Chapter 2. Cells and Structures: The Anatomy of the Nervous System
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By Laura Sanders Studying the human brain requires grandiose thinking, but rarely do actual theatrical skills come into play. In her latest stint as a video star, MIT neuroscientist Nancy Kanwisher does not buzz saw her skull open to give viewers a glimpse of her brain. But she does perhaps the next best thing: She clips off her shoulder-length gray hair and shaves her head on camera. Kanwisher’s smooth, bald head then becomes a canvas for graduate student and artist Rosa Lafer-Sousa, who meticulously draws in the brain’s wrinkles — the sulci and the gyri that give rise to thoughts, memories and behaviors. All the while, Kanwisher provides a voice-over describing which areas of the brain recognize faces, process language and even think about what another person is thinking. The video is the latest in Kanwisher’s occasional online series, Nancy’s Brain Talks. Pithy, clever and cleanly produced, the more than two dozen videos she has made so far bring brain science to people who might otherwise miss out. In another neurostunt, brain-zapping technology called transcranial magnetic stimulation makes Kanwisher’s hand jump involuntarily. These demonstrations capture people’s attention more than a dry scientific paper would. “I think scientists owe it to the public to share the cool stuff we discover,” Kanwisher says. Her own lab’s discoveries focus on how the brain’s disparate parts work together to construct a mind. Some brain areas have very specific job descriptions while others are far more general. Compiling a tally of brain regions and figuring out what they do is one of the first steps toward understanding the brain. “It starts to give us a set of basic components of the mind,” Kanwisher says. “It’s like a parts list.” © Society for Science & the Public 2000 - 2015.
Keyword: Brain imaging
Link ID: 20853 - Posted: 04.28.2015
Jon Hamilton The simple act of thinking can accelerate the growth of many brain tumors. That's the conclusion of a paper in Cell published Thursday that showed how activity in the cerebral cortex affected high-grade gliomas, which represent about 80 percent of all malignant brain tumors in people. "This tumor is utilizing the core function of the brain, thinking, to promote its own growth," says Michelle Monje, a researcher and neurologist at Stanford who is the paper's senior author. In theory, doctors could slow the growth of these tumors by using sedatives or other drugs to reduce mental activity, Monje says. But that's not a viable option because it wouldn't eliminate the tumor and "we don't want to stop people with brain tumors from thinking or learning or being active." Even so, the discovery suggests other ways to slow down some of the most difficult brain tumors, says Tracy Batchelor, who directs the neuro-oncology program at Massachusetts General Hospital and was not involved in the research. "We really don't have any curative treatments for high-grade gliomas," Batchelor says. The discovery of a link between tumor growth and brain activity "has opened up a window into potential therapeutic interventions," he says. The discovery came from a team of scientists who studied human glioma tumors implanted in mouse brains. The scientists used a technique called optogenetics, which uses light to control brain cells, to increase the activity of cells near the tumors. © 2015 NPR
Link ID: 20846 - Posted: 04.25.2015
By Rachel Feltman This is either fascinating, incredibly creepy, or both. Probably both. But also science! The video wasn't created for an all-MRI production of "The Wizard of Oz." It's an example of a high-speed, high-resolution MRI technique. The technique, which is being developed by the Bioimaging Science and Technology Group at the Beckman Institute, acquires about 100 frames per second. A description of the technique was published Tuesday in the journal Magnetic Resonance in Medicine. Working about 10 times faster than a standard MRI, the machine was able to pick up the muscular nuances required for singing. You can see the vocal folds hard at work creating the tune. These two flaps inside the larynx sit over the windpipe, coming together whenever we're not breathing. Air passes through the closed folds, causing them to vibrate. We use our larynx to control the tension of our vocal folds, which changes the pitch of our vocalizations. The researchers weren't just goofing off in order to display the MRI's capabilities: The high-speed and high-resolution images help them keep tabs on the tongue and neck muscles during vocalization. They're hoping to learn more about what health vocalization looks like, and whether or not singing can be used as a therapy to help the elderly regain more control over their speech.
Keyword: Brain imaging
Link ID: 20838 - Posted: 04.23.2015
By Antonio Regalado Various powerful new tools for exploring and manipulating the brain have been developed over the last few years. Some use electronics, while others use light or chemicals. At one MIT lab, materials scientist Polina Anikeeva has hit on a way to manufacture what amounts to a brain-science Swiss Army knife. The neural probes she builds carry light while collecting and transmitting electricity, and they also have tiny channels through which to pump drugs. That’s an advance over metal wires or silicon electrodes conventionally used to study neurons. Anikeeva makes the probes by assembling polymers and metals into large-scale blocks, or preforms, and then stretching them into flexible, ultrathin fibers. Multifunctional fibers offer new ways to study animal behavior, since they can record from neurons as well as stimulating them. New types of medical technology could also result. Imagine, as Anikeeva does, bionic wiring that bridges a spinal-cord injury, collecting electrical signals from the brain and transmitting them to the muscles of a paralyzed hand. Anikeeva made her first multifunctional probe while studying at Stanford. It was crude: she simply wrapped metal wires around a glass filament. But this made it possible to combine standard electrode measurements with a new technology, optogenetics, in which light is fired at neurons to activate them or shut them down.
Keyword: Brain imaging
Link ID: 20832 - Posted: 04.22.2015
By Neuroskeptic According to a large study just published in the Journal of Autism and Developmental Disorders, there’s no correlation between brain anatomy and self-reported autistic traits. Dutch researchers P. Cedric M. P. Koolschijn and colleagues looked at two samples of young Dutch adults: an ‘exploration’ sample of 204, and a separate ‘validation’ group of 304 individuals. Most of the participants did not have autism. The researchers looked for associations between various aspects of brain structure and autistic traits, using the AQ questionnaire, a popular self-report measure. Autistic traits are personality or behavior features similar to (but generally milder than) autism symptoms. For example, the first item on the AQ is “I prefer to do things with others rather than on my own.” If you disagree with that, you get a point. More points means more autistic traits. Koolschijn et al. used VBM, vertex-based cortical thickness analysis, and diffusion weighted imaging to explore different aspects of brain grey and white matter anatomy. However, although AQ scores were weakly correlated with the volume of a few brain areas in the exploration sample, none of these correlations were confirmed in the larger validation sample, suggesting that they were just false positives caused by the large number of multiple comparisons.
By KEN BELSON The developers of a new drug aimed at diagnosing chronic traumatic encephalopathy, a degenerative brain disease linked to repeated head trauma, are under scrutiny by the Food and Drug Administration. In February, the F.D.A.’s Office of Prescription Drug Promotion sent a letter to two researchers at U.C.L.A. warning them that they had improperly marketed their drug on the Internet and had made overstated claims about the drug’s potential efficacy. The researchers at U.C.L.A. have been developing a biomarker called FDDNP, which aims to identify tau protein deposits in the brain (a signature of C.T.E.) when patients are given a PET scan. To date, researchers have been able to detect C.T.E. only in brain tissue obtained posthumously. The demand for a technique that can diagnose the disease in living patients is potentially large, given growing concerns about the impact of head trauma in athletes, soldiers and others. In its letter, the F.D.A. warned that the researchers, who are partners with the company Taumark, were not allowed to market the drug and make claims about its safety or effectiveness. “Thus, these claims and presentations suggest in a promotional context that FDDNP, an investigational new drug, is safe or effective for such uses, when F.D.A. has not approved FDDNP for any use,” the letter said. The Los Angeles Times first reported the details of the F.D.A.’s letter to the researchers, Dr. Gary Small and Dr. Jorge Barrio. The researchers were told to adjust the language on Taumark’s website, which is now disabled. © 2015 The New York Times Company
by Anil Ananthaswamy HOLD that thought. When it comes to consciousness, the brain may be doing just that. It now seems that conscious perception requires brain activity to hold steady for hundreds of milliseconds. This signature in the pattern of brainwaves can be used to distinguish between levels of impaired consciousness in people with brain injury. The new study by Aaron Schurger at the Swiss Federal Institute of Technology in Lausanne doesn't explain the so-called "hard problem of consciousness" – how roughly a kilogram of nerve cells is responsible for the miasma of sensations, thoughts and emotions that make up our mental experience. However, it does chip away at it, and support the idea that it may one day be explained in terms of how the brain processes information. Neuroscientists think that consciousness requires neurons to fire in such a way that they produce a stable pattern of brain activity. The exact pattern will depend on what the sensory information is, but once information has been processed, the idea is that the brain should hold a pattern steady for a short period of time – almost as if it needs a moment to read out the information. In 2009, Schurger tested this theory by scanning 12 people's brains with fMRI machines. The volunteers were shown two images simultaneously, one for each eye. One eye saw a red-on-green line drawing and the other eye saw green-on-red. This confusion caused the volunteers to sometimes consciously perceive the drawing and sometimes not. © Copyright Reed Business Information Ltd.
Mo Costandi In 2009, researchers at the University of California, Santa Barbara performed a curious experiment. In many ways, it was routine — they placed a subject in the brain scanner, displayed some images, and monitored how the subject's brain responded. The measured brain activity showed up on the scans as red hot spots, like many other neuroimaging studies. Except that this time, the subject was an Atlantic salmon, and it was dead. Dead fish do not normally exhibit any kind of brain activity, of course. The study was a tongue-in-cheek reminder of the problems with brain scanning studies. Those colorful images of the human brain found in virtually all news media may have captivated the imagination of the public, but they have also been subject of controversy among scientists over the past decade or so. In fact, neuro-imagers are now debating how reliable brain scanning studies actually are, and are still mostly in the dark about exactly what it means when they see some part of the brain "light up." Functional magnetic resonance imaging (fMRI) measures brain activity indirectly by detecting changes in the flow of oxygen-rich blood, or the blood oxygen-level dependent (BOLD) signal, with its powerful magnets. The assumption is that areas receiving an extra supply of blood during a task have become more active. Typically, researchers would home in on one or a few "regions of interest," using 'voxels,' tiny cube-shaped chunks of brain tissue containing several million neurons, as their units of measurement.
Keyword: Brain imaging
Link ID: 20775 - Posted: 04.10.2015
By KEN BELSON One of the limitations of studying chronic traumatic encephalopathy, or C.T.E., the degenerative brain disease linked to repeated head trauma, has been that researchers have been able to detect it only in tissue obtained posthumously. A study published Monday by Proceedings of the National Academy of Sciences, though, suggests that researchers trying to develop a test that will detect the disease in living patients have taken a small step forward. The study, conducted at U.C.L.A., included 14 retired N.F.L. players who suffered from mood swings, depression and cognitive problems associated with C.T.E. The players were given PET, or positron emission tomography, scans that revealed tau protein deposits in their brains, a signature of C.T.E. Although the results were not conclusive, the distribution of tau in their brains was consistent with those found in the autopsies of players who had C.T.E. The 14 players were compared with 24 patients with Alzheimer’s disease and 28 patients in a control group with no significant cognitive problems. The scans showed that the tau deposits in the 14 players were “distinctly different” from those in the patients with Alzheimer’s disease. “There seems to be an emerging new pattern we haven’t seen in any known forms of dementia, and it is definitely not normal,” said Dr. Julian Bailes, a coauthor of the study and the chairman of neurosurgery at NorthShore Neurological Institute in Evanston, Ill. © 2015 The New York Times Company
Helen Shen An ambitious plan is afoot to build the world’s largest public catalogue of neuronal structures. The BigNeuron project, announced on 31 March by the Allen Institute for Brain Science in Seattle, Washington, is designed to help researchers to simulate and understand the human brain. The project might also push neuroscientists to wrestle with fundamental — sometimes even emotional — questions about how to classify neurons. It is the era of the mega-scale brain initiative: Europe’s Human Brain Project aims to model the human brain in a supercomputer, and the US BRAIN Initiative hopes to unravel how networks of neurons work together to produce thoughts and actions. Standing in the way of these projects is a surprising limitation. “We still don’t know how many classes of neurons are in the brain,” says neuroscientist Rafael Yuste at Columbia University in New York City. BigNeuron aims to generate detailed descriptions of tens of thousands of individual neurons from various species, including fruit flies, zebrafish, mice and humans, and to suggest the best computer algorithms for extracting the finely branched shapes of these cells from microscopy data — a difficult and error-prone process. Getting the details of the shapes right is crucial to accurately modelling the behaviour of neurons: their geometry helps to determine how they process and transmit information through electrical and chemical signals. © 2015 Nature Publishing Group
Keyword: Brain imaging
Link ID: 20746 - Posted: 04.01.2015
By Emily Underwood Shielded by the skull and packed with fatty tissue, the living brain is perhaps the most difficult organ for scientists to probe. Functional magnetic resonance imaging (fMRI), which noninvasively measures changes in blood flow and oxygen consumption as a proxy for neuronal activation, lags far behind the actual speed of thought. Now, a new technique may provide the fastest yet method of measuring blood flow in the brain, scientists report online today in Nature Methods. The technique, which bounces laser beams off red blood cells, has a resolution of under a millisecond—slightly less time than it takes a neuron to fire—and it has a far higher spatial resolution than fMRI. Even the most powerful fMRI machines, used only on animals, can image only millimeter-wide swaths of tissues including thousands of cells. The new technique, which takes its measurements from sonic waves produced by the beams, can image structures as small as individual blood vessels and cells (see above). Although the technique is not likely to be feasible in humans due to safety concerns, it could provide an important tool to better understand how blood flow and oxygen consumption is related to brain activity. That’s a key question for those relying on cruder and safer tools, such as fMRI, to study the human brain, researchers say. It is also a powerful tool for studying how errant eddies and whorls of blood in blood vessels can sometimes lead to stroke, they say. © 2015 American Association for the Advancement of Science
Keyword: Brain imaging
Link ID: 20735 - Posted: 03.31.2015
Just like the human brain itself, the European Commission’s billion-euro Human Brain Project (HBP) defies easy explanation. Launched 18 months ago, the massive project is complex and, to most observers, confusing. Many people—both scientists and non-scientists—have thus accepted a description of the project that emerged from its leaders and its publicity machine: the aim of simulating the entire human brain in a supercomputer and so find cures for psychiatric and neurological disorders. Like many simplistic explanations of the brain, that characterization of the project provoked a backlash from neuroscientists. This climaxed in a full-scale uprising last summer, when hundreds of researchers signed a critical open letter to the commission (www.neurofuture.eu). Autocratic management, they complained, was running the project off its scientific course and exaggerating its clinical reach. An independent committee was established to investigate and mediate on the dispute. Last week it published its report. This time, the main points were easier for outsiders to decipher. The rebellious neuroscientists who made the complaints were correct. The brain project is failing and must be fixed. The committee’s criticisms endorse more or less all the concerns of the scientists. The project fails not only in its governance, the report says, but also in its scientific plan—particularly the core aim, the simulation of the entire brain that critics had long dismissed as unrealistic. © 2015 Scientific American
Keyword: Brain imaging
Link ID: 20730 - Posted: 03.30.2015
Mo Costandi Two teams of scientists have developed new ways of stimulating neurons with nanoparticles, allowing them to activate brain cells remotely using light or magnetic fields. The new methods are quicker and far less invasive than other hi-tech methods available, so could be more suitable for potential new treatments for human diseases. Researchers have various methods for manipulating brain cell activity, arguably the most powerful being optogenetics, which enables them to switch specific brain cells on or off with unprecedented precision, and simultaneously record their behaviour, using pulses of light. This is very useful for probing neural circuits and behaviour, but involves first creating genetically engineered mice with light-sensitive neurons, and then inserting the optical fibres that deliver light into the brain, so there are major technical and ethical barriers to its use in humans. Nanomedicine could get around this. Francisco Bezanilla of the University of Chicago and his colleagues knew that gold nanoparticles can absorb light and convert it into heat, and several years ago they discovered that infrared light can make neurons fire nervous impulses by heating up their cell membranes. They therefore attached gold nanorods to three different molecules that recognise and bind to proteins in the cell membranes – the scorpion toxin Ts1, which binds to a sodium channel involved in producing nervous impulses, and antibodies that bind the P2X3 and the TRPV1 channels, both found in dorsal root ganglion (DRG) neurons, which transmit touch and pain information up the spinal cord and into the brain. © 2015 Guardian News and Media Limited
Keyword: Brain imaging
Link ID: 20717 - Posted: 03.25.2015
By JENEEN INTERLANDI Nyiregyhaza (pronounced NEAR-re-cha-za) is a medium-size city tucked into the northeastern corner of Hungary, about 60 miles from the Ukrainian border. It has a world-class zoo, several museums and universities and a new Lego Factory. It also has two Roma settlements, or “Gypsy ghettos.” The larger of these settlements is Gusev, a crumbling 19th-century military barracks separated from the city proper by a railway station and a partly defunct industrial zone. Gusev is home to more than 1,000 Roma. Its chief amenities include a small grocery store and a playground equipped with a lone seesaw and a swingless swing set. There’s also a freshly painted elementary school, where approximately 60 students are currently enrolled. Almost all those students are Roma and almost all of them live in Gusev. Officially, most of the schools in Nyiregyhaza are integrated. Roma students have access to the same facilities as non-Roma students, and the ethnic balance of any given facility largely reflects the ethnic balance of the neighborhoods it serves. In practice, things are muddier. While many families in Gusev have been assigned to perfectly reputable schools, there is no busing program, and most schools are not within walking distance. For families living on just 60,000 forints ($205) a month, the schools are also too expensive to reach by public transit. “Everything is fine on paper,” Adel Kegye, an attorney with the Chance for Children Foundation (C.F.C.F.), told me when I visited Hungary this past fall. “But in reality, they make it very hard for the Roma to go anywhere but the settlement school.” ..... In the past two decades, with the advent of f.M.R.I. technology, neuroscientists also began to tackle such questions. Emile Bruneau, a cognitive neuroscientist at the Massachusetts Institute of Technology, has spent the past seven years studying intractable conflicts around the world. © 2015 The New York Times Company
By Martin Enserink The Human Brain Project (HBP) has listened to the critics, the reviewers, and the mediators. At a meeting in Paris, the board of directors of the €1 billion project yesterday approved a series of recommendations for reform, proposed by a mediation committee, which will change both HBP’s governance and its research program. Critics of the troubled project welcome the move. “We are absolutely delighted that the board has adopted these recommendations,” says computational neuroscientist Peter Dayan of University College London, one of the hundreds of researchers who signed an open letter last year calling for a major reorganization of HBP. Dayan was a member of the mediation committee charged with finding a way out of the crisis after the publication of the letter. That panel’s report—a summary of which was released on 10 March—roundly acknowledges that the critics were right. The committee “largely supports and emphasizes the critique voiced by parts of the scientific community regarding objectives, scientific approach, governance and management practices,” the report says. The mediation committee said that HBP, now administered by the Swiss Federal Institute of Technology in Lausanne (EPFL), should be run by a new, international entity. “In a first concrete step towards implementing that vision, the board [of directors] has created a governance working group composed of former or current heads of international scientific organisations,” an HBP press release issued today said. (They include CERN, the European Space Agency, and the European Molecular Biology Laboratory.) © 2015 American Association for the Advancement of Science
Keyword: Brain imaging
Link ID: 20704 - Posted: 03.21.2015
Alison Abbott Mediators appointed to analyse the rifts within Europe’s ambitious €1-billion (US$1.1-billion) Human Brain Project (HBP) have called for far-reaching changes both in its governance and its scientific programmes. Most significantly, the report recommends that systems neuroscience and cognitive neuroscience should be reinstated into the HBP. The mediation committee, led by engineer Wolfgang Marquardt, director of Germany’s national Jülich Research Centre, sent its final report to the HBP board of directors on 9 March, and issued a press release summarizing its findings. (The full report will not be published until after the board, a 22-strong team of scientists, discusses its contents at a meeting on 17–18 March). The European Commission flagship project, which launched in October 2013, is intended to boost supercomputing through neuroscience, with the aim of simulating the brain in a computer. But the project has been racked by dissent from the outset. In early 2014, a three-person committee of scientists who ran the HBP’s scientific direction revealed that they planned to eliminate cognitive neuroscience from the initiative, which precipitated a mass protest. More than 150 of Europe’s leading neuroscientists signed a letter to the European Commission, complaining about the project’s management and charging that the HBP plan to simulate the brain using only ‘bottom-up’ data on the behaviour of neurons was doomed to failure if it did not include the top-down constraints provided by systems and cognitive neuroscience. © 2015 Nature Publishing Group
Keyword: Brain imaging
Link ID: 20670 - Posted: 03.10.2015
In Archaeology it is very rare to find any soft tissue remains: no skin, no flesh, no hair and definitely no brains. However, in 2009, archaeologists from York Archaeological Trust found something very surprising at a site in Heslington, York. During the excavation of an Iron-age landscape at the University of York, a skull, with the jaw and two vertebrae still attached, was discovered face down in a pit, without any evidence of what had happened to the rest of its body. At first it looked like a normal skull but it was not until it was being cleaned, that Collection Projects Officer, Rachel Cubitt, discovered something loose inside. “I peered though the hole at the base of the skull to investigate and to my surprise saw a quantity of bright yellow spongy material. It was unlike anything I had seen before.” says Rachel. Sonia O’Connor, from Archaeological Sciences, University of Bradford, was able to confirm that this was brain. With the help of York Hospital’s Mortuary they were able to remove the top of the skull in order to get their first look at this astonishingly well-preserved human brain. Since the discovery, a team of 34 specialists have been working on this brain to study and conserve it as much as possible. By radiocarbon dating a sample of jaw bone, it was determined that this person probably lived in the 6th Century BC, which makes this brain about 2,600 years old. By looking at the teeth and the shape of the skull it is likely this person was a man between 26 and 45 years old. An examination of the vertebrae in the neck tells us that he was first hit hard on the neck, and then the neck was severed with a small sharp knife, for reasons we can only guess. © Copyright York Archaeological Trust 2013-2015.
Keyword: Brain imaging
Link ID: 20657 - Posted: 03.07.2015
Alison Abbott Europe’s ambitious but contentious €1-billion Human Brain Project (HBP) has announced changes to its organization in a response to criticisms of its management and scientific trajectory by many high-ranking neuroscientists. On 26 February, the HBP's Board of Directors voted narrowly to disband the three-person executive committee that had run the project, which launched in October 2013 and is intended to boost digital technologies such as supercomputing through collaboration with neuroscience. That decision is expected to be endorsed by HBP’s 85 or so partner universities and research institutes by the end of this week. The revamp comes seven months after 150 top neuroscientists signed a protest letter to the European Commission, charging, among other things, that the committee was acting autocratically and running the project's scientific plans off course. Led by the charismatic but divisive figure of Henry Markram, a neuroscientist at the Swiss Federal Institute of Technology in Lausanne (EPFL) which coordinates the HBP, the committee had stirred up anger last spring when it revealed plans to cut cognitive neuroscience from the initiative. The neuroscientists vowed to boycott the HBP's future phases if their concerns were ignored. An independent mediation committee was established to look into the charges and make recommendations. Its report, which is expected to further shake up the HBP's management, will be published in the next few weeks. In the meantime, the three-person committee's responsibilities will be taken on by the HBP's Board of Directors (currently a 22-strong team of scientists that includes the disbanded executive committee, although they do not have voting rights). © 2015 Nature Publishing Group
Keyword: Brain imaging
Link ID: 20651 - Posted: 03.05.2015
By Roni Caryn Rabin When my mother, Pauline, was 70, she lost her sense of balance. She started walking with an odd shuffling gait, taking short steps and barely lifting her feet off the ground. She often took my hand, holding it and squeezing my fingers. Her decline was precipitous. She fell repeatedly. She stopped driving, and she could no longer ride her bike in a straight line along the C&O Canal. The woman who taught me the sidestroke couldn’t even stand in the shallow end of the pool. “I feel like I’m drowning,” she’d say. A retired psychiatrist, my mother had numerous advantages — education, resources and insurance — but, still, getting the right diagnosis took nearly 10 years. Each expert saw the problem through the narrow prism of a single specialty. Surgeons recommended surgery. Neurologists screened for common incurable conditions. The answer was under their noses, in my mother’s hunches and her family history. But it took a long time before someone connected the dots. My mother was using a walker by the time she was told she had a rare condition that causes gait problems and cognitive loss, and is one of the few treatable forms of dementia. The bad news was that it had taken so long to get the diagnosis that some of the damage might not be reversible. “This should be one of the first things physicians look for in an older person,” my mother said recently. “You can actually do something about it.”
Link ID: 20643 - Posted: 03.03.2015
By Christian Jarrett Imagine a politician from your party is in trouble for alleged misdemeanors. He’s been assessed by an expert who says he likely has early-stage Alzheimer’s. If this diagnosis is correct, your politician will have to resign, and he’ll be replaced by a candidate from an opposing party. This was the scenario presented to participants in a new study by Geoffrey Munro and Cynthia Munro. A vital twist was that half of the 106 student participants read a version of the story in which the dementia expert based his diagnosis on detailed cognitive tests; the other half read a version in which he used a structural MRI brain scan. All other story details were matched, such as the expert’s years of experience in the field, and the detail provided for the different techniques he used. Overall, the students found the MRI evidence more convincing than the cognitive tests. For example, 69.8 percent of those given the MRI scenario said the evidence the politician had Alzheimer’s was strong and convincing, whereas only 39.6 percent of students given the cognitive tests scenario said the same. MRI data was also seen to be more objective, valid and reliable. Focusing on just those students in both conditions who showed skepticism, over 15 percent who read the cognitive tests scenario mentioned the unreliability of the evidence; none of the students given the MRI scenario cited this reason. In reality, a diagnosis of probable Alzheimer’s will always be made with cognitive tests, with brain scans used to rule out other explanations for any observed test impairments. The researchers said their results are indicative of naive faith in the trustworthiness of brain imaging data. “When one contrasts the very detailed manuals accompanying cognitive tests to the absences of formalized operational criteria to guide the clinical interpretation of structural brain MRI in diagnosing disease, the perception that brain MRI is somehow immune to problems of reliability becomes even more perplexing,” they said. WIRED.com © 2015 Condé Nast.