because there weren’t enough good studies. “But this has really been an emerging field where there is much stronger evidence now,” Gore told reporters today on a conference call. Still, some toxicologists and industry groups have long disputed the assertion that endocrine disrupters can trigger effects at minimal doses; this idea can be tough to test in lab animals, which are usually exposed to high doses in toxicology studies. © 2015 American Association for the Advancement of Science
Neuroscientist Dr. Charles Tator has asked the family of former NHL enforcer Todd Ewen to donate Ewen's brain so he can study it. This week, Ewan's death was ruled a suicide and Tator wants to examine his brain to determine whether it has signs of degeneration. In particular, he's interested in what Ewen's brain may have in common with the other brains of athletes he's studying as part of the Canadian Sports Concussion Project. Brent Bambury speaks with Dr. Tator about how concussions can affect athletes and what big unanswered questions remain when it comes to the links between concussions, brain injury and self-harm. This conversation has been edited for clarity and length. Brent Bambury: You and your team already have examined the brains of eighteen former professional athletes. What do you hope to learn by looking at Todd Ewen's brain? Dr. Charles Tator: Well we want to know if he had C.T.E. In other words, was this the cause of his decline in terms of depression, for example. BB: What is C.T.E. ? CT: Well C.T.E. is chronic traumatic encephalopathy which is a specific type of brain degeneration that occurs after repetitive trauma like multiple concussions. BB: Is that something that you can only determine by examining the brain from a cadaver? CT: Unfortunately, even though we are getting clues about it from other tests like M.R.I., at this point in 2015, you have to do an autopsy to be sure that it's C.T.E. So with the Todd Ewen donation, if we're fortunate enough to have that opportunity to examine his brain, we would want to see if there were any manifestations of these previous concussions that he had in his career. ©2015 CBC/Radio-Canada
Keyword: Brain Injury/Concussion
Link ID: 21450 - Posted: 09.28.2015
A 26-year-old man who is paralysed in both legs has walked for the first time in five years – just by thinking about it. He is the first person to have his brain activity recorded and used to control a muscle-stimulating device in his legs. Every year, 250,000 to 500,000 people worldwide suffer spinal cord injuries, which can leave them partially or completely paralysed below the site of damage. Many rehabilitation clinics already offer functional electric stimulation (FES) devices, which activate the nerves that innervate leg muscles at the push of a button. But people with upper-body paralysis are not always able to operate the FES in this way. The new system bypasses the button and returns control to the brain. “We want to re-establish the connection between the brain and the leg muscles, to bring back the function that was once present,” says Zoran Nenadic at the University of California Irvine. To do that, Nenadic and his colleagues combined an FES system with a brain-computer interface. The team developed an electrode cap that picks up the brainwaves created when a person thinks specifically about walking or standing still. They tailored the device to pick up brain signals from their volunteer – a man who has had little sensation below his shoulder blades for five years. © Copyright Reed Business Information Ltd.
Link ID: 21437 - Posted: 09.24.2015
By Jessica Schmerler Selfies, headshots, mug shots — photos of oneself convey more these days than snapshots ever did back in the Kodak era. Most digitally minded people continually post and update pictures of themselves at professional, social media and dating sites such as LinkedIn, Facebook, Match.com and Tinder. For better or worse, viewers then tend to make snap judgments about someone’s personality or character from a single shot. As such, it can be a stressful task to select the photo that conveys the best impression of ourselves. For those of us seeking to appear friendly and trustworthy to others, a new study underscores an old, chipper piece of advice: Put on a happy face. A newly published series of experiments by cognitive neuroscientists at New York University is reinforcing the relevance of facial expressions to perceptions of characteristics such as trustworthiness and friendliness. More importantly, the research also revealed the unexpected finding that perceptions of abilities such as physical strength are not dependent on facial expressions but rather on facial bone structure. The team’s first experiment featured photographs of 10 different people presenting five different facial expressions each. Study subjects rated how friendly, trustworthy or strong the person in each photo appeared. A separate group of subjects scored each face on an emotional scale from “very angry” to “very happy.” And three experts not involved in either of the previous two ratings to avoid confounding results calculated the facial width-to-height ratio for each face. An analysis revealed that participants generally ranked people with a happy expression as friendly and trustworthy but not those with angry expressions. Surprisingly, participants did not rank faces as indicative of physical strength based on facial expression but graded faces that were very broad as that of a strong individual. © 2015 Scientific American
Link ID: 21436 - Posted: 09.24.2015
By Kristin Ozelli Four years ago writer and producer Jon Palfreman was diagnosed with Parkinson’s disease. He has chronicled his experience and that of many other “Parkies,” as patients sometimes call themselves, in two books, the latest of which is Brain Storms: The Race to Unlock the Mysteries of Parkinson’s Disease, published this year by Scientific American / Farrar, Straus and Giroux, which traces some of the recent progress of medical researchers in treating this disease. He shared with Scientific American MIND senior editor Kristin Ozelli some of the insights he gleaned while working on this book. You wrote an earlier book about Parkinson’s and produced a prize-winning documentary, The Case of the Frozen Addicts, and have experienced the disease personally. While you were researching Brain Storms, was there anything new you learned about the disease that really surprised you? What is truly surprising is just how long biomedical research takes to deliver life-changing therapies. The promising therapies around when I wrote my first book 20 years ago, like neural grafting and growth factors—therapies designed to replace, revive or protect dopamine neurons—well they haven’t panned out. On the other hand, since my first involvement with Parkinson’s, there have been some extraordinary advances in basic science. In a sense, the disease has been rebranded from a movement disorder (resulting from damage to a very small part of the brain) to a systemic condition involving not only tremor and rigidity but also a whole host of symptoms—from depression to sleep disorders, from constipation to dementia. Indeed, there’s an entirely new theory of the disease that sees it as being driven by a protein alpha-synuclein that goes rogue and, prionlike, jumps from neuron to neuron creating havoc. © 2015 Scientific American
Link ID: 21435 - Posted: 09.23.2015
Erin Wayman Priya Rajasethupathy’s research has been called groundbreaking, compelling and beautifully executed. It’s also memorable. Rajasethupathy, a neuroscientist at Stanford University, investigates how the brain remembers. Her work probes the molecular machinery that governs memories. Her most startling — and controversial — finding: Enduring memories may leave lasting marks on DNA. Being a scientist wasn’t her first career choice. Although Rajasethupathy inherited a love of computation from her computer scientist dad, she enrolled in Cornell University as a pre-med student. After graduating in three years, she took a year off to volunteer in India, helping people with mental illness. During that year she also did neuroscience research at the National Centre for Biological Sciences in Bangalore. While there, she began to wonder whether microRNAs, tiny molecules that put protein production on pause, could play a role in regulating memory. She pursued that question as an M.D. and Ph.D. student at Columbia University (while intending, at least initially, to become a physician). She found some answers in the California sea slug (Aplysia californica). In 2009, she and colleagues discovered a microRNA in the slug’s nerve cells that helps orchestrate the formation of memories that linger for at least 24 hours. © Society for Science & the Public 2000 - 2015.
Keyword: Learning & Memory
Link ID: 21434 - Posted: 09.23.2015
By Virginia Morell Standing 2 meters tall and weighing as much as 1000 kilograms, European bison (Bison bonasus) are impressive animals. These cousins of the American bison—nearly driven to extinction in the last century—are being reintroduced in small herds across Europe, leading some farmers and forest managers to worry that the large herbivores will destroy their habitat. To better understand how the bison decide when and where to move, scientists studied a herd of 43 individuals in the Reserve Biologique des Monts-d’Azur in the Alpes-Maritimes region of France. They recorded the animals’ movements for 4 hours daily, identifying leaders, what type of action led others to follow, and where the herd moved. The herd wasn’t guided by a single leader, the scientists report in the November issue of Animal Behaviour. Instead, any individual regardless of sex or age could prompt the group to move, although most decisions were made by adult females—as is the case with most ungulates. A bison shows that it plans to change its location by taking at least 20 steps without stopping or lowering its head to graze. A potential leader was most likely to be followed if it walked in the direction that most of the others were facing—suggesting that bison vote with their feet. The researchers suspect that most leaders are adult females because they require higher quality food when lactating or pregnant. Wildlife managers can use this research to reduce human-bison conflicts, the scientists say. They need only identify a herd’s leaders, fit them with GPS collars, and install a virtual fence of alarms and electrical shocks. It should then be possible to control the leaders’ movements—and, thus, those of the entire herd.
Keyword: Sexual Behavior
Link ID: 21432 - Posted: 09.23.2015
David Cyranoski A dispute has broken out at two of China’s most prestigious universities over a potentially groundbreaking discovery: the identification of a protein that may allow organisms to sense magnetic fields. On 14 September, Zhang Sheng-jia, a neuroscientist at Tsinghua University in Beijing, and his colleagues published a paper1 in Science Bulletin claiming to use magnetic fields to remotely control neurons and muscle cells in worms, by employing a particular magnetism-sensing protein. But Xie Can, a biophysicist at neighbouring Peking University, says that Zhang’s publication draws on a discovery made in his laboratory, currently under review for publication, and violates a collaboration agreement the two had reached. Administrators at Tsinghua and Peking universities, siding with Xie, have jointly requested that the journal retract Zhang’s paper, and Tsinghua has launched an investigation into Zhang’s actions. The dispute revolves around an answer to the mystery of how organisms as diverse as worms, butterflies, sea turtles and wolves are capable of sensing Earth’s magnetic field to help them navigate. Researchers have postulated that structures in biological cells must be responsible, and dubbed these structures magnetoreceptors. But they have never been found. In research starting in 2009, Xie says that he used a painstaking whole-genome screen to identify a protein containing iron and sulfur that seems, according to his experiments, to have the properties of a magnetoreceptor. He called it MagR, to note its purported properties, and has since been examining its function and structure to determine how it senses magnetic fields. © 2015 Nature Publishing Group,
Keyword: Animal Migration
Link ID: 21431 - Posted: 09.22.2015
Steve Connor A painkiller widely used to treat rheumatoid arthritis has been shown to reverse the symptoms of dementia in the brains of laboratory mice, raising hope that there may soon be an effective treatment for Alzheimer’s disease, scientists have said. The drug, salsalate, is a licensed pain killer but in mice with a form of dementia similar to Alzheimer’s it reversed the changes to a key protein in the brain that builds up in patients with the debilitating neurological disease, they found. The researchers said it is the first time any drug has been shown to have an effect on the “tau” protein that accumulates in the brain of people with Alzheimer’s and a range of similar dementias known as “tauopathies”. It could lead to an effective therapy even for patients in the later stages of disease, the researchers said. “We identified for the first time a pharmacological approach that reverses all aspects of tau toxicity," said Li Gan, PhD of the Gladstone Institutes, a non-profit research organisation affiliated with the University of California, San Francisco. “Remarkably, the profound protective effects of salsalate were achieved even though it was administered after disease onset, indicating that it may be an effective treatment option,” said Dr Gan a senior co-author of the study published in the journal Nature Medicine. As many as 800,000 people in Britain are already affected by Alzheimer’s disease and a new study has suggested that as many as one in three babies born this year will get dementia in their lifetime, largely as a result of people living longer. Age is the biggest risk factor for the disease. © independent.co.uk
Link ID: 21428 - Posted: 09.22.2015
By John Pavlus The “brain in a vat” has long been a staple of philosophical thought experiments and science fiction. Now scientists are one step closer to creating the real thing, which could enable groundbreaking experiments of a much more empirical kind. Research teams at Stanford University and the RIKEN Center for Developmental Biology in Japan have each discovered methods for coaxing human stem cells to form three-dimensional neural structures that display activity associated with that of an adult brain. By applying a variety of chemical growth factors, the RIKEN researchers transformed human embryonic stem cells into neurons that self-organized in patterns unique to the cerebellum, a region of the brain that coordinates movement. The Stanford team worked with induced pluripotent stem cells derived from skin cells and chemically nudged them to become neurons that spontaneously wired up into networks of 3-D circuits, much like the ones found in the cerebral cortex—the wrinkled gray matter of the brain that supports attention, memory and self-awareness in humans. “For years people have used mouse embryonic stem cells to generate teratomas—things that look like they could be organs,” says David Panchision, a neuroscientist at the National Institutes of Health, which supported the Stanford research. “But it's not organized and systematic, the way a developing brain needs to be to function.” In contrast, the Stanford team's neural structures not only self-assembled as cortexlike tissue, the neurons also sent signals to one another in coordinated patterns—just as they would in a brain. The cerebellar tissue generated by the Japanese scientists did, too. © 2015 Scientific American
Keyword: Development of the Brain
Link ID: 21427 - Posted: 09.21.2015
By MATTHEW HUTSON ANGER is a primal and destructive emotion, disrupting rational discourse and inflaming illogical passions — or so it often seems. Then again, anger also has its upsides. Expressing anger, for example, is known to be a useful tool in negotiations. Indeed, in the past few years, researchers have been learning more about when and how to deploy anger productively. Consider a forthcoming paper in the November issue of the Journal of Experimental Social Psychology. Researchers tested the effectiveness of expressing anger in three types of negotiations: those that are chiefly cooperative (say, starting a business with a partner), chiefly competitive (dissolving a shared business) or balanced between the two (selling a business to a buyer). In two experiments, negotiators made greater concessions to those who expressed anger — but only in balanced situations. When cooperating, hostility seems inappropriate, and when competing, additional heat only flares tempers. But in between, anger appears to send a strategically useful signal. What does that signal communicate? According to a 2009 paper in Proceedings of the National Academy of Sciences, anger evolved to help us express that we feel undervalued. Showing anger signals to others that if we don’t get our due, we’ll exert harm or withhold benefits. As they anticipated, the researchers found that strong men and attractive women — those who have historically had the most leverage in threatening harm and conferring benefits, respectively — were most prone to anger. The usefulness of anger in extracting better treatment from others seems to be something we all implicitly understand. A 2013 paper in the journal Cognition and Emotion found that when people were preparing to enter a confrontational negotiation, as opposed to a cooperative one, they took steps to induce anger in themselves (choosing to listen to aggressive versus happy music, for example). © 2015 The New York Times Company
Link ID: 21426 - Posted: 09.21.2015
William Sutcliffe Most epidemics are the result of a contagious disease. ADHD – Attention Deficit Hyperactivity Disorder – is not contagious, and it may not even be a genuine malady, but it has acquired the characteristics of an epidemic. New data has revealed that UK prescriptions for Ritalin and other similar ADHD medications have more than doubled in the last decade, from 359,100 in 2004 to 922,200 last year. In America, the disorder is now the second most frequent long-term diagnosis made in children, narrowly trailing asthma. It generates pharmaceutical sales worth $9bn (£5.7bn) per year. Yet clinical proof of ADHD as a genuine illness has never been found. Sami Timimi, consultant child psychiatrist at Lincolnshire NHS Trust and visiting professor of child psychiatry, is a vocal critic of the Ritalin-friendly orthodoxy within the NHS. While he is at pains to stress that he is “not saying those who have the diagnosis don’t have any problem”, he is adamant that “there is no robust evidence to demonstrate that what we call ADHD correlates with any known biological or neurological abnormality”. The hyperactivity, inattentiveness and lack of impulse control that are at the heart of an ADHD diagnosis are, according to Timimi, simply “a collection of behaviours”. Any psychiatrist who claims that a behaviour is being caused by ADHD is perpetrating a “philosophical tautology” – he is doing nothing more than telling you that hyperactivity is caused by an alternative name for hyperactivity. There is still no diagnostic test – no marker in the body – that can identify a person with ADHD. The results of more than 40 brain scan studies are described by Timimi as “consistently inconsistent”. No conclusive pattern in brain activity had been found to explain or identify ADHD. © independent.co.uk
Link ID: 21425 - Posted: 09.21.2015
By Michael Balter Are some animals smarter than others? It’s hard to say, because you can’t sit a chimpanzee or a mouse down at a table for an IQ test. But a new study, in which scientists tested wild robins on a variety of skills, concludes that they do differ in the kind of “general intelligence” that IQ tests are supposed to measure. General intelligence is usually defined as the ability to do well on multiple cognitive tasks, from math skills to problem solving. For years, researchers have questioned whether measurable differences exist in humans and nonhumans alike. In humans, factors like education and socioeconomic status can affect performance. When it comes to animals, the problem is compounded for two main reasons: First, it is very difficult to design and administer tests that pick up on overall smarts instead of specific skills, such as the keen memories of food-hoarding birds or the fine motor skills of chimpanzees that make tools for finding insects in trees. Second, differences in animal test scores can depend on how motivated they are to perform. Because most experiments award would-be test-takers with food, an empty (or a full) stomach might be all it takes to skew the results. Thus, even studies that suggest variations in intelligence among mice, birds, and apes all carry the caveat that alternative explanations could be at play. To get around some of these limitations, a team led by Rachael Shaw, an animal behavior researcher at Victoria University of Wellington, turned to a population of New Zealand North Island robins for a new round of experiments. The robins live at the Zealandia wildlife sanctuary, a 225-hectare nature paradise in Wellington where more than 700 of the birds live wild and protected from predators in the middle of the city. © 2015 American Association for the Advancement of Science.
Mo Costandi The human brain is often said to be the most complex object in the known universe, and there’s good reason to believe that this old cliché is true. Even the apparently simple task of compiling a census of the different types of cells it contains has proven to be extremely difficult. Researchers still can’t agree on the best way to classify the numerous sub-types of neurons, and different methods produce different results, so estimates range from several hundred to over a thousand. Basket cells illustrate this neuronal identity crisis perfectly. They are currently sub-divided into multiple different types, according to their shape, electrical properties, and molecular profiles. After nearly ten years of detective work, researchers at King’s College London now reveal them to be masters of disguise. In a surprising new study, they show that these cells can dynamically switch from one identity to another in response to neuronal network activity. Basket cells are a type of interneuron, which are found scattered throughout the cerebral cortex, hippocampus, and cerebellum, and make up about 5% of the total number of cells in these brain regions. They form local circuits with each other and with pyramidal neurons, the much larger and more numerous cells that transmit information to distant parts of the brain, and synthesize the inhibitory neurotransmitter GABA, which dampens pyramidal cell activity when released. These enigmatic cells are thought to exist in more than twenty different types, the best known being the fast-spiking ones, which respond rapidly to incoming signals, and slower ones, which respond after a delay. During brain development, immature forms of all types of basket cells are created in a structure called the medial ganglionic eminence, along with various other types of brain cells. They then migrate into the developing cerebral cortex, before going on to form synaptic connections with other cells. © 2015 Guardian News and Media Limited
Keyword: Development of the Brain
Link ID: 21423 - Posted: 09.20.2015
We all have our favourite movie moments, ones we love to watch again from time to time. Now it seems chimpanzees and bonobos, too, have the nous to recall thrilling scenes in movies they have previously seen and anticipate when they are about to come up. The results suggest apes can readily recall and anticipate significant recent events, just by watching those events once. Rather than use hidden food as a memory test, Japanese researchers made short movies and showed them to apes on two consecutive days. “We showed a movie instead, and asked whether they remember it when they only watch an event once, and an event totally new to them,” says Fumihiro Kano of Kyoto University in Japan. “Their anticipatory glances told us that they did.” Plot moment Kano and his colleague Satoshi Hirata made and starred in two short films. Another of the characters was a human dressed up as an ape in a King Kong costume who carried out attacks on people, providing the key plot moment in the first movie (see video). Both films were designed to contain memorable dramatic events, and the researchers deployed laser eye-tracking technology to see if the animals preferentially noticed and remembered these moments. © Copyright Reed Business Information Ltd.
Keyword: Learning & Memory
Link ID: 21421 - Posted: 09.20.2015
By C. CLAIBORNE RAY A. Wild canines that rely on strenuous hunting to survive may sleep or rest as much as, or even more than, indolent human-created breeds that rely on a can or a bag of kibble. Domestic dogs, with their great range of body types and personalities, show a tremendous variety of sleep patterns, often including relatively brief periods of deep sleep spread out over several hours. A half-century-long study of wolves and their interaction with their prey on Isle Royale, a wilderness island in Lake Superior, found that in winter the wolves would feed for hours on a fresh kill, then sprawl out or curl up in the snow and rest or sleep about 30 percent of the time. “Wolves have plenty of reason to rest,” the study’s researchers wrote. “When wolves are active, they are really active. On a daily basis, wolves burn about 70 percent more calories compared to typical animals of similar size.” The researchers note that while hunting, wolves may burn calories at 10 to 20 times the rate they do while resting. “When food is plentiful, wolves spend a substantial amount of time simply resting, because they can,” the study said. “When food is scarce, wolves spend much time resting because they need to.” Wolves may eat only once every five to 10 days, the researchers said, losing as much as 8 to 10 percent of body weight, but regaining all the lost weight in just two days of eating and resting. © 2015 The New York Times Company
Link ID: 21419 - Posted: 09.20.2015
By David Grimm The journal Nature is revising its policy on publishing animal experiments after a study it ran in 2011 received criticism because the authors allowed tumors to grow excessively large in mice. The paper reported that a compound isolated from a pepper plant killed cancer cells without harming healthy cells. Yesterday, the journal published a correction to the study (the paper’s second), which noted that “some tumors on some of the animals exceeded the maximum size … permitted by the Institutional Animal Care and Use Committee.” The tumors were only supposed to grow to a maximum of 1.5 cubic centimeters, but some reached 7 cubic centimeters, according to David Vaux, a cell biologist at the Walter and Eliza Hall Institute of Medical Research in Melbourne, Australia, who first raised concerns about the paper in 2012. (Vaux spoke to Retraction Watch, which first reported the correction.) In an editorial published yesterday, Nature calls the large tumors “a breach of experimental protocol,” one that could have caused the mice to “have experienced more pain and suffering than originally allowed for.” The journal also noted the lapse could have implications beyond the one study, saying that “cases such as this could provoke a justifiable backlash against animal research.” Nature says it will now require authors to include the maximum tumor size allowed by its institutional animal-use committee, and to state that this size was not exceeded during the experiments. The journal does say, however, that it is not retracting the paper, and that the study remains “valid and useful.”
Keyword: Animal Rights
Link ID: 21418 - Posted: 09.20.2015
By JAMES GORMAN Among the deep and intriguing phenomena that attract intense scientific interest are the birth and death of the universe, the intricacies of the human brain and the way dogs look at humans. That gaze — interpreted as loving or slavish, inquisitive or dumb — can cause dog lovers to melt, cat lovers to snicker, and researchers in animal cognition to put sausage into containers and see what wolves and dogs will do to get at it. More than one experiment has made some things pretty clear. Dogs look at humans much more than wolves do. Wolves tend to put their nose to the Tupperware and keep at it. This evidence has led to the unsurprising conclusion that dogs are more socially connected to humans and wolves more self-reliant. Once you get beyond the basics, however, agreement is elusive. In order to assess the latest bit of research, published in Biology Letters Tuesday by Monique Udell at Oregon State University, some context can be drawn from an earlier experiment that got a lot of attention more than a decade ago. In a much publicized paper in 2003, Adam Miklosi, now director of the Family Dog Project, at Eotvos Lorand University in Budapest, described work in which dogs and wolves who were raised by humans learned to open a container to get food. Then they were presented with the same container, modified so that it could not be opened. Wolves persisted, trying to solve the unsolvable problem, while dogs looked back at nearby humans. At first glance it might seem to a dog lover that the dogs were brilliant, saying, in essence, “Can I get some help here? You closed it; you open it.” But Dr. Miklosi didn’t say that. He concluded that dogs have a genetic predisposition to look at humans, which could have been the basis for the intense but often imperfect communication that dogs and people engage in. © 2015 The New York Times Company
For primary school children in China, spending an extra 45 minutes per day outside in a school activity class may reduce the risk of nearsightedness, or "myopia," according to a new study. In some parts of China, 90 per cent of high school graduates have nearsightedness, and rates are lower but increasing in Europe and the Middle East, the authors write. "There were some studies suggesting the protective effect of outdoor time in the development of myopia, but most of this evidence is from cross-sectional studies [survey] data that suggest 'association' instead of causality," said lead author Dr. Mingguang He of Sun Yat-sen University in Guangzhou. "Our study, as a randomized trial, is able to prove causality and also provide the high level of evidence to inform public policy." Intense levels of schooling and little time spent outdoors may have contributed to the epidemic rise of nearsightedness in China, he told Reuters Health by email. The researchers divided 12 primary schools in China into two groups: six schools continued their existing class schedule, while six were assigned to include an additional 40 minutes of outdoor activity at the end of each school day. Parents of children in the second group were also encouraged to engage their children in outdoor activities on the weekends. In total, almost 2,000 first-graders, with an average age of almost seven years old, were included. After three years, 30 per cent of the outdoor activity group had developed nearsightedness, compared to almost 40 per cent of kids in the control group, according to the results in JAMA. ©2015 CBC/Radio-Canada.
Link ID: 21413 - Posted: 09.16.2015