Chapter 18. Attention and Higher Cognition
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By JOHN COATES SIX years after the financial meltdown there is once again talk about market bubbles. Are stocks succumbing to exuberance? Is real estate? We thought we had exorcised these demons. It is therefore with something close to despair that we ask: What is it about risk taking that so eludes our understanding, and our control? Part of the problem is that we tend to view financial risk taking as a purely intellectual activity. But this view is incomplete. Risk is more than an intellectual puzzle — it is a profoundly physical experience, and it involves your body. Risk by its very nature threatens to hurt you, so when confronted by it your body and brain, under the influence of the stress response, unite as a single functioning unit. This occurs in athletes and soldiers, and it occurs as well in traders and people investing from home. The state of your body predicts your appetite for financial risk just as it predicts an athlete’s performance. If we understand how a person’s body influences risk taking, we can learn how to better manage risk takers. We can also recognize that mistakes governments have made have contributed to excessive risk taking. Consider the most important risk manager of them all — the Federal Reserve. Over the past 20 years, the Fed has pioneered a new technique of influencing Wall Street. Where before the Fed shrouded its activities in secrecy, it now informs the street in as clear terms as possible of what it intends to do with short-term interest rates, and when. Janet L. Yellen, the chairwoman of the Fed, declared this new transparency, called forward guidance, a revolution; Ben S. Bernanke, her predecessor, claimed it reduced uncertainty and calmed the markets. But does it really calm the markets? Or has eliminating uncertainty in policy spread complacency among the financial community and actually helped inflate market bubbles? We get a fascinating answer to these questions if we turn from economics and look into the biology of risk taking. © 2014 The New York Times Company
By Meeri Kim, Many of us find ourselves swimming along in the tranquil sea of life when suddenly a crisis hits — a death in the family, the loss of a job, a bad breakup. Some power through and find calm waters again, while others drown in depression. Scientists continue to search for the underlying genes and neurobiology that dictate our reactions to stress. Now, a study using mice has found a switch-like mechanism between resilience and defeat in an area of the brain that plays an important role in regulating emotions and has been linked with mood and anxiety disorders. (Bo Li/Cold Spring Harbor Laboratory) - Researchers at Cold Spring Harbor Laboratory identify the neurons in the brain that determine if a mouse will learn to cope with stress or become depressed. These neurons, located in a region of the brain known as the medial prefrontal cortex (top, green image) become hyperactive in depressed mice. The bottom panel is close-up of above image - yellow indicates activation. The team showed that this enhanced activity causes depression. After artificially enhancing the activity of neurons in that part of the brain — the medial prefrontal cortex — mice that previously fought to avoid electric shocks started to act helpless. Rather than leaping for an open escape route, they sat in a corner taking the pain — presumably out of a belief that nothing they could do would change their circumstances. “This helpless behavior is quite similar to what clinicians see in depressed individuals — an inability to take action to avoid or correct a difficult situation,” said study author and neuroscientist Bo Li of the Cold Spring Harbor Laboratory in New York. The results were published online May 27 in the Journal of Neuroscience. © 1996-2014 The Washington Post
Link ID: 19704 - Posted: 06.06.2014
Neil Levy Can human beings still be held responsible in the age of neuroscience? Some people say no: they say once we understand how the brain processes information and thereby causes behaviour, there’s nothing left over for the person to do. This argument has not impressed philosophers, who say there doesn’t need to be anything left for the person to do in order to be responsible. People are not anything over and above the causal systems involved in information processing, we are our brains (plus some other, equally physical stuff). We are responsible if our information processing systems are suitably attuned to reasons, most philosophers think. There are big philosophical debates concerning what it takes to be suitably attuned to reasons, and whether this is really enough for responsibility. But I want to set those debates aside here. It’s more interesting to ask what we can learn from neuroscience about the nature of responsibility and about when we’re responsible. Even if neuroscience doesn’t tell us that no one is ever responsible, it might be able to tell us if particular people are responsible for particular actions. A worthy case study Consider a case like this: early one morning in 1987, a Canadian man named Ken Parks got up from the sofa where he had fallen asleep and drove to his parents’-in-law house. There he stabbed them both before driving to the police station, where he told police he thought he had killed someone. He had: his mother-in-law died from her injuries. © 2010–2014, The Conversation Trust (UK)
By Sadie Dingfelder Want to become famous in the field of neuroscience? You could go the usual route, spending decades collecting advanced degrees, slaving away in science labs and publishing your results. Or you could simply fall victim to a freak accident. The stars of local science writer Sam Kean’s new book, “The Tale of the Dueling Neurosurgeons,” (which he’ll discuss Saturday at Politics and Prose) took the latter route. Be it challenging the wrong guy to a joust, spinning out on a motorcycle, or suffering from a stroke, these folks sustained brain injuries with bizarre and fascinating results. One man, for instance, lost the ability to identify different kinds of animals but had no trouble naming plants and objects. Another man lost his short-term memory. The result? A diary filled with entries like: “I am awake for the very first time.” “Now, I’m really awake.” “Now, I’m really, completely awake.” Unfortunate mishaps like these have advanced our understanding of how the gelatinous gray mass that (usually) stays hidden inside our skulls gives rise to thoughts, feelings and ideas, Kean says. “Traditionally, every major discovery in the history of neuroscience came about this way,” he says. “We had no other way of looking at the brain for centuries and centuries, because we didn’t have things like MRI machines.” Rather than covering the case studies textbook-style, Kean provides all the gory details. Consider Phineas Gage. You may remember from Psych 101 that Gage, a railroad worker, survived having a metal rod launched through his skull. You might not know, however, that one doctor “shaved Gage’s scalp and peeled off the dried blood and gelatinous brains. He then extracted skull fragments from the wound by sticking his fingers in from both ends, Chinese-finger-trap-style,” as Kean writes in his new book. © 1996-2014 The Washington Post
By Denali Tietjen Meditation has long been known for its mental health benefits, but new research shows that just a few minutes of mindfulness can improve physical health and personal life as well. A recent study conducted by researchers at INSEAD and The Wharton School found that 15 minutes of mindful meditation can help you make better decisions. The research, published in the Association for Psychological Science’s journal Psychological Science, comes from four studies (varying in sample size from 69 to 178 adults) in which participants responded to sunk-cost scenarios at different degrees of mindful awareness. The results consistently showed that increased mindfulness decreases the sunk-cost bias. WOAH, hold the phone. What’s a sunk cost and what’s a sunk-cost bias?? Sunk cost is an economics term that psychologists have adopted. In economics, sunk costs are defined as non-recoverable investment costs like the cost of employee training or a lease on office space. In psychology, sunk costs are basically the same thing: The time and energy we put into our personal lives. Though we might not sit down with a calculator at the kitchen table when deciding who to take as our plus one to our second cousin’s wedding next weekend, we do a cost-benefit analysis every time we make a decision. And we take these sunk costs into account. The sunk-cost bias, then, is the tendency to allow sunk costs to overly influence current decisions. Mindfulness meditation can provide improved clarity, which helps you stay present and make better decisions, the study says. This protects you from that manipulative sunk-cost bias.
Link ID: 19693 - Posted: 06.05.2014
By Matthew R. Francis Possibly no subject in science has inspired more nonsense than quantum mechanics. Sure, it’s a complicated field of study, with a few truly mysterious facets that are not settled to everyone’s satisfaction after nearly a century of work. At the same time, though, using quantum to mean “we just don’t know” is ridiculous—and simply wrong. Quantum mechanics is the basis for pretty much all our modern technology, from smartphones to fluorescent lights, digital cameras to fiber-optic communications. If I had to pick a runner-up in the nonsense sweepstakes, it would be human consciousness, another subject with a lot of mysterious aspects. We are made of ordinary matter yet are self-aware, capable of abstractly thinking about ourselves and of recognizing others (including nonhumans) as separate entities with their own needs. As a physicist, I’m fascinated by the notion that our consciousness can imagine realities other than our own: The universe is one way, but we are perfectly happy to think of how it might be otherwise. I hold degrees in physics and have spent a lot of time learning and teaching quantum mechanics. Nonphysicists seem to have the impression that quantum physics is really esoteric, with those who study it spending their time debating the nature of reality. In truth, most of a quantum mechanics class is lots and lots of math, in the service of using a particle’s quantum state—the bundle of physical properties such as position, energy, spin, and the like—to describe the outcomes of experiments. Sure, there’s some weird stuff and it’s fun to talk about, but quantum mechanics is aimed at being practical (ideally, at least). © 2014 The Slate Group LLC.
Link ID: 19671 - Posted: 05.31.2014
By DOUGLAS QUENQUA It’s easy to think of fruit flies as tiny robots that simply respond reflexively to their environment. But just like humans, they take time to collect information and to deliberate when faced with a difficult choice, according to a new study. The findings, published in the journal Science, could help researchers study cognitive development and defects in humans. Scientists have long been fascinated by decision-making, said an author of the study, Dr. Gero Miesenböck, a neuroscientist at the University of Oxford. “Going back to the 19th century, psychologists have measured how long it takes humans to make up their minds,” he said. “Usually if you give people a hard perceptual choice, they take longer, because the brain needs to integrate information until it has enough to make a decision. “This is the first time in an animal as low as a fruit fly we have been able to show that similar processes occur.” To study how flies make up their minds, Oxford researchers placed the animals in bifurcated chambers filled on both sides with an odor they had been taught to avoid. When the odor was clearly more potent on one side of the chamber than the other, the flies were quick to choose which chamber to inhabit (and nearly always chose the less odorous one). But when the difference between chambers was subtle, the flies took longer to make a decision, and were more apt to make the wrong choice. “We were surprised,” Dr. Miesenböck said. “The original thought was that the flies would just act impulsively, they won’t take time to deliberate. We found that’s not true.” The process so closely mimics decision-making in humans, the researchers said, that the same mathematical models used to describe the actions of deliberating people can be used to predict a fly’s behavior. © 2014 The New York Times Company
Link ID: 19653 - Posted: 05.23.2014
Kevin Loria Music was among the least of Mr. B's concerns. As a 59-year-old Dutch man living with extremely severe obsessive compulsive disorder for 46 years, he had other things on his mind. His OCD was so severe it led to moderate anxiety and mild depression. Not only was his condition extreme, but it was also resistant to traditional treatment. It got so bad that he opted to receive an implant to stimulate his brain constantly with electricity — a treatment, called deep brain stimulation (DBS), that has been shown to successfully treat OCD in the past. It worked, but had a very peculiar side effect. As researchers write in a study published in the journal Frontiers in Behavioral Neuroscience, it turned Mr. B. into a Johnny Cash fanatic, though he'd never really listened to The Man in Black before. Mr. B. had listened to the same music for decades, but was never a devout music lover. He was a Rolling Stones and Beatles fan (with a preference for the Stones), and listened to Dutch music as well. But just months after flying to Minneapolis and having two sets of electrodes tunneled into his brain for the shock therapy, he had a mind-blowing run-in with the song "Ring of Fire" playing on the radio. Something about Cash's deep bass-baritone voice resonated with him at that moment. His life had already changed. After the surgical implants and therapy, his OCD had gone from extremely severe to mild, and his depression and anxiety were at a level lower than mild. But when he heard Cash croon, another change began. Mr. B. bought all the Johnny Cash music he could find and stopped listening to anything else — no more Beatles, no more Stones, no more Nederpop. Instead, he played Cash all the time, and especially loved the songs from the '70s and '80s. "Folsom Prison Blues," "Ring Of Fire," and "Sunday Morning Come-Down" are his favorites. They make him feel like a hero, he told doctors. © 2014 Business Insider, Inc.
After a string of scandals involving accusations of misconduct and retracted papers, social psychology is engaged in intense self-examination—and the process is turning out to be painful. This week, a global network of nearly 100 researchers unveiled the results of an effort to replicate 27 well-known studies in the field. In more than half of the cases, the result was a partial or complete failure. As the replicators see it, the failed do-overs are a healthy corrective. “Replication helps us make sure what we think is true really is true,” says Brent Donnellan, a psychologist at Michigan State University in East Lansing who has undertaken three recent replications of studies from other groups—all of which came out negative. “We are moving forward as a science,” he says. But rather than a renaissance, some researchers on the receiving end of this organized replication effort see an inquisition. “I feel like a criminal suspect who has no right to a defense and there is no way to win,” says psychologist Simone Schnall of the University of Cambridge in the United Kingdom, who studies embodied cognition, the idea that the mind is unconsciously shaped by bodily movement and the surrounding environment. Schnall’s 2008 study finding that hand-washing reduced the severity of moral judgment was one of those Donnellan could not replicate. About half of the replications are the work of Many Labs, a network of about 50 psychologists around the world. The results of their first 13 replications, released online in November, were greeted with a collective sigh of relief: Only two failed. Meanwhile, Many Labs participant Brian Nosek, a psychologist at the University of Virginia in Charlottesville, put out a call for proposals for more replication studies. After 40 rolled in, he and Daniël Lakens, a psychologist at Eindhoven University of Technology in the Netherlands, chose another 14 to repeat. © 2014 American Association for the Advancement of Science.
|By Isaac Bédard Very few animals have revealed an ability to consciously think about the future—behaviors such as storing food for the winter are often viewed as a function of instinct. Now a team of anthropologists at the University of Zurich has evidence that wild orangutans have the capacity to perceive the future, prepare for it and communicate those future plans to other orangutans. The researchers observed 15 dominant male orangutans in Sumatra for several years. These males roam through immense swaths of dense jungle, emitting loud yells every couple of hours so that the females they mate with and protect can locate and follow them. The shouts also warn away any lesser males that might be in the vicinity. These vocalizations had been observed by primatologists before, but the new data reveal that the apes' last daily call, an especially long howl, is aimed in the direction they will travel in the morning—and the other apes take note. The females stop moving when they hear this special 80-second call, bed down for the night, and in the morning begin traveling in the direction indicated the evening before. The scientists believe that the dominant apes are planning their route in advance and communicating it to other orangutans in the area. They acknowledge, however, that the dominant males might not intend their long calls to have such an effect on their followers. Karin Isler, a Zurich anthropologist who co-authored the study in PLOS ONE last fall, explains, “We don't know whether the apes are conscious. This planning does not have to be conscious. But it is also more and more difficult to argue that they [do not have] some sort of mind of their own.” © 2014 Scientific American
By BENEDICT CAREY SAN DIEGO – The last match of the tournament had all the elements of a classic showdown, pitting style versus stealth, quickness versus deliberation, and the world’s foremost card virtuoso against its premier numbers wizard. If not quite Ali-Frazier or Williams-Sharapova, the duel was all the audience of about 100 could ask for. They had come to the first Extreme Memory Tournament, or XMT, to see a fast-paced, digitally enhanced memory contest, and that’s what they got. The contest, an unusual collaboration between industry and academic scientists, featured one-minute matches between 16 world-class “memory athletes” from all over the world as they met in a World Cup-like elimination format. The grand prize was $20,000; the potential scientific payoff was large, too. One of the tournament’s sponsors, the company Dart NeuroScience, is working to develop drugs for improved cognition. The other, Washington University in St. Louis, sent a research team with a battery of cognitive tests to determine what, if anything, sets memory athletes apart. Previous research was sparse and inconclusive. Yet as the two finalists, both Germans, prepared to face off — Simon Reinhard, 35, a lawyer who holds the world record in card memorization (a deck in 21.19 seconds), and Johannes Mallow, 32, a teacher with the record for memorizing digits (501 in five minutes) — the Washington group had one preliminary finding that wasn’t obvious. “We found that one of the biggest differences between memory athletes and the rest of us,” said Henry L. Roediger III, the psychologist who led the research team, “is in a cognitive ability that’s not a direct measure of memory at all but of attention.” People have been performing feats of memory for ages, scrolling out pi to hundreds of digits, or phenomenally long verses, or word pairs. Most store the studied material in a so-called memory palace, associating the numbers, words or cards with specific images they have already memorized; then they mentally place the associated pairs in a familiar location, like the rooms of a childhood home or the stops on a subway line. The Greek poet Simonides of Ceos is credited with first describing the method, in the fifth century B.C., and it has been vividly described in popular books, most recently “Moonwalking With Einstein,” by Joshua Foer. © 2014 The New York Times Company
By NATASHA SINGER Joseph J. Atick cased the floor of the Ronald Reagan Building and International Trade Center in Washington as if he owned the place. In a way, he did. He was one of the organizers of the event, a conference and trade show for the biometrics security industry. Perhaps more to the point, a number of the wares on display, like an airport face-scanning checkpoint, could trace their lineage to his work. A physicist, Dr. Atick is one of the pioneer entrepreneurs of modern face recognition. Having helped advance the fundamental face-matching technology in the 1990s, he went into business and promoted the systems to government agencies looking to identify criminals or prevent identity fraud. “We saved lives,” he said during the conference in mid-March. “We have solved crimes.” Thanks in part to his boosterism, the global business of biometrics — using people’s unique physiological characteristics, like their fingerprint ridges and facial features, to learn or confirm their identity — is booming. It generated an estimated $7.2 billion in 2012, according to reports by Frost & Sullivan. Making his rounds at the trade show, Dr. Atick, a short, trim man with an indeterminate Mediterranean accent, warmly greeted industry representatives at their exhibition booths. Once he was safely out of earshot, however, he worried aloud about what he was seeing. What were those companies’ policies for retaining and reusing consumers’ facial data? Could they identify individuals without their explicit consent? Were they running face-matching queries for government agencies on the side? Now an industry consultant, Dr. Atick finds himself in a delicate position. While promoting and profiting from an industry that he helped foster, he also feels compelled to caution against its unfettered proliferation. He isn’t so much concerned about government agencies that use face recognition openly for specific purposes — for example, the many state motor vehicle departments that scan drivers’ faces as a way to prevent license duplications and fraud. Rather, what troubles him is the potential exploitation of face recognition to identify ordinary and unwitting citizens as they go about their lives in public. Online, we are all tracked. But to Dr. Atick, the street remains a haven, and he frets that he may have abetted a technology that could upend the social order. © 2014 The New York Times Company
Link ID: 19630 - Posted: 05.18.2014
By ALAN SCHWARZ ATLANTA — More than 10,000 American toddlers 2 or 3 years old are being medicated for attention deficit hyperactivity disorder outside established pediatric guidelines, according to data presented on Friday by an official at the Centers for Disease Control and Prevention. The report, which found that toddlers covered by Medicaid are particularly prone to be put on medication such as Ritalin and Adderall, is among the first efforts to gauge the diagnosis of A.D.H.D. in children below age 4. Doctors at the Georgia Mental Health Forum at the Carter Center in Atlanta, where the data was presented, as well as several outside experts strongly criticized the use of medication in so many children that young. The American Academy of Pediatrics standard practice guidelines for A.D.H.D. do not even address the diagnosis in children 3 and younger — let alone the use of such stimulant medications, because their safety and effectiveness have barely been explored in that age group. “It’s absolutely shocking, and it shouldn’t be happening,” said Anita Zervigon-Hakes, a children’s mental health consultant to the Carter Center. “People are just feeling around in the dark. We obviously don’t have our act together for little children.” Dr. Lawrence H. Diller, a behavioral pediatrician in Walnut Creek, Calif., said in a telephone interview: “People prescribing to 2-year-olds are just winging it. It is outside the standard of care, and they should be subject to malpractice if something goes wrong with a kid.” Friday’s report was the latest to raise concerns about A.D.H.D. diagnoses and medications for American children beyond what many experts consider medically justified. Last year, a nationwide C.D.C. survey found that 11 percent of children ages 4 to 17 have received a diagnosis of the disorder, and that about one in five boys will get one during childhood. A vast majority are put on medications such as methylphenidate (commonly known as Ritalin) or amphetamines like Adderall, which often calm a child’s hyperactivity and impulsivity but also carry risks for growth suppression, insomnia and hallucinations. Only Adderall is approved by the Food and Drug Administration for children below age 6. However, because off-label use of methylphenidate in preschool children had produced some encouraging results, the most recent American Academy of Pediatrics guidelines authorized it in 4- and 5-year-olds — but only after formal training for parents and teachers to improve the child’s environment were unsuccessful. © 2014 The New York Times Company
|By Andrea Anderson Our knack for language helps us structure our thinking. Yet the ability to wax poetic about trinkets, tools or traits may not be necessary to think about them abstractly, as was once suspected. A growing body of evidence suggests nonhuman animals can group living and inanimate things based on less than obvious shared traits, raising questions about how creatures accomplish this task. In a study published last fall in the journal PeerJ, for example, Oakland University psychology researcher Jennifer Vonk investigated how well four orangutans and a western lowland gorilla from the Toronto Zoo could pair photographs of animals from the same biological groups. Vonk presented the apes with a touch-screen computer and got them to tap an image of an animal—for instance, a snake—on the screen. Then she showed each ape two side-by-side animal pictures: one from the same category as the animal in the original image and one from another—for example, images of a different reptile and a bird. When they correctly matched animal pairs, they received a treat such as nuts or dried fruit. When they got it wrong, they saw a black screen before beginning the next trial. After hundreds of such trials, Vonk found that all five apes could categorize other animals better than expected by chance (although some individuals were better at it than others). The researchers were impressed that the apes could learn to classify mammals of vastly different visual characteristics together—such as turtles and snakes—suggesting the apes had developed concepts for reptiles and other categories of animals based on something other than shared physical traits. Dogs, too, seem to have better than expected abstract-thinking abilities. They can reliably recognize pictures of other dogs, regardless of breed, as a study in the July 2013 Animal Cognition showed. The results surprised scientists not only because dog breeds vary so widely in appearance but also because it had been unclear whether dogs could routinely identify fellow canines without the advantage of smell and other senses. Other studies have found feats of categorization by chimpanzees, bears and pigeons, adding up to a spate of recent research that suggests the ability to sort things abstractly is far more widespread than previously thought. © 2014 Scientific American
By DANIEL GOLEMAN Which will it be — the berries or the chocolate dessert? Homework or the Xbox? Finish that memo, or roam Facebook? Such quotidian decisions test a mental ability called cognitive control, the capacity to maintain focus on an important choice while ignoring other impulses. Poor planning, wandering attention and trouble inhibiting impulses all signify lapses in cognitive control. Now a growing stream of research suggests that strengthening this mental muscle, usually with exercises in so-called mindfulness, may help children and adults cope with attention deficit hyperactivity disorder and its adult equivalent, attention deficit disorder. The studies come amid growing disenchantment with the first-line treatment for these conditions: drugs. In 2007, researchers at the University of California, Los Angeles, published a study finding that the incidence of A.D.H.D. among teenagers in Finland, along with difficulties in cognitive functioning and related emotional disorders like depression, were virtually identical to rates among teenagers in the United States. The real difference? Most adolescents with A.D.H.D. in the United States were taking medication; most in Finland were not. “It raises questions about using medication as a first line of treatment,” said Susan Smalley, a behavior geneticist at U.C.L.A. and the lead author. In a large study published last year in The Journal of the American Academy of Child & Adolescent Psychiatry, researchers reported that while most young people with A.D.H.D. benefit from medications in the first year, these effects generally wane by the third year, if not sooner. “There are no long-term, lasting benefits from taking A.D.H.D. medications,” said James M. Swanson, a psychologist at the University of California, Irvine, and an author of the study. “But mindfulness seems to be training the same areas of the brain that have reduced activity in A.D.H.D.” © 2014 The New York Times Company
By DOLLY CHUGH, KATHERINE L. MILKMAN and MODUPE AKINOLA IN the world of higher education, we professors like to believe that we are free from the racial and gender biases that afflict so many other people in society. But is this self-conception accurate? To find out, we conducted an experiment. A few years ago, we sent emails to more than 6,500 randomly selected professors from 259 American universities. Each email was from a (fictional) prospective out-of-town student whom the professor did not know, expressing interest in the professor’s Ph.D. program and seeking guidance. These emails were identical and written in impeccable English, varying only in the name of the student sender. The messages came from students with names like Meredith Roberts, Lamar Washington, Juanita Martinez, Raj Singh and Chang Huang, names that earlier research participants consistently perceived as belonging to either a white, black, Hispanic, Indian or Chinese student. In total, we used 20 different names in 10 different race-gender categories (e.g. white male, Hispanic female). On a Monday morning, the emails went out — one email per professor — and then we waited to see which professors would write back to which students. We understood, of course, that some professors would naturally be unavailable or uninterested in mentoring. But we also knew that the average treatment of any particular type of student should not differ from that of any other — unless professors were deciding (consciously or not) which students to help on the basis of their race and gender. (This “audit” methodology has long been used to study intentional and unintentional bias in real-world decision-making, as it allows researchers to standardize much about the decision environment.) What did we discover? First comes the fairly good news, which we reported in a paper in Psychological Science. Despite not knowing the students, 67 percent of the faculty members responded to the emails, and remarkably, 59 percent of the responders even agreed to meet on the proposed date with a student about whom they knew little and who did not even attend their university. (We immediately wrote back to cancel those meetings.) © 2014 The New York Times Company
by Helen Thomson If you liked Inception, you're going to love this. People have been given the ability to control their dreams after a quick zap to their head while they sleep. Lucid dreaming is an intriguing state of sleep in which a person becomes aware that they are dreaming. As a result, they gain some element of control over what happens in their dream – for example, the dreamer could make a threatening character disappear or decide to fly to an exotic location. Researchers are interested in lucid dreaming because it can help probe what happens when we switch between conscious states, going from little to full awareness. In 2010, Ursula Voss at the J.W. Goethe University in Frankfurt, Germany, and her colleagues trained volunteers to move their eyes in a specific pattern during a lucid dream. By scanning their brains while they slept, Voss was able to show that lucid dreams coincided with elevated gamma brainwaves. This kind of brainwave occurs when groups of neurons synchronise their activity, firing together about 40 times a second. The gamma waves occurred mainly in areas situated towards the front of the brain, called the frontal and temporal lobes. Perchance to dream The team wanted to see whether gamma brainwaves caused the lucid dreams, or whether both were side effects of some other change. So Voss and her colleagues began another study in which they stimulated the brain of 27 sleeping volunteers, using a non-invasive technique called transcranial alternating current. © Copyright Reed Business Information Ltd.
Sam Kean For most of recorded history, human beings situated the mind — and by extension the soul — not within the brain but within the heart. When preparing mummies for the afterlife, for instance, ancient Egyptian priests removed the heart in one piece and preserved it in a ceremonial jar; in contrast, they scraped out the brain through the nostrils with iron hooks, tossed it aside for animals, and filled the empty skull with sawdust or resin. (This wasn’t a snarky commentary on their politicians, either—they considered everyone’s brain useless.) Most Greek thinkers also elevated the heart to the body’s summa. Aristotle pointed out that the heart had thick vessels to shunt messages around, whereas the brain had wispy, effete wires. The heart furthermore sat in the body’s center, appropriate for a commander, while the brain sat in exile up top. The heart developed first in embryos, and it responded in sync with our emotions, pounding faster or slower, while the brain just sort of sat there. Ergo, the heart must house our highest faculties. Meanwhile, though, some physicians had always had a different perspective on where the mind came from. They’d simply seen too many patients get beaned in the head and lose some higher faculty to think it all a coincidence. Doctors therefore began to promote a brain-centric view of human nature. And despite some heated debates over the centuries—especially about whether the brain had specialized regions or not—by the 1600s most learned men had enthroned the mind within the brain. A few brave scientists even began to search for that anatomical El Dorado: the exact seat of the soul within the brain. One such explorer was Swedish philosopher Emanuel Swedenborg, one of the oddest ducks to ever waddle across the stage of history. © 2014 Salon Media Group, Inc.
Link ID: 19601 - Posted: 05.12.2014
—By Indre Viskontas and Chris Mooney When the audio of Los Angeles Clippers owner Donald Sterling telling a female friend not to "bring black people" to his team's games hit the internet, the condemnations were immediate. It was clear to all that Sterling was a racist, and the punishment was swift: The NBA banned him for life. It was, you might say, a pretty straightforward case. When you take a look at the emerging science of what motivates people to behave in a racist or prejudiced way, though, matters quickly grow complicated. In fact, if there's one cornerstone finding when it comes to the psychological underpinnings of prejudice, it's that out-and-out or "explicit" racists—like Sterling—are just one part of the story. Perhaps far more common are cases of so-called "implicit" prejudice, where people harbor subconscious biases, of which they may not even be aware, but that come out in controlled psychology experiments. Much of the time, these are not the sort of people whom we would normally think of as racists. "They might say they think it's wrong to be prejudiced," explains New York University neuroscientist David Amodio, an expert on the psychology of intergroup bias. Amodio says that white participants in his studies "might write down on a questionnaire that they are positive in their attitudes towards black people…but when you give them a behavioral measure, of how they respond to pictures of black people, compared with white people, that's when we start to see the effects come out." You can listen to our interview with Amodio on the Inquiring Minds podcast below: Welcome to the world of implicit racial biases, which research suggests are all around us, and which can be very difficult for even the most well-intentioned person to control. ©2014 Mother Jones
By Diana Kwon Would you rather have $50 now or $100 two weeks from now? Even though the $100 is obviously the better choice, many people will opt for the $50. Both humans and animals show this tendency to place lower value on later rewards, a behavior known as temporal discounting. High rates of temporal discounting can lead to impulsive behavior, and at its worst, too much of this “now bias” is associated with pathological gambling, attention deficit hyperactivity disorder and drug addiction. What determines if you’ll be an impulsive decision-maker? New evidence suggests that for women, estrogen levels might be a factor. In a recent study published in the Journal of Neuroscience, Charlotte Boettiger and her team at the University of North Carolina revealed that greater increases in estrogen levels across the menstrual cycle led to less impulsive decision making. The researchers tested the “now bias” in 87 women between the ages of 18 and 40 at two different points in their menstrual cycle – in the menstrual phase when estrogen levels are low and the follicular phase when estrogen levels are high. Participants were given a delay-discounting task where they had to choose between two options: a certain sum of money at a later date or a discounted amount immediately (e.g. $100 in one week or $70 today). Subjects showed a greater bias toward the immediate choice during the menstrual phase of the cycle, when estrogen levels were low. Estrogen levels vary between women and can change with factors like stress and age. When the researchers measured amounts of estradiol (the dominant form of estrogen) from the saliva in a subset of the participants at the two points in their menstrual cycles, they found that not all of them showed a detectable increase. Only those with a measureable rise in estradiol showed a significant change in impulsive decision-making. © 2014 Scientific American