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      The N.F.L. Now Allows Helmet Caps

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      Do they work?Now that the N.F.L. season has begun, you may have noticed football players wearing a strange sort of cover over their helmets. It’s called a Guardian Cap, and it adds a layer of foam to the outside of the helmet, with the aim of reducing brain injuries.N.F.L. players have worn the caps during summer practice for the past few years, but this is the first season the league is allowing them in games. A handful of players wore them during the opening weekend.The company behind the caps, Guardian Sports, says they reduce the force of the impact when a player’s head is hit. But what does that mean? And do they protect against concussions?Erin Hanson, Guardian’s founder and owner, said an N.F.L. study found that when players used Guardian helmet caps in practice, the number of concussions fell by more than 50 percent.Yet, Guardian also has a disclaimer on its website: “No helmet, practice apparatus or helmet pad can prevent or eliminate the risk of concussions or other serious head injuries while playing sports. Researchers have not reached an agreement on how the results of impact absorption tests relate to concussions.”In a telephone interview, Hanson emphasized that it was unrealistic to think that the cap would prevent all concussions.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

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      Do You Have Healthy Brain Habits? Take This Quiz to Find Out.

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      What can I do to take good care of my brain and lower my risk for a neurological disease? That’s the No. 1 question neurologist Dr. Jonathan Rosand hears from his patients (and their family members) at the Massachusetts General Hospital McCance Center for Brain Health. To help answer it, he and his colleagues, with […] More

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      A Personalized Brain Pacemaker for Parkinson’s

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      When Shawn Connolly was diagnosed with Parkinson’s disease nine years ago, he was a 39-year-old daredevil on a skateboard, flipping and leaping from walls, benches and dumpsters through the streets of San Francisco. He appeared in videos and magazines, and had sponsorships from skateboard makers and shops.But gradually, he began to notice that “things weren’t really working right” with his body. He found that his right hand was cupping, and he began cradling his arm to hold it in place. His balance and alignment started to seem off.Over time, he developed a common Parkinson’s pattern, fluctuating between periods of rapid involuntary movements like “I’ve got ants in my pants” and periods of calcified slowness when, he said, “I could barely move.”A couple of years ago, Mr. Connolly volunteered for an experiment that summoned his daring and determination in a different way. He became a participant in a study exploring an innovative approach to deep brain stimulation.In the study, which was published Monday in the journal Nature Medicine, researchers transformed deep brain stimulation — an established treatment for Parkinson’s — into a personalized therapy that tailored the amount of electrical stimulation to each patient’s individual symptoms.The researchers found that for Mr. Connolly and the three other participants, the individualized approach, called adaptive deep brain stimulation, cut in half the time they experienced their most bothersome symptom.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

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      How to Exercise to Improve Your Mood

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      Physical activity can brighten your outlook and calm your nerves — if you do it strategically.We’ve all encountered that person who comes back from the gym or a run seemingly high on life. In fact, scientists say that even a single bout of exercise can alter your neurochemistry in ways that create feelings of hope, calm, connection and a generally better mood.But for others, a workout just leaves them feeling worn out.“It’s normal not to find exercise rewarding,” said Daniel Lieberman, an evolutionary biologist at Harvard University. “There’s nothing wrong with you.”While some people are simply more genetically or psychologically inclined to enjoy exercise, recent discoveries have helped experts understand why it can be such a high. And, they say, by making a few changes to your workout, you can train your body and mind to find exercise more pleasurable.It’s not just about endorphins.Scientists once thought the rush people felt from exercise came exclusively from endorphins, which act like natural opioids in the brain by relieving pain. But in recent decades, researchers have discovered a more complex cocktail of other key “feel-good” chemicals produced during movement.Each ingredient plays a distinct but complementary role, said Julia Basso, an assistant professor at Virginia Tech who runs a lab studying the effects of exercise on the brain. “These neurochemicals are really working in tandem,” she said.The most potent players appear to be endocannabinoids, which share similar molecular structure with THC, and bind to the same receptors in the brain — giving you that buzzy feeling that all is right in the world.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

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      A Blood Test Accurately Diagnosed Alzheimer’s 90% of the Time, Study Finds

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      It was much more accurate than primary care doctors using cognitive tests and CT scans. The findings could speed the quest for an affordable and accessible way to diagnose patients with memory problems.Scientists have made another major stride toward the long-sought goal of diagnosing Alzheimer’s disease with a simple blood test. On Sunday, a team of researchers reported that a blood test was significantly more accurate than doctors’ interpretation of cognitive tests and CT scans in signaling the condition.The study, published Sunday in the journal JAMA, found that about 90 percent of the time the blood test correctly identified whether patients with memory problems had Alzheimer’s. Dementia specialists using standard methods that did not include expensive PET scans or invasive spinal taps were accurate 73 percent of the time, while primary care doctors using those methods got it right only 61 percent of the time.“Not too long ago measuring pathology in the brain of a living human was considered just impossible,” said Dr. Jason Karlawish, a co-director of the Penn Memory Center at the University of Pennsylvania who was not involved in the research. “This study adds to the revolution that has occurred in our ability to measure what’s going on in the brain of living humans.”The results, presented Sunday at the Alzheimer’s Association International Conference in Philadelphia, are the latest milestone in the search for affordable and accessible ways to diagnose Alzheimer’s, a disease that afflicts nearly seven million Americans and over 32 million people worldwide. Medical experts say the findings bring the field closer to a day when people might receive routine blood tests for cognitive impairment as part of primary care checkups, similar to the way they receive cholesterol tests.“Now, we screen people with mammograms and PSA or prostate exams and other things to look for very early signs of cancer,” said Dr. Adam Boxer, a neurologist at the University of California, San Francisco, who was not involved in the study. “And I think we’re going to be doing the same thing for Alzheimer’s disease and hopefully other forms of neurodegeneration.”In recent years, several blood tests have been developed for Alzheimer’s. They are currently used mostly to screen participants in clinical trials and by some specialists like Dr. Boxer to help pinpoint if a patient’s dementia is caused by Alzheimer’s or another condition.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

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      Army Sees No Link to Blast Exposure in Maine Gunman’s Mental Issues

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      Investigators found lapses in the handling of a troubled reservist who went on to kill 18 people, but they rejected suggestions that his Army work had damaged his brain.An Army investigation into the October 2023 mass shooting committed by an Army Reserve soldier, Robert Card II, found that a number of factors contributed to the Army’s inaction as Mr. Card’s mental health careened toward violence, including procedural breakdowns, missteps by commanders and rules that restrict military authority over reserve soldiers when they are out of uniform.But the report said the Army saw no link between his mental health problems and the years he spent working as a grenade instructor, repeatedly exposed to explosions on the practice range.Every summer for eight years, Mr. Card taught cadets at the U.S. Military Academy at West Point to use heavy weapons, including machine guns and shoulder-fired anti-tank guns. For five of those years, he worked on the grenade range, where about 2,400 grenades exploded over a two-week period. By age 40, he wore hearing aids.Last July, he was supposed to run machine-gun training for cadets, despite having missed a mandatory training session in the spring, the report said. But he was behaving so erratically in July that his Army Reserve commander had him hospitalized at a civilian psychiatric hospital in New York.Lt. Gen. Jody J. Daniels said the blasts Robert Card II had experienced in his Army Reserve service were “relatively minor.” The general administered an oath to new service members at a football game in 2022.Julio Cortez/Associated PressThe hospital determined that Mr. Card was experiencing psychosis and homicidal thoughts and had a “hit list.” Doctors moved to commit the soldier involuntarily for treatment, but the effort was dropped by the hospital under what the Army report called “questionable circumstances,” and Mr. Card was released after 19 days.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

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      This Is Literally Your Brain on Drugs

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      A small new study shows reactions in the brain in people who were given psilocybin in a controlled setting.If you had to come up with a groovy visualization of the human brain on psychedelic drugs, it might look something like this.Sara Moser/Washington University School of MedicineThe image, as it happens, comes from dozens of brain scans produced by researchers at Washington University School of Medicine in St. Louis who gave psilocybin, the compound in “magic mushrooms,” to participants in a study before sending them into a functional M.R.I. scanner.The kaleidoscopic whirl of colors they recorded is essentially a heat map of brain changes, with the red, orange and yellow hues reflecting a significant departure from normal activity patterns. The blues and greens reflect normal brain activity that occurs in the so-called functional networks, the neural communication pathways that connect different regions of the brain.The scans, published Wednesday in the journal Nature, offer a rare glimpse into the wild neural storm associated with mind-altering drugs. Researchers say they could provide a potential road map for understanding how psychedelic compounds like psilocybin, LSD and MDMA can lead to lasting relief from depression, anxiety and other mental health disorders.“Psilocybin, in contrast to any other drug we’ve tested, has this massive effect on the whole brain that was pretty unexpected,” said Dr. Nico Dosenbach, a professor of neurology at Washington University and a senior author of the study. “It was quite shocking when we saw the effect size.”We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

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      How Your Body and Mind Change in Midlife

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      Midlife, typically defined as ages 40 to 60, is an inflection point. It’s a time when our past behaviors begin to catch up with us and we start to notice our bodies and minds aging — sometimes in frustrating or disconcerting ways. But it’s also an opportunity: What our older years will look and feel […] More