Archive | June, 2010

Can money buy happiness? Gallup poll asks, and the world answers

CHAMPAIGN, Ill. — A worldwide survey of more than 136,000 people in 132 countries included questions about happiness and income, and the results reveal that while life satisfaction usually rises with income, positive feelings don’t necessarily follow, researchers report.

The findings, from an analysis of data gathered in the first Gallup World Poll, appear this month in the Journal of Personality and Social Psychology.

“The public always wonders: Does money make you happy?” said University of Illinois professor emeritus of psychology Ed Diener, a senior scientist with the Gallup Organization. “This study shows that it all depends on how you define happiness, because if you look at life satisfaction, how you evaluate your life as a whole, you see a pretty strong correlation around the world between income and happiness,” he said. “On the other hand it’s pretty shocking how small the correlation is with positive feelings and enjoying yourself.”

The Gallup World Poll conducted surveys on a wide range of subjects in a representative sample of people from 132 countries from 2005 to 2006. The poll used telephone surveys in more affluent areas, and door-to-door interviews in rural or less-developed regions.

The countries surveyed represent about 96 percent of the world’s population, the researchers report, and reflect the diversity of cultural, economic and political realities around the globe.

This “first representative sample of planet earth,” the authors wrote, “was used to explore the reasons why ‘happiness’ is associated with higher income.” The researchers were able to look at a long list of attributes of respondents, including their income and standard of living, whether their basic needs for food and shelter were met, what kinds of conveniences they owned and whether they felt their psychological needs were satisfied.

The surveys included a global life evaluation, which asked respondents to rate their lives on a scale that ranged from zero (worst possible life) to 10 (best possible life). Participants also answered questions about positive or negative emotions experienced the previous day. And the poll asked respondents whether they felt respected, whether they had family and friends they could count on in an emergency, and how free they felt to choose their daily activities, learn new things or do “what one does best.”

Like previous studies, the new analysis found that life evaluation, or life satisfaction, rises with personal and national income. But positive feelings, which also increase somewhat as income rises, are much more strongly associated with other factors, such as feeling respected, having autonomy and social support, and working at a fulfilling job.

This is the first “happiness” study of the world to differentiate between life satisfaction, the philosophical belief that your life is going well, and the day-to-day positive or negative feelings that one experiences, Diener said.

“Everybody has been looking at just life satisfaction and income,” he said. “And while it is true that getting richer will make you more satisfied with your life, it may not have the big impact we thought on enjoying life.”

Weiting Ng, of the Singapore Institute of Management; and James Harter and Raksha Arora, of The Gallup Organization, were co-authors on the study with Diener.

Editor’s note: To reach Ed Diener, e-mail: ediener@cyrus.psych.uiuc.edu.

The paper, “Wealth and Happiness Across the World: Material Prosperity Predicts Life Evaluation, Whereas Psychosocial Prosperity Predicts Positive Feeling,” is available from the U. of I. News Bureau.

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Top down approach helps academic medical center reduce unnecessary emergency department X-rays

An imaging algorithm produced by a radiology department and distributed through the medical director’s office, in a top-down fashion, enabled a large, academic medical center to significantly reduce the number of unnecessary cervical spine radiographs (X-rays) in the emergency department, according to a study published in the July issue of the Journal of the American College of Radiology (www.jacr.org).

At the University of Rochester Medical Center in Rochester, NY, it was observed that a large number of routine trauma X-rays of the cervical spine were requested after a CT scan of the cervical spine had demonstrated no significant findings. “In view of the recent increasing awareness of over utilization and concern of the risks from medical radiation, we looked for opportunities to eliminate what we believed were unnecessary or inappropriate exams,” said Mark J. Adams, MD, MBA, FACR, lead author of the study.

“With the assistance of our medical director, a clear algorithm for the X-ray evaluation of post CT cervical spines was developed and distributed from the top down to care providers through their respective departments, not directly from the imaging department,” said Adams. One year after the implementation of the policy, data demonstrated a significant decrease in the number of unnecessary or inappropriate studies being performed. The number of unnecessary X-ray exams performed was reduced by 83 percent between January 2008 and January 2009.

“Not only are these X-ray exams unwarranted, they consume valuable resources, add an additional burden to emergency department and radiology staff, and subject patients to unnecessary radiation,” said Adams.

“It is hoped that this simple approach can also be used to address other improper use of imaging resources, thereby reducing radiation exposure and improving the efficiency of care in the emergency department and acute care setting,” he said.

The July issue of JACR is an important resource for radiology and nuclear medicine professionals as well as students seeking clinical and educational improvement.

For more information about JACR, please visit www.jacr.org.

To receive an electronic copy of an article appearing in JACR or to set up an interview with a JACR author or another ACR member, please contact Heather Curry at 703-390-9822 or hcurry@acr-arrs.org.

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Study suggests more fish than thought may thrive in the ocean’s depths

A study of the occurrence of fishes in the ocean’s deepest reaches — the hadal zone, below 6000 meters — has provided evidence that some species of fishes are more numerous at such depths than experts had thought. The authors of the study, which is published in the July/August issue of BioScience, observed 10 to 20 snailfish congregating at a depth of 7703 meters around a baited video lander in the Japan Trench. The observation period lasted only five hours, so the occurrence of so many snailfish, which were of the species Pseudoliparis amblystomopsis, was a surprise. Together with a critical review of past records of fishes found at great depths, the observations suggest, however, that few species of fishes survive in the darkness of the hadal zone.

Observations at such extreme depths — five times farther down than the oil leak in the Gulf of Mexico resulting from the Deepwater Horizon rig — are technically demanding and consequently rare. The researchers who conducted the new study, Toyonobu Fujii of the University of Aberdeen, United Kingdom, and four of his colleagues, used a free-fall lander that made video recordings of an illuminated patch of the sea floor for one minute every five minutes. This enabled the scientists to distinguish at least 10 individual fish and record their behavior, which was similar to the behavior of fishes observed in 1965 from a bathyscaphe at a depth of 7300 meters in the west Atlantic. The fishes observed by Fujii and colleagues fed on crustaceans that were attracted to the mackerel bait.

How deep fish can live has long been a controversial question. Previous records of fish supposedly captured at great depth are rare and mostly based on trawls, a technique that is subject to uncertainty about exactly when a fish entered the trawl net. Fujii and colleagues remark that “current understanding of the hadal environment is inadequate.” They nonetheless suggest that fish may routinely occur far deeper than previously thought in ocean trenches, and that “liparids do appear to dominate and characterize hadal fish fauna.” More research is necessary, the authors say, to learn how these fish populations interact with those in shallower water.

By noon EST on 1 July 2010 and until early September, the full text of the article will be available for free download through the copy of this press release available at www.aibs.org/bioscience-press-releases/.

BioScience, published 11 times per year, is the journal of the American Institute of Biological Sciences (AIBS). BioScience publishes commentary and peer-reviewed articles covering a wide range of biological fields, with a focus on “Organisms from Molecules to the Environment.” The journal has been published since 1964. AIBS is an umbrella organization for professional scientific societies and organizations that are involved with biology. It represents some 200 member societies and organizations with a combined membership of about 250,000.

The complete list of peer-reviewed articles in the July/August 2010 issue of BioScience is as follows:

Evolutionary Origin of Recombination during Meiosis by Harris Bernstein and Carol Bernstein

A Large Aggregation of Liparids at 7703 meters and a Reappraisal of the Abundance and Diversity of Hadal Fish by Toyonobu Fujii, Alan J. Jamieson, Martin Solan, Philip M. Bagley, and Imants G. Priede

Linking Top-down Forces to the Pleistocene Megafaunal Extinctions by William J. Ripple and Blaire Van Valkenburgh

Ecological Complexity and Pest Control in Organic Coffee Production: Uncovering an Autonomous Ecosystem Service by John Vandermeer, Ivette Perfecto, and Stacy Philpott

Sustainability: Virtuous or Vulgar? by John A. Vucetich and Michael P. Nelson

Challenges in Connecting Cumulative Effects Analysis to Effective Wildlife Conservation Planning by Courtney Schultz

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Planned home births associated with tripling of neonatal mortality rate vs. planned hospital births

Philadelphia, PA, July 1, 2010 — About 1 in 200 women in the US delivers her baby at home, with approximately 75% of these low-risk, single-baby births planned in advance as home deliveries. In a study published online today by the American Journal of Obstetrics & Gynecology (AJOG), researchers from Maine Medical Center, Portland, Maine, analyzed the results of multiple studies from around the world. They report that less medical intervention, characteristic of planned home births, is associated with a tripling of the neonatal mortality rate compared to planned hospital deliveries. Planned home births were characterized by a greater proportion of deaths attributed to respiratory distress and failed resuscitation.

“Our findings raise the question of a link between the increased neonatal mortality among planned home births and the decreased obstetric intervention in this group,” according to lead investigator Joseph R. Wax, MD, Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Maine Medical Center. “Women choosing home birth, particularly low-risk individuals who had given birth previously, are in large part successful in achieving their goal of delivering with less morbidity and medical intervention than experienced during hospital-based childbirth. Of significant concern, these apparent benefits are associated with a doubling of the neonatal mortality rate overall and a near tripling among infants born without congenital defects (nonanomalous). …These findings echo concerns raised in a recent large US cohort study in which home births experienced significantly more 5-minute Apgar scores < 7 as compared to low-risk term hospital births, suggesting an increased need for resuscitation among home births. Therefore, the personnel, training, and equipment available for neonatal resuscitation represent other possible contributors to the excessive neonatal mortality rate among planned home births.”

Investigators conducted a rigorous metaanalysis through which the peer-reviewed medical literature was searched for studies that contained information about home and hospital deliveries, including morbidity and mortality data for both mother and child. They extracted data for a total of 342,056 planned home and 207,551 planned hospital deliveries. The results are striking as women planning home births were of similar and often lower obstetric risk than those planning hospital births.

In contrast to neonatal mortality rates, investigators observed that perinatal mortality rates for planned home and hospital births were similar overall, as well as just among nonanomalous offspring.

Mothers in planned home births experienced significantly fewer medical interventions including epidural analgesia, electronic fetal heart rate monitoring, episiotomy, and operative vaginal and cesarean deliveries. Likewise, women intending home deliveries had fewer infections, perineal and vaginal lacerations, hemorrhages, and retained placentas. Data also showed that planned home births are characterized by less frequent premature and low birthweight infants.

AJOG Editors-in- Chief Thomas J. Garite, MD, and Moon H. Kim, MD, commented that “The report by Wax et al supports the safety of planned home birth for the mother, but raises serious concerns about increased risks of home birth for the newborn infant. This topic deserves more attention from public health officials at state and national levels.”

The article is “Maternal and newborn outcomes in planned home birth vs planned hospital births: a metaanalysis” by Joseph R. Wax, MD; F. Lee Lucas, PhD; Maryanne Lamont, MLS; Michael G. Pinette, MD; Angelina Cartin; and Jacquelyn Blackstone, DO. It will appear in the American Journal of Obstetrics & Gynecology, Volume 203, Issue 3 (September 2010) published by Elsevier. DOI: 10.1016/j.ajog.2010.05.028

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‘Trophic cascades’ of disruption may include loss of woolly mammoth, saber-toothed cat

CORVALLIS, Ore. — A new analysis of the extinction of woolly mammoths and other large mammals more than 10,000 years ago suggests that they may have fallen victim to the same type of “trophic cascade” of ecosystem disruption that scientists say is being caused today by the global decline of predators such as wolves, cougars, and sharks.

In each case the cascading events were originally begun by human disruption of ecosystems, a new study concludes, but around 15,000 years ago the problem was not the loss of a key predator, but the addition of one — human hunters with spears.

In a study published today in the journal BioScience, researchers propose that this mass extinction was caused by newly-arrived humans tipping the balance of power and competing with major predators such as saber-toothed cats. An equilibrium that had survived for thousands of years was disrupted, possibly explaining the loss of two-thirds of North America’s large mammals during this period.

“For decades, scientists have been debating the causes of this mass extinction, and the two theories with the most support are hunting pressures from the arrival of humans, and climate change,” said William Ripple, a professor of forest ecosystems and society at Oregon State University, and an expert on the ecosystem alterations that scientists are increasingly finding when predators are added or removed.

“We believe humans indeed may have been a factor, but not as most current theory suggests, simply by hunting animals to extinction,” Ripple said. “Rather, we think humans provided competition for other predators that still did the bulk of the killing. But we were the triggering mechanism that disrupted the ecosystem.”

In the late Pleistocene, researchers say, major predators dominated North America in an uneasy stability with a wide range of mammals: mammoths, mastodons, ground sloths, camels, horses, and several species of bison. The new study cites previous evidence from carnivore tooth wear and fracture, growth rates of prey, and other factors that suggest that there were no serious shortages of food caused by environmental change 10,000 to 15,000 years ago.

Quite contrary to that, the large herbivores seemed to be growing quickly and just as quickly had their numbers reduced by a range of significant carnivorous predators, not the least of which was lions, dire wolves, and two species of saber-toothed cats. Food was plentiful for herbivores, the system was balanced, but it was dominated by predators.

“When human hunters arrived on the scene, they provided new competition with these carnivores for the same prey,” said Blaire Van Valkenburgh, an expert at UCLA on the paleobiology of carnivores, and a co-author with Ripple on this study.

“The humans were also omnivores, and could live on plant foods if necessary,” Van Valkenburgh said. “We think this may have triggered a sequential collapse not only in the large herbivores but ultimately their predators as well. Importantly, humans had some other defenses against predation, such as fire, weapons and living in groups, so they were able to survive.”

But the driving force in eliminating the large mammals, according to the new theory, was not humans — they just got the process started. After that, predators increasingly desperate for food may have driven their prey to extinction over long periods of time — and then eventually died out themselves.

In recent studies in Yellowstone National Park and elsewhere, scientists from OSU and other institutions have explored these “trophic cascades,” often caused by the loss or introduction of a single major predator in an ecosystem. With the elimination of wolves from Yellowstone, for instance, the numbers of elk exploded. This caused widespread overgrazing; damage to stream ecosystems; the slow demise of aspen forests; and ultimate effects on everything from trees to beaver, fish, birds, and other life forms. When wolves were re-introduced to Yellowstone, studies are showing that those processes have begun to reverse themselves.

“We think the evidence shows that major ecosystem disruptions, resulting in these domino effects, can be caused either by subtracting or adding a major predator,” Ripple said. “In the case of the woolly mammoths and saber-toothed tiger, the problems may have begun by adding a predator, in this case humans.”

The new analysis draws on many other existing studies in making its case.

For instance, other research describes this process with a model in modern times in Alaska. There, the allowance of relatively limited human hunting on moose caused wolves to switch some of their predation to sheep, ultimately resulting in a precipitous decline in populations not only of moose but also wolves and sheep.

The loss of species in North America during the late Pleistocene was remarkable — about 80 percent of 51 large herbivore species went extinct, along with more than 60 percent of important large carnivores. Previous research has documented the growth rates of North American mammoths by studying their tusks, revealing no evidence of reduced growth caused by inadequate food — thus offering no support for climate-induced habitat decline.

It seems that diverse and abundant carnivores kept herbivore numbers below levels where food becomes limiting. By contrast, the large population of predators such as dire wolves and saber tooth cats caused them to compete intensely for food, as evidenced by heavy tooth wear.

“Heavily worn and fractured teeth are a result of bone consumption, something most carnivores avoid unless prey is difficult to acquire,” says Van Valkenburgh.

Trophic cascades initiated by humans are broadly demonstrated, the researchers report. In North America, it may have started with the arrival of the first humans, but continues today with the extirpation of wolves, cougars and other predators around the world. The hunting of whales in the last century may have led to predatory killer whales turning their attention to other prey such as seals and sea otters – and the declines in sea otter populations has led to an explosion of sea urchins and collapse of kelp forest ecosystems.

“In the terrestrial realm, it is important that we have a better understanding of how Pleistocene ecosystems were structured as we proceed in maintaining and restoring today’s ecosystems,” the researchers wrote in their conclusion. “In the aquatic realm, the Earth’s oceans are the last frontier for megafaunal species declines and extinctions.”

“The tragic cascade of species declines due to human harvesting of marine megafauna happening now may be a repeat of the cascade that occurred with the onset of human harvesting of terrestrial megafauna more than 10,000 years ago. This is a sobering thought, but it is not too late to alter our course this time around in the interest of sustaining Earth’s ecosystems.”

Editor’s Note: A digital graphic drawing of a woolly mammoth fighting with a saber-toothed tiger can be obtained online: http://www.flickr.com/photos/oregonstateuniversity/4746479327/

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It’s nice to be noticed – even in Florence AL

As a science writer, I am always pleased when someone notices my work and recommends it. That was the case today when a writer for the Times Daily newspaper in Northwestern Alabama named Bernie Delinski used and cited my web page about Pluto’s change in status in his weekly “Just Ask” column. I e-mailed Bernie [...]

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New variants found that indicate a predisposition to type 2 diabetes

ANN ARBOR, Mich.—An international team co-led by scientists from the University of Michigan have discovered 12 more regions on the genome with DNA variants that are associated with increased risk of type 2 diabetes, bringing the number to 38.

A variant is a place on a string of DNA where one of the “letters,” or nucleotides, differs between people. At most places along the DNA, any two people will have the same letter. The variable places in the DNA are important because some variants can increase predisposition to disease and other conditions, or offer drug targets.

Researchers also wanted to know if people who hadn’t yet developed type 2 diabetes but did have the diabetes variant showed elevated blood glucose levels, a main predictor of diabetes, said study co-leader Laura Scott, associate research scientist at the U-M School of Public Health.

“What our study suggests is that many of these variants are associated with changes in glucose levels long before people get diabetes,” said study co-leader Michael Boehnke, professor of biostatistics at U-M’s School of Public Health.

One surprising finding was that the regions with diabetes variants also seemed to be associated with nonrelated diseases. Researchers looked at a database containing a list of all the genome wide association (GWA) studies to date. They examined regions where there was a type 2 diabetes association to see if there was an increased association for other diseases and traits that have been studied thus far.

“We saw surprising overlap or predisposition of not just related but also apparently unrelated traits,” said Boehnke, who suggested that there could be master regulators in the genome that play a role in many different aspects of physiology and health.

The next step is to take the research beyond GWA, which looks at a few million places on the genome, into genome sequencing. Genome sequencing will allow researchers to assay most of the 3 billion base pairs in the human genome and find less common variants that might be associated with disease. Currently, a three-study international team co-led by the Michigan group is sequencing 2,650 individuals with and without diabetes, in what is one of the largest sequencing projects underway in the world. Scott and Boehnke hope to have information about the variants present in individuals with and without diabetes within the next year-and-a-half.

The paper, “Twelve type 2 diabetes susceptibility loci identified through large-scale association analysis,” appeared online June 27 in Nature Genetics.

For more on Boehnke: www.sph.umich.edu/iscr/faculty/profile.cfm?uniqname=boehnke

For more on Scott: www.sph.umich.edu/iscr/faculty/profile.cfm?uniqname=ljst

The University of Michigan School of Public Health has been working to promote health and prevent disease since 1941, and is consistently ranked among the top five public health schools in the nation. Whether making new discoveries in the lab or researching and educating in the field, SPH faculty, students and alumni are deployed around the globe to promote and protect our health.

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NASA’s TRMM satellite sees heavy rainfall in Hurricane Alex

Hurricane Alex is generating some very heavy rainfall, and the Tropical Rainfall Measuring Mission satellite known as TRMM has been calculating it from its orbit in space.

As predicted by the National Hurricane Center (NHC) in Miami, Florida, Alex intensified after entering the warm waters of the southwest Gulf of Mexico.

At NASA’s Goddard Space Flight Center in Greenbelt, Md., scientists created an analysis of Alex’s rainfall using data captured by the TRMM satellite on June 29, 2010 at 1350 UTC (9:50 a.m. EDT). At that time the sustained winds around Alex were estimated to be 60 knots (~69 mph). Alex continued to strengthen and was classified as a hurricane early on 30 June 2010. This made Alex the first hurricane in the 2010 Atlantic hurricane season.

The rainfall analysis used TRMM Precipitation Radar (PR) data and TRMM Microwave Imager (TMI) data. The TMI data showed that a heavy band of precipitation (some areas showed rain falling at more than 2 inches per hour) was spiraling into the center of Alex’s intensifying circulation. The precipitation analysis was overlaid on visible and infrared data from TRMM’s Visible Infrared Scanner (VIRS). In the image created, Geostationary Operational Environmental Satellite (GOES East) visible image data was used to fill in locations not viewed by the TRMM satellite to form a complete picture of the storm.

Alex is expected to continue to be a large rainmaker when it makes landfall. Rainfall accumulations are expected of between 6 and 12 inches, with isolated amounts of 20 inches.

Tropical Storm-force winds are expected to reach coastal areas in the warning areas this afternoon, while hurricane-force winds will reach the coast tonight. In addition, the National Hurricane Center noted “a dangerous storm surge will raise water levels by as much as 3 to 5 feet above ground level along the immediate coast to the north of where the center makes landfall.”

By 11 a.m. EDT, Alex was still a category one hurricane with maximum sustained winds near 80 mph. Alex was located about 145 miles (235 km) east of La Pesca, Mexico and 190 miles (310 km) southeast of Brownsville, Texas. That makes Alex’s center near 23.8 North and 95.5 West. Alex is moving northwest at 7 mph (11 km/hr), and has a minimum central pressure near 961 millibars.

Satellite data show that Alex is a large hurricane and the hurricane force winds extend outward up to 60 miles (95 km) from the center. Tropical storm force winds extend outward up to 200 miles (325 km) primarily to the northeast of the center.

The National Hurricane Center noted today that “Given such a low minimum pressure…the current satellite presentation and a favorable environment for intensification…the winds should increase today and Alex could reach category two before landfall.”

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Memory links to 40 winks

When it comes to executing items on tomorrow’s to-do list, it’s best to think it over, then “sleep on it,” say psychologists at Washington University in St. Louis.

People who sleep after processing and storing a memory carry out their intentions much better than people who try to execute their plan before getting to sleep. The researchers have shown that sleep enhances our ability to remember to do something in the future, a skill known as prospective memory.

Moreover, researchers studying the relationship between memory and sleep say that our ability to carry out our intentions is not so much a function of how firmly that intention has been embedded in our memories. Rather, the trigger that helps carry out our intentions is usually a place, situation or circumstance — some context encountered the next day — that sparks the recall of an intended action.

These are the key findings from a study published this month in Psychological Science of the relationship between memory and sleep. Researchers Michael Scullin, doctoral candidate in psychology, and his adviser, Mark McDaniel, PhD, professor of psychology in Arts & Sciences, are focusing on “prospective memory” — things we intend to do — as opposed to “retrospective memory” — things that have happened in the past.

Prospective memory includes such things as remembering to take a medication, buying a Mother’s Day card or bringing home the ice cream for a birthday party. While the vast majority of sleep literature in psychology is devoted to retrospective memory, this study is the first foray into the relationship between sleep and prospective memory, the kind of memory we put to work every day. The findings, researchers say, offer important contributions to the understanding of the role sleep plays in cognition as well as memory.

Let’s say that you intend to give a colleague a message tomorrow, McDaniel explains. Seeing the colleague the next day will be a strong cue for remembering to give the message. But, during the time your brain encoded the intention, you’re also vaguely thinking of a meeting the two of you will attend the next afternoon. The context of the conference room is weakly associated with your intention to give the message even though you haven’t really thought explicitly about associating the room with the message.

The Scullin/McDaniel study shows that sleep strengthens the weak association between the conference room (the context) and the delivery of the message (the intention). But sleep does little or nothing with the stronger association between the person and the message.

“We found that sleep benefits prospective memory by strengthening the weak associations in the brain, and that hasn’t been shown before,” Scullin says.

“One of the more provocative findings we have is that sleep didn’t strengthen the link between the explicit cue, which is the person, and the intention, rather it strengthened the weak association and the intention,” McDaniel says.

Here’s how they showed it:

The researchers tested four different groups each of 24 Washington University students. Two were control groups — one tested in the morning, the other in the evening — to eliminate the notion that the biological clock might play any role in memory function. Another group was prepped for tests in the morning then tested twelve hours later in the evening before getting to sleep. The fourth group learned the test routine in the evening, went home and slept, then were tested 12 hours later in the morning.

Participants were given instructions for three tests in this order and the tests later were given in blocks of 150 items in the same order: a living/non-living test, in which they decided if a word (cat, for instance, or skate) indicated a living or non-living entity; a lexical decision test, in which participants decided if a string of letters was a word or nonsense; and a semantic category test, in which a word was classified by participants into a category, baseball, for instance, in the category of sport.

After learning the last test, participants were told that in the midst of these ongoing tests — given to represent such everyday activities as driving, watching TV, listening to a teacher — the words table or horse would pop up on a screen, and when they saw them, they were to press the “Q” button. This represented the prospective memory intention.

The researchers found that participants who tested in the morning following sleep overwhelmingly performed the prospective memory task better in the semantic category test, or context, than in the other two, and they found no such correlation in the group who tested sleepless.

The crux of the finding rests on the fact that the prospective memory instruction was given right after the semantic category practice. In this context, those who slept remembered the prospective memory intention better than in the other categories.

“Sleep promoted the remembering to do the prospective memory task when that one context was present, but not when some other context was present,” McDaniel says. “That’s because of temporal contiguity — the fact that the participants were told to hit that ‘Q’ button right after they were exposed to the semantic category context.

“The idea is that the semantic category test is weakly associated with the prospective memory intention — it’s weakly floating around in the mind and becomes weakly associated with the prospective memory test,” McDaniel says.

To return to the colleague and message analogy, because before sleeping you remembered you had a message to deliver to your colleague and you would see him in the conference room tomorrow, sleep enhances the likelihood that you will tell him in the conference room, but not in some other context, the office, elevator, the mail room, for example.

The researchers believe that the prospective memory process occurs during slow wave sleep — an early pattern in the sleep cycle — involving communication between the hippocampus and cortical regions. The hippocampus is very important in memory formation and reactivation and the cortical regions are keys to storing memories.

“We think that during slow wave sleep the hippocampus is reactivating these recently learned memories, taking them up and placing them in long-term storage regions in the brain,” Scullin says. “The physiology of slow wave sleep seems very conducive to this kind of memory strengthening.”

Mark McDaniel

Professor of Psychology in Arts & Sciences

(314) 935-8030

mmcdanie@artsci.wustl.edu

Michael Scullin

Doctoral candidate in psychology in Arts & Sciences

(314) 935-7610

mscullin@wustl.edu

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Flowering and freezing tolerance linked in wheat, study shows

New research by UC Davis wheat geneticist Jorge Dubcovsky and his colleagues could lead to new strategies for improving freezing tolerance in wheat, which provides more than one-fifth of the calories consumed by people around the world.

The new findings, published June 22 in the Online First issue of the journal Plant Physiology, shed light on the connection between flowering and freezing tolerance in wheat.

In winter wheat and barley varieties, long exposures to non-freezing cold temperatures accelerate flowering time in a process known as vernalization. These exposures also prepare the wheat to better tolerate freezing, a process known as cold acclimation.

In their new study, Dubcovsky and his colleagues at UC Davis, The Ohio State University and in Hungary, demonstrated that when the main vernalization gene, VRN1, is expressed in the leaves, it initiates a process that leads to decreased expression of the freezing tolerance genes. (In genetics, “expression” refers to the process by which information carried by the gene is used to create a protein.)

“This system enables wheat and other temperate grasses to respond differently to cool temperatures in the fall than they would to cool temperatures in the spring,” said Dubcovsky, a professor in UC Davis’ Department of Plant Sciences.

Dubcovsky heads UC Davis’ wheat breeding program and Wheat Molecular Genetics Laboratory. The lab coordinates a broad-based research program that aims to provide the scientific information needed to develop healthier and more productive varieties of wheat.

He noted that a cool temperature in the fall, when plants have low levels of the vernalization gene VRN1, activates the freezing tolerance genes, helping to trigger the plants’ acclimation to cold temperatures. This is essential in the fall, when cool temperatures are an indication that winter’s freezing temperatures are approaching.

“However the same cool temperature in the spring, when high levels of the vernalization gene VRN1 are present in the leaves, results in a weaker response of the freezing tolerance genes,” Dubcovsky said. “This avoids initiating the plants’ cold-acclimation response, which requires a lot of the plants’ energy and is unnecessary in the spring because warmer weather is approaching.”

This work was supported by the National Research Initiative from the USDA National Institute of Food and Agriculture.

Through federal funding and leadership for research, education and extension programs, NIFA focuses on investing in science and solving critical issues impacting people’s daily lives and the nation’s future. For more information, visit www.nifa.usda.gov.

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Anger drives support for wartime presidents

It’s no secret that Americans tend to throw their support behind a sitting U.S. president when the nation is thrust into a war or other potentially violent conflict with a foreign foe — a phenomenon known as the “rally ’round the flag effect.”

But new experimental psychology research from Washington University in St. Louis is the first to offer compelling evidence that these wartime surges in presidential support represent a collective reaction to a specific human emotion.

“It’s about anger, not anxiety,” says Alan Lambert, PhD, professor of psychology in Arts & Sciences and lead author of the study published this month in the Journal of Personality and Social Psychology. “Anger is the engine that drives these sudden spikes in presidential approval ratings.”

His findings, to be presented July 7 at the 33rd annual meeting of the International Society of Political Psychology in San Francisco, Calif., show that anger — not anxiety — is the dominant emotion that both triggers and feeds the rally effect.

While there are many competing theories about why rally effects occur, their existence is well documented. Rally effects contributed to dramatic and sustained spikes in popularity for John F. Kennedy after the Cuban Mission Crisis, for George Herbert Walker Bush during Operation Desert Storm and for George W. Bush after the 9/11 terror attacks on the World Trade Center. After 9/11, George W. Bush’s popularity surged by almost 40 points, reaching as high as 90 percent and remaining much higher than normal for nearly a year, according to the Gallup Poll.

Contrary to popular opinion and previous speculations among psychologists, Lambert’s study shows that the impulse to support the president in times of war has little to do with feelings of anxiety or uncertainty or needing a president to somehow make us feel safe. Nor do pre-existing political ideologies and values prevent us from being pushed at least a bit further down the militaristic path.

“Whereever you start on the ideological spectrum, your support for the president is pushed in an upward direction by feelings of anger,” he says. “It’s not a rationale thought process. It’s a very primitive, almost knee-jerk response.”

Lambert’s findings are based on a five-year study that began in 2003 with experiments measuring shifts in pro-military attitudes among college students who watched eight minutes of a CNN “America Remembers” documentary on the 9/11 terror attacks.

He and a team of Washington University psychology student co-investigators surveyed a group of 136 college students to establish a baseline score of the participants’ attitudes toward George W. Bush, pro-war policies, patriotic symbols and conservative views.

In some of the earlier studies, half the students were randomly assigned to watch the CNN terror attack video, while the other half completed simple anagram word games. Participants’ moods were then assessed to measure current levels of anger, unhappiness, anxiety and other emotions; each then rated their own favorableness toward a list of prominent political figures and controversial political issues, including iconic examples from both ends of the liberal and conservative spectrum.

As expected, those exposed to the CNN 9/11 video scored much higher on measures of anger than those completing the mundane word game, and regardless of their initial political leanings, most video viewers showed a marked increase in their support both for George W. Bush and his militaristic policies.

“Keep in mind,” says Lambert, “that this was a group of typical college students, many of whom didn’t like the war and for the most part, didn’t like George Bush at the beginning of the study. But, if you make them angry and you remind them about the war, they still end up showing increased support for George Bush.”

While existing theories tend to frame rally effects as part of a general shift to the right, Lambert’s study found no evidence for an across-the-board increase in support for conservative social policies, such as restrictions on abortion and prayer in schools.

“Anger clearly increased support for the president, but that effect was very narrowly confined to the president’s military policies,” he says. “It didn’t affect attitudes toward gays. It didn’t affect attitudes toward abortion. It had absolutely no effect at all on any other political ideology apart from militaristic attitudes. It’s absolutely a rifle shot, something that pushes just this one button.”

As part of the study, Lambert and his team conducted three more experiments designed to show that findings from the first experiment were not confined to scenarios involving George W. Bush and the 9/11 attacks. Nor were the findings skewed by some underlying patriotic bias embedded within the CNN documentary.

In one follow-up experiment, the CNN video was replaced with a session in which participants were asked to write about their own personal recollections of the 9/11 attack. In another, participants were asked to recall some event in their past about which they still felt angry, an exercise that prompted recollections ranging from broken romances, lost jobs and fights with sports coaches.

“Our last experiments showed that you can cause increased support for military action even when you make people angry for reasons that are completely unrelated to politics,” Lambert says. “In our last experiment, we came up with this hypothetical Bush-like hawkish politician and we got the same effects.”

As Lambert explains it, most types of threats — especially outside threats — tend to trigger off two types of emotion: anger and anxiety. His study used various experimental and statistical methods to tease apart and isolate the consequences of anxiety from anger, showing that feelings of anxiety may actually diminish support for a president’s war plans.

“When you isolated the anger from anxiety, the anger led to more support for the president and the anxiety led to somewhat more negative reactions,” he says. “Our data suggests that when people are anxious, they don’t really like risky political policies. Going to war or continuing a war is a risky sort of activity, and when people are anxious, they tend to be risk averse.”

Making people angry, on the other hand, sets into motion a much different cluster of behavioral tendencies.

“When people are angry,” Lambert says, “they start preferring and liking things that they would not normally prefer. They start liking aggressive politicians more than they otherwise would, and they start disliking passive or dovish politicians. So, in a sense, once the emotion is activated, it has a life of its own, and starts directing your thoughts and attitudes, independent of how you might have felt before you became angry.

“If I kick you, you’re going to look for some way to kick me back; but when something happens to the entire country, you need to look for someone more powerful than you to carry out that role, and in least in our culture, it’s the president that does that.”

Lambert suspects that the psychology behind the rally effect may explain why leaders in countries such as North Korea and Iran are so quick to rattle sabers in their dealings with adversaries around the globe — the threat of conflict abroad can shore up support for politicians at home.

These findings also have clear implications for America’s support for Barack Obama. Presidential approval ratings for Obama, while still relatively good, are not nearly as high as they were at the beginning of his presidency. Lambert’s research suggests that Obama’s popularity would be most likely increased in the context of a military, as opposed to a non-military conflict. For example, even if Obama had managed to quickly resolve the problem with the oil spill in the gulf, this would have been unlikely to result in a sustained boost in approval.

While findings from this study may be limited to an American context, Lambert recently returned from a year as a Fulbright Scholar in the former Soviet republic of Georgia, where he conducted similar research and found much the same results.

“Essentially, a rally effect is a function of collective remembering and collective emotion,” Lambert says. “There’s a difference between one isolated person feeling something, or even just a couple thousand. Here, we’re talking about millions of people all remembering and all feeling the same thing at more or less the same time. That doesn’t happen very often, but when it does, it’s an incredibly powerful thing.”

Lambert’s co-authors include current graduate students Laura Scherer and John Paul Schott along with former undergraduates Kristina Olson, Rick Andrews, Thomas Obrien and Alison Zisser, all then in the Department of Psychology in Arts & Sciences at Washington University. (Since this research has been conducted, Kristina Olson has gone on Yale University, where she is a member of the psychology faculty; the other co-authors (Rick Andrews, Thomas O’Brien, and Alison Zisser) are now enrolled in graduate programs in the social sciences.)

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Kilimani Sesame has positive impact on children in Tanzania: Johns Hopkins University study

There are 8.3 million children who are 5 years and younger living in Tanzania. With limited access to formal education, can media intervention make a positive and significant impact on what these children learn? Sesame Workshop, which produces Kilimani Sesame, the Tanzanian version of Sesame Street, recently commissioned researchers from the Johns Hopkins Bloomberg School of Public Health in full collaboration with a Dar es Salaam-based research team, to examine the effects of a six-week intervention delivering Kilimani Sesame content to 223 children in the rural district of Kisarawe and the city of Dar es Salaam. The article is expected to be published in July in the Journal of Applied Developmental Psychology, and the abstract can be read here: http://dx.doi.org/10.1016/j.appdev.2010.05.002

Kilimani Sesame, which features the feathered and furry Muppets of Sesame Street characters, presents educational objectives that include improving children’s basic literacy and numeracy skills, as well as providing knowledge and reducing the stigma related to HIV/AIDS. The study found that children with greater exposure to Kilimani Sesame showed more gains in cognitive, social and health outcomes than those with less exposure. Specifically, children who viewed more Kilimani Sesame content had higher scores on tests of literacy and primary math skills, greater ability to describe appropriate social behaviors and emotions, and knew more about malaria and HIV/AIDS. Children with greater exposure to Kilimani Sesame were also more likely to say an HIV positive child could play with others and that they would invite an HIV positive person into their home to share a meal. These findings remained robust over and above the contribution of factors that are important in predicting these outcomes: child age, child gender, location, general media exposure, and the child’s performance in these outcomes prior to the intervention.

“We are pleased that researchers at an esteemed academic institution have found evidence of the impact of this media intervention.” said Dr. Charlotte Cole, Vice President of International Education, Research, and Outreach at Sesame Workshop. “Children learn best when learning opportunities match their own daily life experiences. Kiilmani Sesame, which was developed by a team of Tanzanian educators and producers, provides images and content that features an environment familiar to its viewers and imparts age-appropriate messages — such as malaria prevention information — that are critical to children living in the country.”

“This was an exciting opportunity to see how media can have a great impact,” described Dr. Dina L.G. Borzekowski, an Associate Professor with the Johns Hopkins Bloomberg School of Public Health’s Department of Health, Behavior and Society. She continued, “Despite lacking basic resources such as household water and electricity, children in this study benefited from the culturally-relevant and age-appropriate books, radio and video. Sesame Workshop demonstrates how media can best be used engage and motivate young children. This intervention offers a powerful, educational foundation to help Tanzanian children reach their highest potential.”

The full findings will be available in the Journal of Applied Developmental Psychology, published by Elsevier, next month.

Funded by the United States Agency for International Development (USAID), Kilimani Sesame was a multimedia educational project in Kiswahili consisting of thirteen half-hour television shows airing in Tanazania Broadcasting Company (TBC) and Television Zanzibar (TVZ), thirteen 15-minute radio shows, three storybooks, and a teacher and parent guide containing early childhood education tips and activities. The program launched in 2008.

Sesame Workshop is the nonprofit educational organization that revolutionized children’s television programming with the landmark Sesame Street. The Workshop produces local Sesame Street programs, seen in over 140 countries, and other acclaimed shows to help bridge the literacy gap including The Electric Company. Beyond television, the Workshop produces content for multiple media platforms on a wide range of issues including literacy, health and military deployment. Initiatives meet specific needs to help young children and families develop critical skills, acquire healthy habits and build emotional strength to prepare them for lifelong learning. Learn more at www.sesameworkshop.org.

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Molecular signatures may aid fight against pediatric liver disease

Researchers have identified a set of “molecular signatures” for biliary atresia — the most common diagnosis leading to liver transplant in children — that can help identify the progression of disease at diagnosis and predict clinical outcomes.

The Cincinnati Children’s Hospital Medical Center scientists found that using traditional methods to analyze liver biopsies, only 14 of 47 infants with biliary atresia could be identified as having either inflammation or fibrosis (development of excess fibrous connective tissue). By examining the expression of the entire genome in the liver, the researchers developed a molecular signature that could classify the vast majority of the patients as inflamed or fibrotic.

“This suggests that the molecular profile at diagnosis may determine the ‘stage’ of liver disease through specific biological pathways that are not easily distinguishable by standard approaches,” says Jorge Bezerra, M.D., a gastroenterologist at Cincinnati Children’s and senior author of the study. “Infants with inflammation were younger, indicating that inflammation may reflect an earlier stage of disease — particularly given that those with fibrosis had decreased survival without transplant.”

The researchers hope that, given the ability to identify how disease will progress, current treatments can be tailored to the stage of the liver disease and that new treatments can be developed.

Biliary atresia is a rare disease of the liver and bile ducts that occurs in infants. Symptoms of the disease appear or develop about two to eight weeks after birth. When a baby has biliary atresia, bile flow from the liver to the gallbladder is blocked. This causes the bile to be trapped inside the liver, eventually causing liver failure.

The study, published in Genome Medicine, was funded by grants from the National Institutes of Health.

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Eternally green: New eco-friendly cremations and burials

People who care about improving the environment in life may soon be able to do so after death. Entrepreneurs in Europe have developed two new and unusual methods of body disposal — including a low-heat cremation method and a corpse compost method that turns bodies into soil — that could provide environmentally friendly alternatives to those now in use. That’s the topic of an article in the current issue of Chemical & Engineering News (C&EN), ACS’ weekly newsmagazine.

C&EN Associate Editor Sarah Everts notes that environmentally minded individuals have several concerns about cremation and burial practices. The high temperature of cremation burns up lots of fuel and releases carbon dioxide, the major greenhouse gas, into the atmosphere. Cremation also releases mercury from dental fillings into the air. Some worry that formaldehyde and other toxic substances that undertakers use to prepare bodies for burial can leach into the environment.

Entrepreneurs have developed two green alternatives that are soon launching in North America or Europe. They include a new cremation method that breaks down a corpse using a highly corrosive alkaline substance rather than extremely high heat. Because the temperatures used in the new process is also 80 percent cooler than standard cremation temperatures, the process uses less energy and produces lower carbon dioxide emissions. A newly developed burial method allows corpses to be composted (decomposed) into soil instead of transforming to dust in a sealed casket. The unusual process involves freezing the body in liquid nitrogen, breaking it into smaller pieces, and freeze-drying the parts, which are then placed in a biodegradable coffin for burial. Over time, the body turns into soil instead of undergoing the standard decaying process. “No matter how you look at it, there’s just no pretty way to go,” said one of the entrepreneurs.

ARTICLE FOR IMMEDIATE RELEASE

“Green for Eternity”

This story is available at

http://pubs.acs.org/cen/science/88/8826sci2.html

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Conserving nature and dollars: Delivering cost-effective biodiversity protection

A more flexible approach to the expansion of protected area systems could ultimately protect much more biodiversity for the same budget according to a new paper in the scientific journal Nature.
Lead author Dr Richard Fuller of the CSIRO Climate Adaptation Flagship and The University of Queensland said that without spending extra money “we could dramatically improve the performance of protected area systems by replacing a small number of poor performing areas with more cost-effective ones”.

Protected areas are one of the most important tools in modern nature conservation, with over 100,000 sites covering about 12 per cent of the land and territorial waters of countries worldwide.

The paper examines how effectively different sites can conserve a range of vegetation types.

“Replacing the least cost-effective 1 per cent of Australia’s 6990 strictly protected areas could more than double the number of vegetation types that have 15 per cent or more of their original extent protected,” Dr Fuller said.

“We can do this if we reverse the protection status of the least cost-effective sites and use the resulting capital to establish and manage new protected areas.”

The authors of the paper, including colleagues from CSIRO and The University of Queensland, acknowledge that community values would need to be incorporated when considering changes to the protected status of selected reserves. However, the benefits of reducing management costs in low performing areas are also worth exploring.

By being informed by this analysis method, future investments in protected areas could better protect biodiversity from threats such as climate change.

“As the rate of investment in new protected areas has slowed globally in recent years ensuring the best places are protected is more important than ever,” Dr Fuller said.

The Climate Adaptation Flagship is enabling Australia to adapt more effectively to the impacts of climate change and variability. This includes developing adaptation options to protect Australia’s marine and terrestrial species, ecosystems and the services they provide.

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UM School of Medicine scientists develop new strategy that may improve cognition

For the first time, scientists have linked a brain compound called kynurenic acid to cognition, possibly opening doors for new ways to enhance memory function and treat catastrophic brain diseases, according to a new study from the University of Maryland School of Medicine. When researchers decreased the levels of kynurenic acid in the brains of mice, their cognition was shown to improve markedly, according to the study, which was published in the July issue of the journal Neuropsychopharmacology. The study is the result of decades of pioneering research in the lab of Robert Schwarcz, Ph.D., a professor of psychiatry, pediatrics and pharmacology and experimental therapeutics at the University of Maryland School of Medicine.

“We believe that interventions aimed specifically at reducing the level of kynurenic acid in the brain are a promising strategy for cognitive improvement in both healthy patients and in those suffering from a variety of brain diseases ranging from schizophrenia to Alzheimer’s disease,” says Dr. Schwarcz.

Kynurenic acid is a substance with unique biological properties and is produced when the brain metabolizes the amino acid L-tryptophan. The compound is related to another breakdown product of tryptophan known as quinolinic acid. In 1983, Dr. Schwarz published a paper in the journal Science identifying the critical role excessive quinolinic acid plays in the neurodegenerative disorder Huntington’s disease. He has since designed a therapeutic strategy targeting quinolinic acid for the treatment of Huntington’s disease. Dr. Schwarcz also is involved in a company called VistaGen, which pursues the development of neuroprotective drugs based on this concept.

In the study published this month, Dr. Schwarcz and his colleagues at the Maryland Psychiatric Research Center — a world-renowned clinical and basic science research center at the University of Maryland School of Medicine — examined mice that had been genetically engineered to have more than 70 percent lower kynurenic acid levels than ordinary mice. These mice were found to perform significantly better than their normal peers on several widely used tests that specifically measure function in the hippocampus. The hippocampus is a critical area of the brain for memory and spatial navigation. The mice were clearly superior in their ability to explore and recognize objects, to remember unpleasant experiences and to navigate a maze. The engineered animals also showed increased hippocampal plasticity, meaning they had a greatly improved ability to convert electrical stimuli into long-lasting memories.

“These results are very exciting, because they open up an entirely new way of thinking about the formation and retrieval of memories,” says Dr. Schwarcz. “Kynurenic acid has been known for more than 150 years, but only now do we recognize it as a major player in one of the fundamental functions of the brain. Our most recent work, still unpublished, shows that new chemicals that specifically influence the production of kynurenic acid in the brain predictably affect cognition. We are now in the process of developing such compounds for cognitive enhancement in humans.”

“I feel confident Dr. Schwarcz’s determined pursuit of answers for the desperate patients suffering from devastating neurodegenerative disorders such as Alzheimer’s disease and Huntington’s disease, and psychotic disorders such as schizophrenia, will pay off,” says E. Albert Reece, M.D., Ph.D., M.B.A., vice president for medical affairs, University of Maryland, and John Z. and Akiko K. Bowers Distinguished Professor and dean, University of Maryland School of Medicine. “His work creates hope for these patients and their families, and his findings are making a significant impact on the field of neuroscience and psychiatric medicine.”

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Psychological research conducted in WEIRD nations may not apply to global populations

A new University of British Columbia study says that an overreliance on research subjects from the U.S. and other Western nations can produce false claims about human psychology and behavior because their psychological tendencies are highly unusual compared to the global population.

According to the study, the majority of psychological research is conducted on subjects from Western nations, primarily university students. Between 2003 and 2007, 96 per cent of psychological samples came from countries with only 12 per cent of the world’s populations. The U.S. alone provided nearly 70 per cent of these subjects.

However, the study finds significant psychological and behavioral differences between what the researchers call Western, Educated, Industrialized, Rich and Democratic (WEIRD) societies and their non-WEIRD counterparts across a spectrum of key areas, including visual perception, fairness, spatial and moral reasoning, memory and conformity.

The findings, published in Nature tomorrow and Behavioral Sciences this week, raise questions about the practice of drawing universal claims about human psychology and behavior based on research samples from WEIRD societies.

“The foundations of human psychology and behavior have been built almost exclusively on research conducted on subjects from WEIRD societies,” says UBC Psychology and Economics Prof. Joe Henrich, who led the study with UBC co-authors Prof. Steven Heine and Prof. Ara Norenzayan. “While students from Western nations are a convenient, low-cost data pool, our findings suggest that they are also among the least representative populations one could find for generalizing about humans.”

The study, which reviews the comparative database of research from across the behavioural sciences, finds that subjects from WEIRD societies are more individualistic, analytic, concerned with fairness, existentially anxious and less conforming and attentive to context compared to those from non-WEIRD societies.

According to the study, significant psychological and behavioral differences also exist between population groups within WEIRD nations. For example, U.S. undergraduate students are typically more analytic and choosy and less conforming than U.S. adults without college educations.

“Researchers often implicitly assume that there is little variation across human populations or that these ‘standard subjects’ are as representative of the species as any other population,” says Henrich. “Our study shows there is substantial variability in experimental results across populations. In fact, there is enough evidence that researchers cannot in good faith continue to make species-generalizing claims about Homo sapiens in the absence of comparative evidence.”

The research team calls on universities, peer reviewers, funding agencies and journal editors to push researchers to explicitly support any generalizations to the species with evidence or potent inductive arguments. Additionally, they envision the creation of research partnerships with non-WEIRD institutions to further and expand and diversify the empirical base of the behavioral sciences.

View the study, “The weirdest people in the world?,” and comprehensive commentary by the authors and colleagues in the research community at: http://journals.cambridge.org/action/displayIssue?jid=BBS&volumeId=33&issueId=2-3&iid=7825832

An opinion piece by the authors, to appear in the journal Nature on July 1, is available by request from the authors.

Contacts:

Prof. Joseph.Henrich

UBC Psychology/Economics

Cell: 778-833-4234

joseph.henrich@gmail.com

*Currently in UK

Prof. Steven Heine

UBC Dept. of Psychology

Cell: 604-812-6908

Office: 604-822-6908

heine@psych.ubc.ca

Prof. Ara Norenzayan

UBC Dept. of Psychology

Cell: 604.221.1722

Office: 604.827.5134

ara@psych.ubc.ca

Basil Waugh

UBC Public Affairs

Tel: 604.822.2048

basil.waugh@ubc.ca

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Man-made global warming started with ancient hunters

WASHINGTON — Even before the dawn of agriculture, people may have caused the planet to warm up, a new study suggests.

Mammoths used to roam modern-day Russia and North America, but are now extinct — and there’s evidence that around 15,000 years ago, early hunters had a hand in wiping them out. A new study, accepted for publication in Geophysical Research Letters, a journal of the American Geophysical Union (AGU), argues that this die-off had the side effect of heating up the planet.

“A lot of people still think that people are unable to affect the climate even now, even when there are more than 6 billion people,” says the lead author of the study, Chris Doughty of the Carnegie Institution for Science in Stanford, California. The new results, however, “show that even when we had populations orders of magnitude smaller than we do now, we still had a big impact.”

In the new study, Doughty, Adam Wolf, and Chris Field — all at Carnegie Institution for Science — propose a scenario to explain how hunters could have triggered global warming.

First, mammoth populations began to drop — both because of natural climate change as the planet emerged from the last ice age, and because of human hunting. Normally, mammoths would have grazed down any birch that grew, so the area stayed a grassland. But if the mammoths vanished, the birch could spread. In the cold of the far north, these trees would be dwarfs, only about 2 meters (6 feet) tall. Nonetheless, they would dominate the grasses.

The trees would change the color of the landscape, making it much darker so it would absorb more of the Sun’s heat, in turn heating up the air. This process would have added to natural climate change, making it harder for mammoths to cope, and helping the birch spread further.

To test how big of an effect this would have on climate, Field’s team looked at ancient records of pollen, preserved in lake sediments from Alaska, Siberia, and the Yukon Territory, built up over thousands of years. They looked at pollen from birch trees (the genus Betula), since this is “a pioneer species that can rapidly colonize open ground following disturbance,” the study says. The researchers found that around 15,000 years ago — the same time that mammoth populations dropped, and that hunters arrived in the area — the amount of birch pollen started to rise quickly.

To estimate how much additional area the birch might have covered, they started with the way modern-day elephants affect their environment by eating plants and uprooting trees. If mammoths had effects on vegetation similar to those of modern elephants , then the fall of mammoths would have allowed birch trees to spread over several centuries, expanding from very few trees to covering about one-quarter of Siberia and Beringia — the land bridge between Asia and Alaska. In those places where there was dense vegetation to start with and where mammoths had lived, the main reason for the spread of birch trees was the demise of mammoths, the model suggests.

Another study, published last year, shows that “the mammoths went extinct, and that was followed by a drastic change in the vegetation,” rather than the other way around, Doughty says. “With the extinction of this keystone species, it would have some impact on the ecology and vegetation — and vegetation has a large impact on climate.”

Doughty and colleagues then used a climate simulation to estimate that this spread of birch trees would have warmed the whole planet more than 0.1 degrees Celsius (0.18 degrees Fahrenheit) over the course of several centuries. (In comparison, the planet has warmed about six times more during the past 150 years, largely because of people’s greenhouse gas emissions.)

Only some portion — about one-quarter — of the spread of the birch trees would have been due to the mammoth extinctions, the researchers estimate. Natural climate change would have been responsible for the rest of the expansion of birch trees. Nonetheless, this suggests that when hunters helped finish off the mammoth, they could have caused some global warming.

In Siberia, Doughty says, “about 0.2 degrees C (0.36 degrees F) of regional warming is the part that is likely due to humans.”

Earlier research indicated that prehistoric farmers changed the climate by slashing and burning forests starting about 8,000 years ago, and when they introduced rice paddy farming about 5,000 years ago. This would suggest that the start of the so-called “Anthropocene” — a term used by some scientists to refer to the geological age when mankind began shaping the entire planet — should be dated to several thousand years ago.

However, Field and colleagues argue, the evidence of an even earlier man-made global climate impact suggests the Anthropocene could have started much earlier. Their results, they write, “suggest the human influence on climate began even earlier than previously believed, and that the onset of the Anthropocene should be extended back many thousands of years.”

This work was funded by the Carnegie Institution for Science and NASA.

Notes for Journalists

As of the date of this press release, the paper by Doughty et al. is still “in press” (i.e. not yet published). Journalists and public information officers (PIOs) of educational and scientific institutions who have registered with AGU can download a PDF copy of this paper in press by clicking on this link: http://www.agu.org/journals/pip/gl/2010GL043985-pip.pdf

Or, you may order a copy of the paper by emailing your request to Maria-José Viñas at mjvinas@agu.org. Please provide your name, the name of your publication, and your phone number.

Neither the paper nor this press release are under embargo.

Title:
“Biophysical feedbacks between the Pleistocene megafauna extinction and climate: The first human‐induced global warming?”

Authors:
Christopher E. Doughty, Adam Wolf, and Christopher B. Field, Department of Global Ecology, Carnegie Institution for Science, Stanford, California, USA

Contact information for the authors:
Christopher E. Doughty, Carnegie Institution for Science, +1 (408) 489-1524, cdoughty@stanford.edu

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Unpeeling atoms and molecules from the inside out

Menlo Park, Calif.–The first published scientific results from the world’s most powerful hard X-ray laser, located at the Department of Energy’s SLAC National Accelerator Laboratory, show its unique ability to control the behaviors of individual electrons within simple atoms and molecules by stripping them away, one by one — in some cases creating hollow atoms.

These early results — one published today, the other last week — describe in great detail how the Linac Coherent Light Source’s intense pulses of X-ray light change the very atoms and molecules they are designed to image. Controlling those changes will be critical to achieving the atomic-scale images of biological molecules and movies of chemical processes that the LCLS is designed to produce.

In a report published in the July 1 issue of Nature, a team led by Argonne National Laboratory physicist Linda Young describes how they were able to tune LCLS pulses to selectively strip electrons, one by one, from atoms of neon gas. By varying the photon energies of the pulses, they could do it from the outside in or — a more difficult task — from the inside out, creating so-called “hollow atoms.”

“Until very recently, few believed that a free-electron X-ray laser was even possible in principle, let alone capable of being used with this precision,” said William Brinkman, director of DOE’s Office of Science. “That’s what makes these results so exciting.”

Young, who led the first experiments in October with collaborators from SLAC and five other institutions, said, “No one has ever had access to X-rays of this intensity, so the way in which ultra-intense X-rays interact with matter was completely unknown. It was important to establish these basic interaction mechanisms.”

SLAC’s Joachim Stöhr, director of the LCLS, said, “When we thought of the first experiments with LCLS ten years ago, we envisioned that the LCLS beam may actually be powerful enough to create hollow atoms, but at that time it was only a dream. The dream has now become reality.”

In another report, published June 22 in Physical Review Letters, a team led by physicist Nora Berrah of Western Michigan University — the third group to conduct experiments at the LCLS — describes the first experiments on molecules. Her group also created hollow atoms, in this case within molecules of nitrogen gas, and found surprising differences in the way short and long laser pulses of exactly the same energies stripped and damaged the nitrogen molecules.

“We just introduced molecules into the chamber and looked at what was coming out there, and we found surprising new science,” said Matthias Hoener, a postdoctoral researcher in Berrah’s group at WMU and visiting scientist at Lawrence Berkeley National Laboratory who was first author of the paper. “Now we know that by reducing the pulse length, the interaction with the molecule becomes less violent.”

While the first experiments were designed to see what the LCLS can do and how its ultra-fast, ultra-bright pulses interact with atoms and molecules, they also pave the way for more complex experiments to come. Its unique capabilities make the LCLS a powerful tool for research in a wide range of fields, including physics, chemistry, biology, materials, and energy sciences.

The LCLS forms images by scattering X-ray light off an atom, molecule or larger sample of material. Yet when the LCLS X-rays are tightly focused by mirrors, each powerful laser pulse destroys any sample it hits. Since certain types of damage, like the melting of a solid, are not instantaneous and only develop with time, the trick is to minimize the damage during the pulse itself and record the X-ray snapshot with a camera before the sample disintegrates.

Both teams found that the shorter the laser pulse, the fewer electrons are stripped away from the atom or molecule and the less damage is done. And both delved into the detailed mechanisms behind that damage.

Atoms are a little like miniature solar systems, with their electrons orbiting at various distances from the nucleus in a sort of quantum fuzz. To make things simpler, scientists describe the electrons as orbiting in “shells” at specific distances from the nucleus. The innermost shell contains up to two electrons, the next one up to eight, the third one up to 18, and so on.

Since they’re closest to the positively charged nucleus, the two innermost electrons are generally the hardest to wrest away. But they also most readily absorb photons of X-ray light, and so are the most vulnerable to getting stripped away by intense X-rays.

Although previous experiments with intense optical lasers had stripped neon atoms of most of their electrons, Young’s was the first to discover how ultra-intense X-ray lasers do this. At low photon energies, the outer electrons are removed, leaving the inner electrons untouched. However, at higher photon energies, the inner electrons are the first to be ejected; then the outer electrons cascade into the empty inner core, only to be kicked out by later parts of the same X-ray pulse. Even within the span of a single pulse there may be times when both inner electrons are missing, creating a hollow atom that is transparent to X-rays, Young said.

“This transparency associated with hollow atoms could be a useful property for future imaging experiments, because it decreases the fraction of photons doing damage and allows a higher percentage of photons to scatter off the atom and create the image,” Young said. She said application of this phenomenon will also allow researchers to control how deeply an intense X-ray pulse penetrates into a sample.

Berrah’s team bombarded puffs of nitrogen gas with laser pulses that ranged in duration from about four femtoseconds, or quadrillionths of a second, to 280 femtoseconds. No matter how short or long it was, though, each pulse contained the same amount of energy in the form of X-ray light; so you might expect that they would have roughly the same effects on the nitrogen molecules.

But to the team’s surprise, that was not the case, Hoener said. The long pulses stripped every single electron from the nitrogen molecules, starting with the ones closest to the nucleus; the short ones stripped off only some of them.

Their report attributes this to the “frustrated absorption effect”: Since the molecule’s electrons are preferentially stripped from the innermost shells, there is simply not enough time during a short pulse for the molecule’s outermost electrons to refill the innermost shells and get kicked out in turn.

With all this activity going on inside the atom, scientists have a new way to explore atomic structure and dynamics. Further experiments have investigated nanoclusters of atoms, protein nanocrystals and even individual viruses, with results expected to be published in coming months.

Young’s research was primarily supported by the DOE Office of Science, with additional support from the Alexander von Humboldt Foundation. Berrah’s research was supported by the DOE Office of Science.

The LCLS is a DOE Office of Science-funded project led by SLAC National Accelerator Laboratory in partnership with Argonne National Laboratory and Lawrence Livermore National Laboratory. Pacific Northwest National Laboratory provided initial project management support. Lawrence Berkeley National Laboratory and Cornell University contributed key subsystems. University of California, Los Angeles provided theoretical physics support throughout the project; Brookhaven and Los Alamos national laboratories were active in the early stages of LCLS research and development.

SLAC National Accelerator Laboratory is a multi-program laboratory exploring frontier questions in photon science, astrophysics, particle physics and accelerator research. SLAC is located in Menlo Park, California, and is operated by Stanford University for the U.S. Department of Energy Office of Science.

Argonne National Laboratory seeks solutions to pressing national problems in science and technology. The nation’s first national laboratory, Argonne conducts leading-edge basic and applied scientific research in virtually every scientific discipline. Argonne researchers work closely with researchers from hundreds of companies, universities, and federal, state and municipal agencies to help them solve their specific problems, advance America’s scientific leadership and prepare the nation for a better future. With employees from more than 60 nations, Argonne is managed by UChicago Argonne, LLC, for the U.S. Department of Energy’s Office of Science.

Western Michigan University is a dynamic, student-centered research university with an enrollment of 25,000. WMU is focused on delivering high-quality undergraduate instruction, advancing its growing graduate division and fostering significant research activities.

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Linguistics professor examines manufacturers’ prescription drug websites

Dartmouth Linguistics Professor Lewis Glinert and Jon Schommer, the associate head of the Department of Pharmaceutical Care and Health Systems at the University of Minnesota, have examined the corporate websites dedicated to the 100 best-selling prescription drugs. They found a startling lack of consistency in an industry where advertising standards are regulated by the Food and Drug Administration (FDA).

“Communicating via a website is common practice today,” says Glinert, “and consumers are very savvy about doing their own research on the Internet. The FDA has rules about direct-to-consumer print and television drug advertising, so we think it makes sense to also regulate websites and other marketing tools when it comes to prescription medicine. Consumers need consistent and balanced information.”

Glinert presented their study, “Manufacturers’ prescription drug web sites: A gray area of discourse and ethics,” at the Communication, Medicine and Ethics (COMET) 2010 Conference at Boston University School of Public Health on June 28. Glinert and Schommer have previously published on the topic of direct-to-consumer drug advertising and Glinert has also presented their research at an FDA hearing.

In this paper, Glinert and Schommer found that the websites:

  • have no obvious linear narrative or ‘next page’ or conclusion; users move in a maze of text and navigation choices, some leading far away
  • lack a popular genre name (like infomercial), meaning that users come to them without a clear idea of how to perceive them
  • have an unpredictable mix of information and promotion, content, verbal style, visuals, and layout
  • often present safety and risk information in small font, in cumbersome un-bulleted blocks of text, detached from promotional text and videos, and below a page’s scrolling ‘fold’

Glinert notes that the Internet search engine Google has also been working to help consumers with their research on prescription drugs. A Google search of a prescription or generic drug name, for example Lipitor, will now display a summary and description at the top of the search results. The new feature, developed in partnership with the National Institutes of Health, links to NIH content and risk data. (Background information at: http://venturebeat.com/2010/06/22/google-health-search-adds-drug-info-upping-pharma-ad-spend/ and http://searchengineland.com/google-adds-new-health-search-feature-for-medications-44757 )

“Our research provides justification for Google’s move,” says Glinert. “Only time will tell if this is a major change for the better.”

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