The appearance of a “tropical” mosquito-borne illness in southeastern Australia has unsettled researchers
In mice, pregnancy results in new neurons that support recognition of pups
Geoffrey Hinton has spent a lifetime teaching computers to learn. Now he worries that artificial brains are better than ours.
In your brain, neurons are arranged in networks big and small. With every action, with every thought, the networks change: neurons are included or excluded, and the connections between them strengthen or fade. This process goes on all the time—it’s happening now, as you read these words—and its scale is beyond imagining. You have some eighty billion neurons sharing a hundred trillion connections or more. Your skull contains a galaxy’s worth of constellations, always shifting.
Too often, a facial-recognition search represents virtually the entirety of a police investigation.
By Eyal Press
On March 26, 2022, at around 8:20 a.m., a man in light-blue Nike sweatpants boarded a bus near a shopping plaza in Timonium, outside Baltimore. After the bus driver ordered him to observe a rule requiring passengers to wear face masks, he approached the fare box and began arguing with her. “I hit bitches,” he said, leaning over a plastic shield that the driver was sitting behind. When she pulled out her iPhone to call the police, he reached around the shield, snatched the device, and raced off. The bus driver followed the man outside, where he punched her in the face repeatedly. He then stood by the curb, laughing, as his victim wiped blood from her nose.
Coding has always felt to me like an endlessly deep and rich domain. Now I find myself wanting to write a eulogy for it.
By James Somers
Big outbreak at a Spanish farm reignites fears of an H5N1 influenza pandemic
Plans to drown orchards and farm fields to boost groundwater supplies get off to a slow start
Highlights from the Science family of journals
Science Magazine – Brain connectivityThe brain is so much more than its constituent cells. Each neuron in the brain connects with thousands of other neurons—but instead of a cacophony of connections, we have a synchronized symphony.
Detailed knowledge about the neural connections among regions of the brain is key for advancing our understanding of normal brain function and changes that occur with aging and disease.
Can we construct a model of brain function that enables an understanding of whole-brain circuit mechanisms underlying neurological disease and use it to predict the outcome of therapeutic interventions?
For many older adults, a good night’s rest is elusive. The implications of chronically poor sleep can be far-reaching and include a decline in cognitive functioning and detrimental effects on health and general well-being. Fortunately, relief may be in sight.
A new study led by investigators at the Stanford University School of Medicine shows that neurons in the lateral hypothalamus, a brain region, play a pivotal role in sleep loss in old mice. More specifically, the arousal-promoting hypocretin neurons become hyperexcitable, driving sleep interruptions.
Read the full story: https://stan.md/3JQ7z77
Luis de Lecea, PhD, is a professor of psychiatry and behavioral sciences at Stanford Medicine. He is the study’s senior author and hopes the finding could pave the way to new drug treatments for age-related sleep problems in humans.
Shi-Bin Li, PhD, is an instructor in the Psychiatry and Behavioral Sciences department at Stanford Medicine. He is also a basic life research scientist in the de Lecea lab, and is the lead author of the study.
The neurons behind acupuncture’s effect on inflammation, and how antibiotics affect gut bacteria.
In this episode:
00:54 The neuronal basis for acupuncture’s effect on inflammation
In mice, electroacupuncture has been shown to reduce inflammation, but only when certain points on the body are stimulated. Why this is has puzzled scientists, but now, researchers have identified the specific neurons that are involved. They hope that this knowledge could be used in future to help treat certain inflammatory-related diseases.
Research article: Liu et al.
News and Views: Electroacupuncture activates neurons to switch off inflammation
07:28 Research Highlights
The Aztec origins of an obsidian ‘spirit mirror’, and the damage done by a Soviet plutonium complex.
Research Highlight: A ‘spirit mirror’ used in Elizabeth I’s court had Aztec roots
Research Highlight: Cold-war spy pictures reveal a Soviet nuclear ‘cloud generator’
10:18 Assessing antibiotics’ collateral damage.
Antibiotics are known to cause damage to the communities of bacteria that live in our guts. To better understand why this happens, a team has mapped the effects that different antibiotics have on individual gut-bacteria species, which may offer new insights into preventing this collateral damage.
Research article: Maier et al.
17:32 Briefing Chat
We discuss some highlights from the Nature Briefing. This time, the latest species to be declared extinct in the US, and a potential planet that orbits three stars.
New York Times: Protected Too Late: U.S. Officials Report More Than 20 Extinctions
New York Times: This May Be the First Planet Found Orbiting 3 Stars at Once
Your brain is keenly aware of what’s going on inside your body at all times. Some things are obvious – like when you feel hungry or thirsty. But some things you never notice – like how blood vessels all over your body simultaneously contract as you stand up, so you don’t lose blood flow to your brain. But how does your brain know when to send the signal to squeeze? It’s all part of concept scientists call interoception – the dialogue between your brain and the rest of your body.
Interoception is involved in everything from keeping us balanced while we walk, to keeping our blood pressure and heart rate steady. It even appears to influence our moods and emotions. And thanks to recent discoveries, we’re learning more about how interoception works. Researchers identified two special channels in neurons that react to touch and named them PIEZO1 and PIEZO2. Since first identifying these pressure sensors, researchers have found PIEZOs in internal organs like the heart, lungs, and blood vessels lining the stomach… suggesting many physiological functions involve mechanical forces that our brain and other parts of our nervous system must monitor and influence. As the study of interoception grows, scientists are hopeful the field could lead to breakthroughs in treating heart disease, controlling blood pressure, relieving anxiety and depression, and treating a number of other disorders. Learn more about Scripps Research at scripps.edu.
Addressing the problem of sudden food scarcity in US cities, and the up-and-coming field of computational social science.
In this episode:
00:45 Food shocks
Climate change, the COVID-19 pandemic, and geopolitical crises can cause food shortages. To tackle this issue, Alfonso Mejia and colleagues have modelled how to best mitigate these food shocks in US cities. Alfonso tells us about the new analyses and what steps cities could take in the future.
Research Article: Gomez et al.
News and Views: How to buffer against an urban food shortage
06:07 Research Highlights
A tiny lattice can withstand the impacts of projectiles at twice the speed of sound, and the neurons that allow humans to perceive time.
Research Highlight: Supersonic strikes leave just a dent in this super-light material
Research Highlight: The ‘time neurons’ that help the brain keep track
08:25 Computational Social Science
Big data is transforming research, and social science is no exception. This week, Nature is running a special issue on ‘computational social science’. We catch up with some of the editors involved to find out more about this up-and-coming field.
Collections: Computational Social Science
19:27 Briefing Chat
We discuss some highlights from the Nature Briefing. This time, discovering the dazzling diversity of viruses, and how China eradicated malaria.
Nature News Feature: Beyond coronavirus: the virus discoveries transforming biology
Researchers have also documented clear links between aerobic exercise and benefits to other parts of the brain, including expansion of the prefrontal cortex, which sits just behind the forehead. Such augmentation of this region has been tied to sharper executive cognitive functions, which involve aspects of planning, decision-making and multitasking—abilities that, like memory, tend to decline with healthy aging and are further degraded in the presence of Alzheimer’s. Scientists suspect that increased connections between existing neurons, rather than the birth of new neurons, are responsible for the beneficial effects of exercise on the prefrontal cortex and other brain regions outside the hippocampus.
Boomers Daily 