quarta-feira, 28 de maio de 2014

Nobody Is Neutral When It Comes to Net Neutrality

 

The FCC has asked for comment on whether the Internet should be reclassified as a public utility to preserve net neutrality—but the motion faces political and legal hurdles

May 27 / 2014 |By Roni Jacobson

Credit: Free Press/Flickr. Used under Creative Commons license.

Two weeks ago the Federal Communications Commission proposed new regulations that, if passed, would dramatically alter the Internet as we know it. The proposal, which would permit Internet service providers (ISPs) to set up “fast lanes” that Web sites could pay to access for speedier content delivery, has attracted widespread, vocal opposition from advocates who say that it will strangle the free flow of information around the Web.

The FCC has left itself a way out from this debacle—Chair Tom Wheeler announced that the commission invited comment on whether it should reclassify the Internet as a public utility, a move that would sidestep the need for the proposed regulations—but it is unclear if the FCC is actually willing to take it.
At issue is a concept known as net neutrality, the principle that all Internet traffic should be treated equally to preserve open access to content on the Web. Advocates of net neutrality, including Pres. Obama and hundreds of Silicon Valley companies such as Google, Facebook and Netflix, argue that allowing ISPs to charge differential rates for handling certain kinds of traffic would enable giant corporations such as Amazon to squeeze out sites that don’t have the funds to compete.

The FCC first tried to institutionalize net neutrality in 2010. But this January the U.S. Court of Appeals for the District of Columbia Circuit  struck down the regulations on the grounds that the FCC does not have the authority to require ISPs to treat all traffic equally. The new proposal attempts to codify something like net neutrality yet stay within the bounds of the district court decision that severely limits its ability to do so.

Reclassifying the Internet as a public utility, like telephone service, would shift it more firmly under the FCC’s regulatory purview. Many open-Internet advocates have been calling for this reclassification for years as a way to solve the problem, but until now the FCC has strongly resisted the proposal. “The Chairman did something very canny,” says Christopher Yoo, a professor of law, communication and information science at the University of Pennsylvania Law School. By inviting comment on the public utility question, Wheeler made it possible for approval of the fast-lane proposal move forward while preserving a “nuclear” option to establish net neutrality at some future date, if necessary. But Yoo adds that, at this point, several factors make reclassification nearly impossible, including a massive broadband lobby that will do anything to prevent it from happening because it would entail a sharp increase in regulation. So is reclassification actually feasible or is the FCC just paying lip service to net-neutrality advocates?

Classifying the Internet as a public utility would come down to a vote by the five FCC commissioners. “The problem with that is that there is a Supreme Court decision and half a dozen prior FCC decisions that cut the other way, which would severely limit the agency’s ability to move in that direction,” Yoo says.
In the Telecommunications Act of 1996, the first update to U.S. communications law since the 1930s, Congress created separate regulatory statutes for telecommunication and information services, defined as having the capability for “generating, acquiring, storing, transforming, processing, retrieving, utilizing or making available information via telecommunications.” Telecommunications services can be classified as “common carriers,” making them public utilities subject to more regulations, but information services can not be.

In six rulings since 1998 the FCC has consistently decreed that the Internet is an information, rather than a telecommunications, service. Of course, the commission is permitted to change its mind, but that becomes increasingly difficult the more that precedent has been set. The FCC would have to present its reasoning in court. To make their case successfully, it would have to describe what has changed since 2007, when the commission last ruled that broadband access via wireless networks is an information service.
Those rulings make reclassification harder to do, but they are not prohibitive in themselves. A Supreme Court decision from 2005 may pose a more significant hurdle, however. In National Cable & Telecommunications Association v. Brand X Internet Services, the Court held that Internet access is an information service and therefore not subject to the extra regulations around common carriers.
Supreme Court Justice Clarence Thomas noted in his opinion that, because the Telecommunications Act provisions were “vague,” the Court would defer to the FCC’s interpretation of the statute defining what a telecommunications service is, even in the face of past precedent—unless the precedent had determined that the statute’s meaning was unambiguous.

That may be the case. According to Yoo, “The Internet simply doesn’t meet the definition” for a telecom service. As outlined in the statute, a telecom service transports data to an end point chosen by the user without tranforming it. For one thing, Yoo says, the Internet has too much data processing and storage going on, precluding it from being classified as a telecom service. “Points specified by the user” can be problematic as well, Yoo adds. For example, if a person in New York City points his or her Web browser to Google.com, that’s the site that will appear. But if that person then flies to Tokyo and types “Google.com” into a browser, it will be redirected to Google.co.jp. Between the Supreme Court decision and the statute, “as a legal matter I think that it’s going to be almost impossible,” to reclassify the Internet, Yoo says.
Philip J. Weiser, dean of the University of Colorado Law School, agrees that reclassification could be “hard.” He notes, “The second issue is there is a lot of legacy regulation that the FCC would presumably not want to apply.” If the Internet were to be classified as a common carrier, the FCC would need to make exceptions for it and would then have to justify in court why it is treating the Internet differently from other services in the same category.

Not everyone thinks reclassification would be prohibitively difficult, however. Tim Wu, the Columbia Law School professor who coined the term “net neutrality” in 2003, calls Yoo’s legal assessment “flat out wrong.” For one thing, in the 1990s when Internet access was transmitted over telephone lines it was classified as a Title II, or a telecommunications common carrier, “so it would actually be a return to an older approach,” Wu says. “Second, the Supreme Court made it clear in the Brand X decision that Title II classification was obvious and easy.” The problem with reclassification is not a legal one: “It’s political,” Wu says.

At least one former FCC official agrees. Michael Copps, a commissioner from 2001 to 2011, wrote a blog post calling for reclassification and described the process as “pretty simple.” He wrote: “All it requires is an FCC big enough to own up to its previous mistakes and courageous enough to put our communications future back on track," citing court decisions that have granted the FCC considerable deference in its interpretation of the statute.

However easy or hard it would be to make the change internally, “I guarantee it would be challenged in court,” Yoo says, by Internet service providers such as Comcast and Verizon. The proposal also faces significant opposition from Republicans in Congress sympathetic to ISP claims that reclassification would impose onerous regulations that would stifle innovation and hurt jobs.
One thing is clear: Whether the forces against making the Internet a public utility are legal or political, the proposal faces an uphill battle either way.

Precision-guided epidurals, better blood monitors for better care

 


The march of modern medicine is often driven by revolutions in medical imaging. When technology advances, doctors are better able to peer deeply into human tissues, and thus able to detect, diagnose and treat human diseases more effectively.

Now, researchers have taken an established imaging technology called "optical coherence tomography," or OCT, and integrated it with other instruments to bring about the next revolution in imaging by helping doctors provide safer, less painful and more effective care for women in labor and people with diabetic retinopathy and glaucoma. Their research will be presented at CLEO: 2014 being held June 8-13 in San Jose, California, USA.

OCT uses scattered "echoes" or reflections of light waves to produce high-resolution images of biological tissues, similar to ultrasound imaging but with one order of magnitude improvement in the resolution. Ophthalmologists have been using OCT to examine the retina for years. More recently, OCT has been applied to a number of other clinical specialties, including oncology for early cancer detection and staging in the gastrointestinal and urogenital tract as well as in cardiology, where it is used to study the formation of plaques in coronary arteries in situ.

Precision-guided epidurals

Bioengineer Yu Chen of the University of Maryland and his colleagues have developed a way to integrate an OCT device with an 18-gauge epidural needle. Epidural administration, Chen notes, is traditionally done blindly, using anatomical landmarks. But the team's newly miniaturized handheld device lets anesthesiologists see tissue from the perspective of the tip of the epidural needle, which could help doctors to deliver spinal anesthetic to patients with less pain and fewer complications.

"Due to lack of visual feedback, failure rates are often high, leading to multiple needle insertions," he says. Side effects of these failures can include trauma to blood vessels and punctures in the dura, the outermost membrane surrounding the brain and spinal cord.

"An OCT forward-imaging probe can provide anesthesiologists with real-time visualization of the microarchitecture of tissues and important landmarks, and thus could significantly improve the accuracy and the safety of the needle-based procedure," Chen says.

The researchers have been successful in testing needle-guidance experiments on pig swine samples and hope to conduct a pre-clinical study of the device within the next year.

Presentation AM2O.3, titled "Real-time Epidural Anesthesia Guidance Using Optical Coherence Tomography Needle Probe will take place Monday, June 9, at 11:15 a.m. in Salon V & VI of the San Jose Convention Marriott.

Better blood monitors

A team at the University of California, Davis, led by Biomedical Engineer Vivek Srinivasan has shown how OCT can simultaneously measure blood flow and blood oxygenation in vessels, without the need for contrast agents.

Like ultrasound, OCT can provide structural information, but it can also be used to determine flow rates and for angiography, visualizing the interior of blood vessels, says Shau Poh Chong, a postdoctoral researcher in the Srinivasan lab.

"Conventional pulse oximetry measures oxygen saturation using transmitted light," Chong says. "Performing these measurements quantitatively with reflected light has traditionally been difficult due to the unknown distance traveled by the light through scattering tissue."

OCT directly determines the distance that light travels. Until now, however, it was difficult to use OCT to measure oxygen saturation in blood, due to additional modeling errors introduced by light scattering. At visible wavelengths, scattering is much lower relative to blood absorption than at infrared wavelengths, where OCT is typically performed. The OCT system developed in the Srinivasan lab uses broadband visible light to measure the amounts of both oxygenated and deoxygenated hemoglobin, the oxygen-carrying protein of blood, thus revealing oxygen saturation levels. In addition, the team developed new methods to further reduce modeling errors caused by light scattering.

"The broad set of measurements provided by the system, including angiography, oximetry and red blood cell flow rates enables the direct assessment of tissue oxygen metabolism, which is essential for understanding the evolution of oxygen supply and demand in numerous disease models," Chong says. "In the future, these techniques could be applied to study metabolic changes in diseases that affect the human retina, such as diabetic retinopathy and glaucoma."


Story Source:

The above story is based on materials provided by The Optical Society. Note: Materials may be edited for content and length.

New method discovered to protect against chemical weapons

 


Nerve gas decontamination.

Researchers at Oregon State University have discovered that some compounds called polyoxoniobates can degrade and decontaminate nerve agents such as the deadly sarin gas, and have other characteristics that may make them ideal for protective suits, masks or other clothing.

The use of polyoxoniobates for this purpose had never before been demonstrated, scientists said, and the discovery could have important implications for both military and civilian protection. A United Nations report last year concluded that sarin gas was used in the conflict in Syria.

The study findings were just published in the European Journal of Inorganic Chemistry.

Some other compounds exist that can decontaminate nerve gases, researchers said, but they are organic, unstable, degraded by sunlight and have other characteristics that make them undesirable for protective clothing -- or they are inorganic, but cannot be used on fabrics or surfaces.

By contrast, the polyoxoniobates are inorganic, do not degrade in normal environmental conditions, dissolve easily and it should be able to incorporate them onto surfaces, fabrics and other material.

"This is a fundamental new understanding of what these compounds can do," said May Nyman, an associate professor in the Department of Chemistry in the OSU College of Science. "As stable, inorganic compounds they have an important potential to decontaminate and protect against these deadly nerve gases."

As a chemical group, polyoxoniobates have been known of since the mid-1900s, Nyman said, but a detailed investigation of their complex chemistry has revealed this new potential. Besides protection against nerve gas, she said, their chemistry might allow them to function as a catalyst that could absorb carbon dioxide and find use in carbon sequestration at fossil-fuel power plants -- but little has been done yet to explore that potential.

A new method to protect against nerve agents could be significant. These organofluorophosphate compounds can be inhaled or absorbed through the skin, and in military use are considered weapons of mass destruction. They can be lethal even at very small levels of exposure.

"In continued work we hope to incorporate the protective compounds onto surfaces or fabrics and explore their function," Nyman said. "They could form the basis for an improved type of gas mask or other protection. We would also need to test the material's ability to withstand very arid environments, extreme heat or other conditions."

A goal will be materials that are durable, high performing and retain a high level of protection against nerve agents such as sarin and soman gas even in harsh environmental conditions, researchers said.

The OSU research demonstrated the ability of polyoxoniobates to neutralize both actual and simulated nerve agents. Testing against actual nerve agents was done at the Edgewood Chemical Biological Center, a U.S. Army facility designed for that purpose.

OSU has collaborated on this research with Sandia National Laboratories and the U.S. Army. The work at Edgewood was supported by the Defense Threat Reduction Agency, a unit of the U.S. Department of Defense.


Story Source:

The above story is based on materials provided by Oregon State University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Mark K. Kinnan, William R. Creasy, Lauren B. Fullmer, Heidi L. Schreuder-Gibson, May Nyman. Nerve Agent Degradation with Polyoxoniobates. European Journal of Inorganic Chemistry, 2014; 2014 (14): 2361 DOI: 10.1002/ejic.201400016

X-ray dark-field radiography provides detailed imaging of lung diseases

 


Scientists at the Helmholtz Zentrum München (HMGU) working in cooperation with the Ludwig-Maximilians-Universität Hospital (KUM) and the Technischen Universität München (TUM) tested for the first time X-ray dark-field radiography on a living organism for the diagnosis of lung disease. This enables highly detailed images of the lung to be produced. As the team reports in the Investigative Radiology journal, this method shows promise in detecting diseases such as pulmonary emphysema at an earlier stage, than it is currently available.

Conventional radiographic procedures generate images based on the absorption of X-rays as they pass through the tissue. The newly developed technique of X-ray dark-field radiography uses new technology to monitor wave changes during tissue transmission to create higher resolution images.

Detailed images With the aid of this new technique, the team from the HMGU, KUM and TUM around Dr. Ali Önder Yildirim and Prof. Oliver Eickelberg of the Comprehensive Pneumology Center (CPC), which is one of the centers of the German Center for Lung Research (DZL), achieved detailed images of soft tissue.

The study was conducted in cooperation with the Cluster of Excellence Munich-Centre for Advanced Photonics (MAP). The scientists used a small-animal scanner developed by Prof. Franz Pfeifer at the TUM to test X-ray dark-field radiography on a living organism. For their investigations, they evaluated and compared images of the lung. "With X-ray dark-field radiography, structural changes in the lung tissue are visible at an early stage," Dr. Yildirim from the CPC/HMGU says.

Early detection of lung disease "Early detection of changes in the lung tissue will improve the diagnosis of lung diseases," explains Dr. Felix Meinel from the Institute of Clinical Radiology at the KUM. The clinical application, in particular the diagnosis of lung diseases such as pulmonary emphysema or pulmonary fibrosis, will now be tested in further studies.

Lung diseases are among the leading causes of death worldwide. Genetics, lifestyle and environmental factors all play a role in their development. The work of the Helmholtz Zentrum München, the German Research Center for Environmental Health, focuses on the major common diseases with the aim of developing new approaches to their diagnosis, treatment and prevention.


Story Source:

The above story is based on materials provided by Helmholtz Zentrum Muenchen - German Research Centre for Environmental Health. Note: Materials may be edited for content and length.


Journal Reference:

  1. M. Bech, A. Tapfer, A. Velroyen, A. Yaroshenko, B. Pauwels, J. Hostens, P. Bruyndonckx, A. Sasov, F. Pfeiffer. In-vivo dark-field and phase-contrast x-ray imaging. Scientific Reports, 2013; 3 DOI: 10.1038/srep03209

Aircraft fuel consumption can be reduced by 15 per cent

 


The aircraft engine concept open rotor can enable a 15 per cent reduction to aircraft fuel consumption.

Two aircraft engine concepts, geared turbofan and open rotor, can enable a significant reduction to aircraft fuel consumption. With open rotor, the potential reduction is 15 per cent. These are the findings of Linda Larsson at Chalmers University of Technology, who has analysed and evaluated the two concepts.

The average annual increase in passenger kilometres travelled by air has been 5.8% over the last 40 years, and fuel sales have increased by 2.2 per cent annually during the same period. New technological solutions are needed if aviation is to reduce its impact on the climate.

Linda Larsson recently defended her doctoral thesis at Chalmers University of Technology, where she has been studying two promising aircraft engine concepts.

"They are called geared turbofan and open rotor. The two concepts have a propulsive efficiency; in other words, the energy generated by the core engine can be efficiently converted into thrust," she says.

What differentiates a geared turbofan from a regular turbofan is that the large fan at the front of the engine operates at a lower speed than the turbine that drives it. There is a gearbox between the turbine and fan that reduces the number of revolutions, which enables a lighter turbine and a higher turbine efficiency.

An open rotor engine generates most of the thrust from two counter-rotating propellers instead of a ducted fan. This enables a larger engine diameter and thus a higher propulsive efficiency, without resulting in excessively large and heavy engine nacelle.

"Both of the concepts demonstrated very good potential in terms of reducing fuel consumption: geared turbofan by up to 4 per cent and open rotor by up to 15 per cent. Naturally, though, the technology has to be developed and implemented," says Linda Larsson.

The open rotor concept was studied in the 1980s after the oil crisis and resulting fuel price hikes, and it was apparent already then that it worked. However, fuel prices dropped and the technology lost its appeal. It is now starting to get noticed again.

"The cost of fuel is one of the biggest costs faced by airlines, and there are also obvious environmental reasons and political incentives to reduce fuel consumption and emissions. A great deal of research is being conducted on the open rotor concept right now, and I believe the concept could be in place around 2030," says Linda Larsson.

Her study of the open rotor concept has been conducted on a small aircraft that is a possibility for the future; the small aircraft would operate short routes such as between Gothenburg and Berlin. A method to represent propeller performance was needed in order to do the calculations. Models of this type already exist in the industry but only for specific designs, which means they are not generally accessible. Linda Larsson has instead produced a method that can be used freely and widely and that can be re-scaled as more data becomes available.

The open rotor concept will thus be possible a few years down the road, but geared turbofan applications are not that far away.

"I have studied how great the potential of the architecture itself is. I have not studied any specific models from manufacturers, but aircraft using the geared turbofan concept will be available in the market as early as next year," says Linda Larsson.


Story Source:

The above story is based on materials provided by Chalmers University of Technology. Note: Materials may be edited for content and length.

Europe approves Takeda drug for ulcerative colitis, Crohn's disease

 

(Reuters) - The European Commission has approved the sale of Takeda Pharmaceutical Co Ltd's Entyvio drug to treat patients with ulcerative colitis and Crohn's disease, Japan's biggest drugmaker said on Wednesday.

Entyvio, the trade name for vedolizumab, is one of several major drugs in Takeda's pipeline, and Chief Financial Officer Francois-Xavier Roger has said it has the potential to be a blockbuster as it enters the global market.

Ulcerative colitis and Crohn's disease are the two most common types of inflammatory bowel disease, affecting more than 4 million people worldwide, including 2.2 million in Europe, Takeda said in a statement.

The drug has been cleared for sale in the European Union, Norway, Iceland and Liechtenstein, Takeda said, after a similar approval by the U.S. Food and Drug Administration last week.

Shares in Takeda were up 0.6 percent on Wednesday morning, slightly outperforming the broader Tokyo market's 0.3 percent gain.

(Reporting by Chang-Ran Kim; Editing by Stephen Coates)

Novo Nordisk changes strategy in Germany, launches diabetes drug

 

(Reuters) - Danish drugmaker Novo Nordisk, the world's biggest insulin producer, said on Wednesday it had decided to launch its diabetes drug Tresiba in Germany on May 1 after seeing signs of a more favourable pricing situation there.

Tresiba was approved in the European Union last year, but despite Germany being Europe's biggest market Novo hesitated to market Tresiba because German authorities have been reluctant to support new and more expensive drugs.

"We've recently observed that Germany has started to reward new innovative drugs," Jakob Riis, executive vice president of Marketing & Medical Affairs in Novo Nordisk, told Reuters.

In 2011 Germany started comparing the benefits of newly approved drugs with those of existing treatments and gave medical insurers more bargaining power in price talks with drug makers.

That prompted a number of companies to refrain from launching products in Germany, including Boehringer Ingelheim and partner Eli Lilly, who chose not to sell diabetes drug Trajenta there.

"The bar may have been moved slightly down in Germany," Riis said.

In Germany, he said, drugmakers can initially set the price they want for new products and get a subsidy at the same time. Then, within a year, German authorities initiate an assessment process to find out if the price or subsidy should change.

"Within 12 months, we must agree on a price otherwise we will leave the market," Riis said.

In December 2013 Bristol-Myers Squibb and AstraZeneca said they would pull a new diabetes drug from the German market because they had failed to agree on a price with a body of medical insurers.

While the EU approved Tresiba, U.S. regulators unexpectedly refused to approve it in February 2013 until Novo Nordisk conducted extra tests over potential heart risks, dealing a major blow to one of the company's main products as well as to its share price.

(Editing by Susan Fenton)

Uma piada ao frigir dos ovos

 

O gaucho de 1,90m de altura, 100 Kg de peso, entra em um bar e pede ao barman: Um copo bem grande de pinga da boa, 200 ml. “Barbaridade, tchê,   “Bebo assim porque na minha terra só tem macho !”.  Ao lado dele, quieto, um mineiro enrolando seu cigarrinho de palha.  Traga mais uma e coloca no copo pimenta malagueta, e pimenta do reino, tchê !  Ah, na minha terra só tem macho !  E o mineiro ouvindo, calado.

Depois de 3 copaços de pinga com pimenta, e afirmando aos brados que na sua terra só tinha machos, perguntou ao mineiro: E na tua terra, tchê, o que tem lá? 

O mineiro soltou uma baforada do seu cigarrinho e respondeu:

Na minha terra, graças a Deus, temos machos e fêmeas, e nos damos muito bem !

sid_melo_blogreen

 

 

CONGRATULATIONS SID_MELO_BLOGREEN : ONE THOUSAND POSTS.

 

images

Intermediaries increase corruption

 


An experimental study in which the Universidad Carlos III (UC3M) took part analysed the interaction between public officials and citizens and found that the presence of intermediaries significantly increases corruption.

In reality, an intermediary participates in many, if not most, cases of corruption. However there has been very scarce empirical evidence that illuminates their role in these situations. This is what a researcher at UC3M has analyzed in collaboration with scientists from Florida State University and Southern Methodist University, in Texas (both in the United States). The results of their study, recently published in Experimental Economics, confirm their suspicions: "Our work showed that the number of persons involved in cases of corruption increases significantly when there are intermediaries," states one of its authors, Mikhail Drugov, a professor in the UC3M Department of Economics.

To carry out the study, the researchers designed a laboratory experiment, given that analyzing these situations in real life is impossible. "Corrupt individuals, particularly, the officials would never participate, because it would be potentially dangerous for them," remarked the experts. For this reason, what they did was to recreate a minor case of corruption in which a citizen must decide whether to offer a public official a bribe in exchange for moving up a hospital stay or receiving preferential treatment when arranging an appointment, while the public official decides whether or not to accept this dishonest proposal and the amount for which they would do it. What the researchers did afterwards was to compare the results that are obtained when this negotiation is direct and when there is an intermediary who plays a passive role of simply passing the information and money. "Sincerely," disclosed Drugov, "we did not expect that this type of intermediary would have any influence, but our results are there: their mere presence increases corruption."

This might happen, among other reasons, because responsibility for actions is diluted. Even in countries with high rates of corruption, individuals normally have an ethic which makes them reluctant to participate in this sort of immoral action. However, note the researchers, in different contexts, it has been found that the existence of intermediaries reduces the feeling of guilt caused by bad actions. "Even in the case of intermediaries that are completely passive, negative feelings associated with corruption are reduced, which contributes towards more corruption," they note.

The results of the study might be useful for designing policies related to the use of intermediaries in the supply of goods and public services. "Should the figure of the intermediary even be prohibited in these contexts? It is necessary to carefully examine the advantages and disadvantages of such a measure, because there are still many things to clarify in this respect," said Drugov. For example, it would also be necessary to analyze the benefits that the use of honest intermediaries brings to the system.


Story Source:

The above story is based on materials provided by Carlos III University of Madrid. Note: Materials may be edited for content and length.


Journal Reference:

  1. Mikhail Drugov, John Hamman, Danila Serra. Intermediaries in corruption: an experiment. Experimental Economics, 2013; 17 (1): 78 DOI: 10.1007/s10683-013-9358-8

Sperm cells are extremely efficient at swimming against a current: How sperm travel long distances, through difficult terrain, to reach an egg

 

May 27 / 2014

Massachusetts Institute of Technology

Like salmon traveling upstream to spawn, sperm cells are extremely efficient at swimming against the current, according to new research. The discovery may help us to understand how some sperm travel such long distances, through difficult terrain, to reach and fertilize an egg. Of the hundreds of millions of sperm cells that begin the journey up the oviducts, only a few hardy travelers will ever reach their destination. Not only do the cells have to swim in the right direction over distances that are around 1,000 times their own length, but they are exposed to different chemicals and currents along the way.


Superimposed photographs of a human sperm cell swimming upstream along the wall of a microfluidic channel, with overlaid virtual tracer particles indicating the flow direction.

Like salmon traveling upstream to spawn, sperm cells are extremely efficient at swimming against the current, according to research to be published this week.

The discovery, to be published in the journal eLife by researchers at MIT and Cambridge University, may help us to understand how some sperm travel such long distances, through difficult terrain, to reach and fertilize an egg.

Of the hundreds of millions of sperm cells that begin the journey up the oviducts, only a few hardy travelers will ever reach their destination. Not only do the cells have to swim in the right direction over distances that are around 1,000 times their own length, but they are exposed to different chemicals and currents along the way.

While we know that sperm cells can "smell" chemicals given off by the egg once they get very close to it, this does not explain how they navigate for the majority of their journey, says Jörn Dunkel, an assistant professor of mathematics at MIT, and a member of the research team.

"We wanted to know which physical mechanisms could be responsible for navigation," says Dunkel, who carried out the research alongside Vasily Kantsler of the Skolkovo Institute of Science and Technology and the University of Warwick (and currently visiting at MIT); Raymond E. Goldstein of Cambridge; and Martyn Blayney of the Bourn Hall Clinic in the U.K. "If you think of salmon, for example, they can swim against the stream, and the question was whether something similar could really be confirmed for human sperm cells."

Microchannels in lieu of oviducts

However, observing sperm cells swimming within the human body itself is no easy task. So in a bid to understand what the cells are capable of, the researchers instead built a series of artificial microchannels of different sizes and shapes, into which they inserted the sperm. They were then able to modify the flow of fluid through the tubes, to investigate how the cells responded to different current speeds.

They discovered that at certain flow speeds, the sperm cells were able to swim very efficiently upstream. "We found that if you create the right flow velocities, you can observe them swimming upstream for several minutes," Dunkel says. "The mechanism is very robust."

What's more, the researchers were also surprised to observe that the sperm were not swimming in a straight line upstream, but in a spiraling motion, along the walls of the channel. The sperm cells react to the difference in the speed of current near the walls of the chamber -- where the fluid is attracted to the surface, and is therefore at its slowest -- and the free-flowing center of the tube, Dunkel says.

If biologists are able to observe similar fluid-flow speeds within the oviduct, it could help confirm whether sperm cells are indeed using this mechanism to navigate through the body, he says.

Possible advances in artificial insemination

Not only would this improve our understanding of human reproduction, but it could also one day allow us to design new diagnostic tools and more efficient artificial-insemination techniques, the researchers claim. Reproduction specialists could take sperm samples and artificially recreate the conditions within the body to identify the cells that are the best swimmers, in a bid to preselect those most likely to succeed, Dunkel says.

The researchers can also experiment with different fluid viscosities within the microchannels, to determine which result in the strongest upstream swimming effect, he says. "So the idea would be to fine-tune the properties of the fluid medium that the sperm cells are contained in, before you insert it into the body, so that you know the cells can achieve optimal upstream swimming."

In the meantime, the researchers plan to begin investigating whether sperm cells can work together to reach the egg. "It is a commonly held belief that there is competition between sperm cells, with the fittest reaching the egg first," Dunkel says. "But recent studies by our team and others show that sperm practically always accumulate at the surface of a tube, and you can end up with a high local concentration of sperm cells, so there could actually be cooperation among these cells that allows them to swim faster collectively."

The research was supported by the European Research Council.


Story Source:

The above story is based on materials provided by Massachusetts Institute of Technology. The original article was written by Helen Knight. Note: Materials may be edited for content and length.


Journal Reference:

  1. Vasily Kantsler, Jörn Dunkel, Martyn Blayney, Raymond E Goldstein. Rheotaxis facilitates upstream navigation of mammalian sperm cells Mammalian sperm subject to shear flow swim in upstream spirals along the walls bounding such flows, thereby demonstrating a robust mechanism for upstream navigation to the ovum. eLife, 2014 DOI: 10.7554/eLife.02403

Why don’t the highly educated smoke? Families kids grow up in play important role

 


It's well established that adults with college degrees are much less likely to smoke than adults with less education, but the reasons for this inequality are unclear.

It's well established that adults with college degrees are much less likely to smoke than adults with less education, but the reasons for this inequality are unclear. A new Yale study shows that the links between smoking and education in adulthood are in fact explained by characteristics and choices made in adolescence. The study appears in the journal Social Science Research.

The study uses data collected over 14 years to link the smoking and educational histories of adults ages 26 to 29 to their experiences in adolescence. It turns out that differences in smoking by the level of education the person will eventually complete appear as early as age 12, long before that education is obtained, writes author Vida Maralani, assistant professor of sociology at Yale.

Maralani's study shows that educational disparities in adult smoking are anchored to experiences from early in life. School policies, peers, and expectations about the future measured at ages 13 to 15 predict smoking at ages 26 to 29. "This means that in order to reduce educational inequalities in smoking, we have to figure out exactly which characteristics before age 12 predict that a child will both not take up smoking and stay committed to school," Maralani said.

Maralani also shows that commonly assumed explanations such as college aspirations and analytical skills do not explain the links between smoking and education in adulthood. Instead, Maralani argues, the families in which kids grow up and children's non-cognitive skills may matter far more than realized in explaining the robust association between education and smoking in adulthood.

Maralani writes, "Overall, educational inequalities in adult smoking are better understood as a bundling of advantageous statuses that develops in childhood, rather than the effect of education producing better health."

Funding for this study was provided by the Robert Wood Johnson Foundation Health & Society Scholars program.


Story Source:

The above story is based on materials provided by Yale University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Vida Maralani. Understanding the links between education and smoking. Social Science Research, 2014; DOI: 10.1016/j.ssresearch.2014.05.007

Making research findings freely available is an essential aid to medical progress, experts say

 

May 27 / 2014

Medical researchers explore how open access publications could help moderate and reduce the vast waste of global medical research. Subscription-based academic journals make money by through copyrights assigned by authors to publishers who lock the articles behind paywalls. Open access models, in which journals charge a publication fee and then make research and related content fully and immediately available to all, stand to aid the dissemination of knowledge and to improve its quality, experts say.


In a PLOS Medicine guest editorial, Paul Glasziou, Professor of Evidence-Based Medicine at Bond University in Australia, explores how open access publications could help moderate and reduce the vast waste of global medical research.

Continuing on from his previous work, which highlighted how most of the world's expenditure on medical research was thrown away, Glasziou outlines how bad the situation is and suggests how it might be improved. Subscription-based academic journals make money by through copyrights assigned by authors to publishers who lock the articles behind paywalls. Open access models, in which journals charge a publication fee and then make research and related content fully and immediately available to all, stand to aid the dissemination of knowledge and to improve its quality.

"The waste sounds bad but the reality is worse," writes Glasziou. "The estimate that '85% of research' is wasted referred only to activities prior to the point of publication." After that, he points out, other barriers create post-publication waste. Despite all the effort and attention put into funding medical research through charitable and government programmes, publishing models that restrict access to research outcomes mean that profit comes at the expense of human health. The systems that encourage poor research and poor communication of research findings may seem like dry subjects but the waste they cause costs lives. Charities and governments should ensure the work they fund and authorise is published in an open access manner, thereby making it far more effective.

"To get full value from research investment," Glasziou concludes, "we need to reduce both the annual $100 billion of pre-publication (research production) waste and the unquantified cost of post-publication (research dissemination) barriers … If over a hundred billion dollars of medical research money were being wasted by corruption, the public and political outcry would be overwhelming. That resources of this magnitude are being wasted through incompetence and inattention should be seen as a similar scandal. Badly designed and poorly thought through systems of research and dissemination subtract massively from global human health."


Story Source:

The above story is based on materials provided by PLOS. Note: Materials may be edited for content and length.


Journal Reference:

  1. Paul Glasziou. The Role of Open Access in Reducing Waste in Medical Research. PLoS Medicine, 2014; 11 (5): e1001651 DOI: 10.1371/journal.pmed.1001651

Learning early in life may help keep brain cells alive: Brain cells survive in young who master a task

 


The power of the young mind (photo illustration). New research in young rats suggests that using your brain may help brain cells survive and could impact how the brain functions after puberty.

Using your brain -- particularly during adolescence -- may help brain cells survive and could impact how the brain functions after puberty.

According to a recently published study in Frontiers in Neuroscience, Rutgers behavioral and systems neuroscientist Tracey Shors, who co-authored the study, found that the newborn brain cells in young rats that were successful at learning survived while the same brain cells in animals that didn't master the task died quickly.

"In those that didn't learn, three weeks after the new brain cells were made, nearly one-half of them were no longer there," said Shors, professor in the Department of Psychology and Center for Collaborative Neuroscience at Rutgers. "But in those that learned, it was hard to count. There were so many that were still alive."

The study is important, Shors says, because it suggests that the massive proliferation of new brain cells most likely helps young animals leave the protectiveness of their mothers and face dangers, challenges and opportunities of adulthood.

Scientists have known for years that the neurons in adult rats, which are significant but fewer in numbers than during puberty, could be saved with learning, but they did not know if this would be the case for young rats that produce two to four times more neurons than adult animals.

By examining the hippocampus -- a portion of the brain associated with the process of learning -- after the rats learned to associate a sound with a motor response, scientists found that the new brain cells injected with dye a few weeks earlier were still alive in those that had learned the task while the cells in those who had failed did not survive.

"It's not that learning makes more cells," says Shors. "It's that the process of learning keeps new cells alive that are already present at the time of the learning experience."

Since the process of producing new brain cells on a cellular level is similar in animals, including humans, Shors says ensuring that adolescent children learn at optimal levels is critical.

"What it has shown me, especially as an educator, is how difficult it is to achieve optimal learning for our students. You don't want the material to be too easy to learn and yet still have it too difficult where the student doesn't learn and gives up," Shors says.

So, what does this mean for the 12-year-old adolescent boy or girl?

While scientists can't measure individual brain cells in humans, Shors says this study, on the cellular level, provides a look at what is happening in the adolescent brain and provides a window into the amazing ability the brain has to reorganize itself and form new neural connections at such a transformational time in our lives.

"Adolescents are trying to figure out who they are now, who they want to be when they grow up and are at school in a learning environment all day long," says Shors. "The brain has to have a lot of strength to respond to all those experiences."


Story Source:

The above story is based on materials provided by Rutgers University. The original article was written by Robin Lally. Note: Materials may be edited for content and length.


Journal Reference:

  1. Daniel M. Curlik, Gina DiFeo, Tracey J. Shors. Preparing for adulthood: thousands upon thousands of new cells are born in the hippocampus during puberty, and most survive with effortful learning. Frontiers in Neuroscience, 2014; 8 DOI: 10.3389/fnins.2014.00070

600 year old mystery manuscript decoded by University of Bedfordshire professor

 

Fri 14th February, 2014

AN award-winning professor from the University has followed in the footsteps of Indiana Jones by cracking the code of a 600 year old manuscript, deemed as ‘the most mysterious’ document in the world.

Stephen Bax, Professor of Applied Linguistics, has just become the first professional linguist to crack the code of the Voynich manuscript using an analytical approach.

The world-renowned manuscript is full of illustrations of exotic plants, stars, and mysterious human figures, as well as many pages written in an unknown text.

Up until now the 15th century cryptic work has baffled scholars, cryptographers and codebreakers who have failed to read a single letter of the script or any word of the text.

Over time it has attained an infamous reputation, even featuring in the latest hit computer game Assassin’s Creed, as well as in the Indiana Jones novels, when Indiana decoded the Voynich and used it to find the ‘Philosopher's Stone’.

However in reality no one has come close to revealing the Voynich’s true messages.

Many grand theories have been proposed. Some suggest it was the work of Leonardo da Vinci as a boy, or secret Cathars, or the lost tribe of Israel, or most recently Aztecs … some have even proclaimed it was done by aliens!

Professor Bax however has begun to unlock the mystery meanings of the Voynich manuscript using his wide knowledge of mediaeval manuscripts and his familiarity with Semitic languages such as Arabic. Using careful linguistic analysis he is working on the script letter by letter.

“I hit on the idea of identifying proper names in the text, following historic approaches which successfully deciphered Egyptian hieroglyphs and other mystery scripts, and I then used those names to work out part of the script,” explained Professor Bax.

“The manuscript has a lot of illustrations of stars and plants. I was able to identify some of these, with their names, by looking at mediaeval herbal manuscripts in Arabic and other languages, and I then made a start on a decoding, with some exciting results.”

Among the words he has identified is the term for Taurus, alongside a picture of seven stars which seem to be the Pleiades, and also the word KANTAIRON alongside a picture of the plant Centaury, a known mediaeval herb, as well as a number of other plants.

Although Professor Bax’s decoding is still only partial, it has generated a lot of excitement in the world of codebreaking and linguistics because it could prove a crucial breakthrough for an eventual full decipherment.

“My aim in reporting on my findings at this stage is to encourage other linguists to work with me to decode the whole script using the same approach, though it still won’t be easy. That way we can finally understand what the mysterious authors were trying to tell us,” he added.

“But already my research shows conclusively that the manuscript is not a hoax, as some have claimed, and is probably a treatise on nature, perhaps in a Near Eastern or Asian language.”

Find out more about his work at the University's Centre for Research in English Language Learning and Assessment (CRELLA) and also on his personal website www.stephenbax.net

Professor Bax, who was recently awarded the 2014 TESOL International Distinguished Researcher Award for his work on eye-tracking and reading, will discuss this and other research at his inaugural professional lecture at the University’s Luton campus on Tuesday 25 February at 6pm.

For a complimentary ticket visit: sbax.eventbrite.com

 

600 year old mystery manuscript decoded by University of Bedfordshire professor - beds.ac.uk 2014-05-28 10-04-26

How Animals See the World

 

See through the eyes of cats, birds, fish, and snakes.

By Elizabeth Preston Photo by Dr. Klaus Schmitt March 20, 2014

Some animals, including your pets, may be partially colorblind, and yet certain aspects of their vision are superior to your own. Living creatures’ visual perception of the surrounding world depends on how their eyes process light. Humans are trichromats—meaning that our eyes have three types of the photoreceptors known as cone cells, which are sensitive to the colors red, green, and blue. A different type of photoreceptors, called rods, detect small amounts of light; this allows us to see in the dark. Animals process light differently—some creatures have only two types of photoreceptors, which renders them partially colorblind, some have four, which enables them to see ultraviolet light, and others can detect polarized light, meaning light waves that are oscillating in the same plane.

“None of us can resist thinking that we can imagine what another animal is thinking,” says Thomas Cronin, a professor at the University of Maryland who studies visual physiology. But while guessing animals’ thoughts is a fantasy, looking at the world through their eyes is possible.

Drag the slider to the right to see an animal’s view; to the left to see a person’s view.

Cat

“We will never know what a cat would experience,” says Dan-Eric Nilsson, a zoology professor at the University of Lund in Sweden and coauthor of the book Animal Eyes. But we can come close to seeing what it sees. Unlike humans, cats are dichromats; they have only two kinds of cones in their retinas. They see similarly to humans with red-green colorblindness, Nilsson says. To model a cat’s vision, one has to pool everything that’s red or green into one color.

The cat’s eyesight has a lower resolution than our own, which means it sees objects slightly blurrier than we do. Human vision is among the sharpest of all animals, thanks to densely packed cones at the center of our retina. Nilsson says cats’ daylight vision is about six times blurrier than ours, which is not depicted in the image above. However, cats have more rods than humans, so by moonlight, the advantage is reversed. 

Bee

Bees are trichromats like humans. But instead of red, green, and blue, their three types of photoreceptors are sensitive to yellow, blue, and ultraviolet light. The ability to see ultraviolet light lets bees spot patterns on flower petals that guide them to nectar. In fact, Nilsson says, bees perceive so much of the ultraviolet range that “they could potentially see more than one color of ultraviolet.”

Unlike human eyes, which have only one lens, bees have compound eyes composed of thousands of lenses that form a soccer-ball-like surface; each lens produces one “pixel” in bees’ vision. That vision mechanism comes at a price—bees’ eyes have extremely low resolution, so their vision is very blurred. Nilsson calls this design “the most stupid way of using the space available for an eye.” If humans had compound eyes that performed as well as our real ones, he says, they’d each have to be as wide as a hula hoop.

This image doesn’t show the fuzziness of a bee’s eyesight—if it did, there wouldn’t be much for us to look at. But the photograph does capture the ultraviolet vision that we lack.

Bird

Unlike humans, birds are tetrachromats. Their four types of cone cells let them see red, green, blue, and ultraviolet together. A few birds of prey have sharper vision than humans, Nilsson says. A large eagle sees with about 2.5 times the resolution that we do.

If Nilsson could truly get inside the head of another animal, “birds would be interesting,” he says. But we can neither sharpen our resolution past human limits nor see ultraviolet light—we don’t have the photoreceptors and brain neurons to make it happen. We can use binoculars to see the distant detail that an eagle would discern, and cameras that convert ultraviolet light to a color visible to our eye, but without such technology “there’s no way of allowing a human to really experience what the world would be like to a big eagle,” Nilsson says.

Rattlesnake

Rattlesnakes have low-resolution color vision during the day and plenty of rod cells for a boost at night. But what sets rattlesnakes apart is their ability to sense infrared light. Similarly to vipers, pythons, and boas, the rattlesnake has special sensory tools called pit organs—a pair of holes on either side of the snout between the eye and the nostril. Suspended in each pit is a thin membrane that detects heat, says David Julius, a physiology professor at the University of California, San Francisco. Julius discovered that a neural receptor, TRPA1, present in the nerve cells connected to this membrane is responsible for snakes’ ability to transform infrared light into nerve signals. In humans, the same receptor triggers our pain response to certain spicy foods such as wasabi and mustard. But in snakes, it responds to the heat of nearby prey.

The rattlesnake’s brain merges the information from the pit organs with information from the eyes so that a prey’s thermal image is overlaid on the visual one. Julius says it’s actually not hard for humans to approximate what the snake sees: Just look through an infrared camera.

Cuttlefish

Seeing through the eyes of a cephalopod such as a squid, octopus, or nautilus requires a major stretch of the imagination. These sea creatures evolved their eyes separately from vertebrates, so their vision process is very different from ours. For example, cephalopod eyes have no blind spot. And the pupil of a cuttlefish is shaped like a W, making it look especially alien as it pursues prey in the ocean.

Despite their hunting prowess, cuttlefish have blurrier vision than us. “They couldn’t read the fine print on a newspaper,” says Thomas Cronin. “They could only read the headlines.” And even though they have incredible color-changing skills—going from beige to blood-red or striped in the blink of an eye—cuttlefish are totally colorblind.

Cuttlefish eyes have one photoreceptor that lets them see in shades of gray, Cronin says. Another pair of photoreceptors detects polarization. Humans’ only experience of polarized light comes when we wear sunglasses that reduce sun glare by filtering out one orientation of light waves. But unlike cephalopods, we don’t have photoreceptors to detect whether light is polarized or not.

Cuttlefish produce polarization patterns on their skin that they may use to communicate. Looking at one another, cuttlefish would see shades of gray with the polarization information overlaid, not unlike the rattlesnake’s infrared sense.

“I think it’s reasonable to put ourselves in the head of a dog or a cat or a monkey,” Cronin says, “because their brains are similar to ours.” But something like a cuttlefish is so evolutionarily distant—its brain and perceptions are so unlike our own—that we can never know what it experiences. “I don’t think we can put ourselves in their heads.” But, he adds, “Imagining it is fun.”

Elizabeth Preston is the editor of Muse, a magazine about science and ideas for kids, and author of Inkfish, a blog about science and cephalopods for everyone. She has also written for Slate and National Geographic.

Bird and Bee photography © Dr Schmitt, Weinheim, Germany.

The Brazilian Banes: A World Cup Disease Guide

 

A global network of clinicians assess the most common diseases among travelers to Brazil, and the winner is surprising

May 20 / 2014 |By Nsikan Akpan

World Cup

World Cup fans should pack bug spray when visiting the Arena Amazônia in Manaus, Brasil, which sits squarely in a hotbed for yellow fever and malaria. Source: Portal Da Copa/Creative Commons Credit: Portal da Copa via Wikimedia Commons

Stadiums quaked as U.S. soccer fans urged their men’s national team toward their successful qualification for the upcoming FIFA World Cup. Many of these supporters will soon descend on Brazil. There they will be joined by an estimated 600,000 revelers from around the globe. Unfortunately, these travelers may catch far more than the beautiful game.

To forewarn tourists of disease threats in Brazil, a new study led by Harvard University scientists has assessed the illnesses most often contracted during journeys to the South American nation. Researchers studied the case reports of 1,600 people who became sick after returning from Brazil between 1997 and 2013 to offer a snapshot of what people might soon encounter at the World Cup and the 2016 Summer Olympics.
Three big clusters of disease emerged: Feverish blights such as dengue virus and malaria are no strangers to the tropics, yet they landed in third place on the list. Traveler’s diarrhea—that familiar spoiler of overseas trips—was second.
The unexpected winner was skin worms, which accounted for two of every five recorded diagnoses among voyagers. “We were a little surprised by how common these skin infestations were,” says Harvard’s Mary Wilson, a global health specialist who headed the study. “But then if you consider that many cities visited by people are right on the coast, it makes sense.”

The leading skin worm was cutaneous larva migrans (CLM), a hookworm typically caught while hanging around beaches. The worm larvae live in sand and can penetrate the intact skin of a bare foot or an exposed bum. The major source of CLM is dog and cat poop littered on the seashore. One survey of a São Paulo district discovered the parasite in 90 percent of canines and felines whereas a separate inspection of Recife’s Alto Beach, a popular tourist destination, found the worm’s larvae in one of every three sand samples. Rather than discourage beach-goers, however, Wilson and her colleagues hope that the findings encourage people to wear proper footwear and avoid sitting on bare sand.

The report is useful for doctors back home, too, says Susan McLellan, a clinical professor of public health at Tulane University who was not involved with the study. “Family-practice doctors miss CLM all the time or mistake it for another kind of worm,” McLellan says. “The article provides a nice review of the infections that might arise during these mass gatherings.” The survey comprised health data from the GeoSentinel network, a collective of health clinics spanning 40 countries and six continents whose purpose is to measure maladies as they cross international borders.

Mosquito-borne dengue virus, malaria and yellow fever are constant concerns for Brazilian public health officials. Other fears for the World Cup surround the emergence of chikungunya virus, which is carried by the same mosquitoes as dengue and which also causes fevers and rashes. The virus first appeared in the Western Hemisphere in December 2013, and experts have warned that the World Cup might increase the possibility that a new catastrophic epidemic will spread across the Americas.

Four of the 12 World Cup stadiums are located in regions endemic with yellow fever or malaria (see map); the risk of dengue is high throughout the country. Dengue virus and malaria caused the most hospitalizations among the surveyed travelers. No cases of yellow fever were recorded in the study, but the U.S. Centers for Disease Control and Prevention advises vaccination for those attending inland matches in yellow fever hotspots. Immunizations for measles and influenza are recommended, too, given that these infections thrive in crowds. The agency’s website also features a list of health-related Portuguese expressions for visitors to learn, including phrases such as, “I have been bitten by mosquitoes” (Fui picado por pernilongo).

Brazilian cities where World Cup, Olympic, and Paralympic Games will be held. Shading indicates where yellow fever and malaria are prevalent. Disease data sourced from the Centers of Disease Control and Prevention. Source: Wilson ME et al. Clinical Infectious Diseases (2014).

Yet tourists may find it more useful to study the mosquitoes’ behavior. Mosquitoes with malaria live near the Amazon Basin and bite at night. In contrast, the main species harboring dengue and yellow fever—Aedes aegypti—feeds during the day and populates urban areas. They lay eggs in the small puddles of water found in discarded plastic cups, used tires and flowerpots. Outdoor spraying of insecticides has minimal impact, given that Aedes aegypti mosquitoes tend to camp indoors. “The Brazilian Ministry of Health has worked hard to get everyone to empty standing water from homes,” Wilson says.

Dengue has no vaccine or cure, but bug repellents serve as great shields. Wilson adds that luckily the soccer tournament and Olympic games will occur during austral winter, when dengue incidence is lowest for Brazil (see graph).

Dengue fever diagnoses by month from 2008–2012. 48 travelers exposed in Brazil and seen at GeoSentinel clinics (grey bars) are compared to total cases (red line), those in World Cup cities (blue line), and those in Rio de Janeiro reported to the Brazilian Ministry of Health. Source: Wilson ME et al. Clinical Infectious Diseases (2014).

Sexually transmitted infections (STIs) are another health risk for tourists. Nearly one out of five international travelers engages in casual sex while abroad, according to a review of health literature, and about half of these encounters don’t involve the use of condoms or other forms of protection. Approximately a dozen GeoSentinel patients were diagnosed with STIs on their return from Brazil. Brazilian authorities have recently cracked down on its sex worker industry, fearing a possible boom in STI incidence spawned by the games.

The aggressive tactics might be unwarranted, however, because mass gatherings like the World Cup and the Olympics are not historically connected with surges in prostitution or the trafficking of sex workers. “Sensationalism around international sporting events and paid sex is unnecessary,” says Marlise Richter, a sexual health and advocacy specialist at Sonke Gender Justice in South Africa.

During the 2010 World Cup in her home country, Richter and her colleagues interviewed over 2,000 male, female, and transgender sex workers at four sites. They didn’t find any increases in the demand or supply of sex work nor did they observe an influx of migrating prostitutes. The most important action that the authorities could take to limit the spread of STIs, Richter says, is to promote the use of male and female condoms. “People should be having safer sex whether it's with a sex worker, a girlfriend or a one night stand,” she adds.

So pack a pair of flip-flops, some bug repellant—and perhaps a box of condoms, too. Viva Brazil!

Photo of the day

 

 

blacktip-shark-aldabra-seychelles_79785_990x742

(123)

Brain health

 

About

Health

From Elizabeth Scott, M.S., your About.com Health Editor

When we think of things we can do to improve our health, we often turn the focus on our bodies more than our brains. However, brain health and mental sharpness are perhaps more important than any other type of fitness, and definitely deserve our focus. This newsletter brings resources to aid mental fitness, cognitive sharpness, and overall brain health. Enjoy!
--Elizabeth Scott
Want more from About.com Health? Like us on Facebook, follow us on Twitter, or visit our Pinterest page for healthy living tips for you and your family.

Boost Your Brain Health

Search Related Topics:  being positive healthy aging mental fitness

Tips For Mental Sharpness

Search Related Topics:  hormone therapy stress heart disease

The Importance Of Sleep

Search Related Topics:  longevity boosters lifestyle change energy creation

Habits For A Healthy Brain

Search Related Topics:  staying young aging tips fun ways to live longer

Spontaneous thoughts are perceived to reveal meaningful self-insight

 

May 27 / 2014

Carnegie Mellon University

Scientists set out to determine how people perceive their own spontaneous thoughts and if those thoughts or intuitions have any influence over judgment. They found that spontaneous thoughts are perceived to provide potent self-insight and can influence judgment and decisions more than similar, more deliberate kinds of thinking -- even on important topics such as commitment to current romantic partners.


Spontaneous thoughts, intuitions, dreams and quick impressions. We all have these seemingly random thoughts popping into our minds on a daily basis. The question is what do we make of these unplanned, spur-of-the-moment thoughts? Do we view them as coincidental wanderings of a restless mind, or as revealing meaningful insight into ourselves?

A research team from Carnegie Mellon University and Harvard Business School set out to determine how people perceive their own spontaneous thoughts and if those thoughts or intuitions have any influence over judgment. Published in the Journal of Experimental Psychology: General, their research found that spontaneous thoughts are perceived to provide potent self-insight and can influence judgment and decisions more than similar, more deliberate kinds of thinking -- even on important topics such as commitment to current romantic partners.

"We are aware of the output of spontaneous thoughts, but lack insight into the reasons why and processes by which they occurred. Rather than dismiss these seemingly random thoughts as meaningless, our research found that people believe, precisely because they are not controlled, that spontaneous thoughts reveal more meaningful insight into their own mind -- their beliefs, attitudes and preferences -- than similar, deliberate thoughts. As a consequence, spontaneous thoughts can have a more potent influence on judgment," said Carey K. Morewedge, lead author and associate professor of marketing in the Tepper School of Business with an additional appointment in the Dietrich College's Department of Social and Decision Sciences. "People often believe their intuitions, dreams and or random thoughts reveal more insight than the result of more effortful thinking and reasoning. This research helps to explain these curious beliefs."

For the study, Morewedge, CMU's Colleen E. Giblin and Harvard University's Michael I. Norton ran five studies. The first three were designed to test the hypothesis that the more spontaneous a thought is, the more it is believed to provide meaningful self-insight. Participants rated the extent to which different thought categories are spontaneous or controlled and the extent to which each provides self-insight; they recalled either a pleasant or unpleasant childhood event and evaluated the degree that the recollection would provide meaningful self-insight if it happened spontaneously or deliberately; and they generated thoughts about four strangers through a deliberative or spontaneous process and rated how much those thoughts provided them with valuable self-insight.

The results suggest that when people evaluate a particular thought, they not only consider its content, they are also influenced by their more general beliefs about different thought processes. Thoughts with the same content are judged to be more meaningful if they occurred through a spontaneous, uncontrolled process rather than a deliberate, controlled process. The effect was found across various kinds of thought and thought content, including thoughts about other people. This means that the content of spontaneous thought need not be entirely about the self in order for people to feel like they've gleaned meaningful self-insight.

The last two experiments extended the investigation to determine if the greater insight attributed to spontaneous thoughts leads them to have a greater impact on judgment. The researchers tested this first by having participants think about a love interest other than their present or most recent significant other spontaneously or deliberately, report the self-insight that the thought provided and then indicate their attraction toward that person. They found that those who spontaneously generated a thought of a love interest believed that thought revealed more self-insight and perceived their attraction to be stronger than the participants who identified a love interest with deliberate thinking.

Finally, to determine whether this greater influence would extend to both positive and negative spontaneous thoughts, participants recalled a positive or negative experience related to their current or most recent romantic relationship. Participants reported the extent to which the spontaneous and deliberate recollection of that memory would provide them with meaningful self-insight and increase or decrease the likelihood that they would end the relationship. The results showed that participants believed the recollection of a positive or negative experience with their current romantic partner would reveal more self-insight and have a greater influence on their commitment to that relationship if it was recalled spontaneously rather than deliberately.

"The perception that a thought popped into mind out of nowhere can lead people to overvalue their own insights. When considering a thought that came to mind spontaneously, it may be useful to ask yourself the following question: had the same thought come to mind after careful deliberation, would it seem just as meaningful? If you realize that your interpretation of a particular thought depends on whether it came to mind spontaneously, that's an indication that your beliefs about these different kinds of thoughts might be affecting your judgment," said Giblin, a doctoral student in CMU's Tepper School of Business.


Story Source:

The above story is based on materials provided by Carnegie Mellon University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Carey K. Morewedge, Colleen E. Giblin, Michael I. Norton. The (perceived) meaning of spontaneous thoughts.. Journal of Experimental Psychology: General, 2014; DOI: 10.1037/a0036775

Wild Happiness

 

19538_photo_jic5dmmomstvgqlzcydgh6raidvu2hmpyjyavf6lo6pvvsfavj3q_480x360

(123)