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Category: Neuroscience

Neurons unexpectedly encode information in the timing of their firing

Neurons unexpectedly encode information in the timing of their firing

Elena Renken writes: For decades, neuroscientists have treated the brain somewhat like a Geiger counter: The rate at which neurons fire is taken as a measure of activity, just as a Geiger counter’s click rate indicates the strength of radiation. But new research suggests the brain may be more like a musical instrument. When you play the piano, how often you hit the keys matters, but the precise timing of the notes is also essential to the melody. “It’s really…

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An artificial network kept on the ‘edge of chaos’ acts much like a human brain

An artificial network kept on the ‘edge of chaos’ acts much like a human brain

Science Alert reports: Researchers have demonstrated how to keep a network of nanowires in a state that’s right on what’s known as the edge of chaos – an achievement that could be used to produce artificial intelligence (AI) that acts much like the human brain does. The team used varying levels of electricity on a nanowire simulation, finding a balance when the electric signal was too low when the signal was too high. If the signal was too low, the…

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Researchers identify brain circuit for spirituality

Researchers identify brain circuit for spirituality

Brigham and Women’s Hospital reports: More than 80 percent of people around the world consider themselves to be religious or spiritual. But research on the neuroscience of spirituality and religiosity has been sparse. Previous studies have used functional neuroimaging, in which an individual undergoes a brain scan while performing a task to see what areas of the brain light up. But these correlative studies have given a spotty and often inconsistent picture of spirituality. A new study led by investigators…

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‘Time cells’ identified in our brains encode the flow of time, scientists say

‘Time cells’ identified in our brains encode the flow of time, scientists say

Science Alert reports: How does the human brain keep track of the order of events in a sequence? New research suggests that ‘time cells’ – neurons in the hippocampus thought to represent temporal information – could be the glue that sticks our memories together in the right sequence so that we can properly recall the correct order in which things happened. Evidence for these kinds of sequence-tracking time cells was previously found in rats, where specific neuron assemblies are thought…

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Same or different? The question flummoxes neural networks

Same or different? The question flummoxes neural networks

John Pavlus writes: The first episode of Sesame Street in 1969 included a segment called “One of These Things Is Not Like the Other.” Viewers were asked to consider a poster that displayed three 2s and one W, and to decide — while singing along to the game’s eponymous jingle — which symbol didn’t belong. Dozens of episodes of Sesame Street repeated the game, comparing everything from abstract patterns to plates of vegetables. Kids never had to relearn the rules….

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Could mitochondria be the key to a healthy brain?

Could mitochondria be the key to a healthy brain?

Diana Kwon writes: Long before the earliest animals swam through the water-covered surface of Earth’s ancient past, one of the most important encounters in the history of life took place. A primitive bacterium was engulfed by our oldest ancestor — a solo, free-floating cell. The two fused to form a mutually beneficial relationship that has lasted more than a billion years, with the latter providing a safe, comfortable home and the former becoming a powerhouse, fueling the processes necessary to…

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Neuroscientists are ‘deeply confused’ about representational drift

Neuroscientists are ‘deeply confused’ about representational drift

Ed Yong writes: Carl Schoonover and Andrew Fink are confused. As neuroscientists, they know that the brain must be flexible but not too flexible. It must rewire itself in the face of new experiences, but must also consistently represent the features of the external world. How? The relatively simple explanation found in neuroscience textbooks is that specific groups of neurons reliably fire when their owner smells a rose, sees a sunset, or hears a bell. These representations—these patterns of neural…

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Social media and the neuroscience of predictive processing

Social media and the neuroscience of predictive processing

Mark Miller and Ben White write: Levi Jed Murphy smoulders into the camera. It’s a powerful look: piercing blue eyes, high cheekbones, full lips and a razor-sharp jawline – all of which, he says, cost him around £30,000. Murphy is an influencer from Manchester in the UK, with a large social media following. Speaking on his approach to growing his fans, he says that, if a picture doesn’t receive a certain number of ‘Likes’ within a set time, it gets…

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The English professor who foresaw modern neuroscience

The English professor who foresaw modern neuroscience

Christopher Comer and Ashley Taggart write: In the 21st century, neuroscience has been able to extend our understanding of the brain beyond brain anatomy to an increasingly functional view of cognition. Every year brings new insights on memory and imagination, and reveals often surprising areas of convergence with fields such as anthropology and philosophy. Yet it was a Cambridge professor of literature, almost a century ago in the aftermath of World War I, who pioneered a view of cognition we…

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Sleep evolved before brains. Hydras are living proof

Sleep evolved before brains. Hydras are living proof

Veronique Greenwood writes: The hydra is a simple creature. Less than half an inch long, its tubular body has a foot at one end and a mouth at the other. The foot clings to a surface underwater — a plant or a rock, perhaps — and the mouth, ringed with tentacles, ensnares passing water fleas. It does not have a brain, or even much of a nervous system. And yet, new research shows, it sleeps. Studies by a team in…

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What might brainlets in a dish tell us about what it means to be human?

What might brainlets in a dish tell us about what it means to be human?

Alysson Muotri writes: When I moved from Brazil to the United States to train as a neuroscientist, I was shocked to discover that most of our ‘knowledge’ about the human brain in fact came from another species: the mouse. This struck me as pretty strange. After all, it wasn’t the mouse brain that put us on the Moon or that decoded the human genome. It was the human brain in all its complexity that generated our understanding of life and…

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Do we have free will? Maybe it doesn’t matter

Do we have free will? Maybe it doesn’t matter

Jim Davies writes: Belief is a special kind of human power. Agustin Fuentes, an anthropologist at the University of Notre Dame, eloquently claims as much in his recent book Why We Believe: Evolution and the Human Way of Being. It’s the “most prominent, promising, and dangerous capacity humanity has evolved,” he writes, the power to “see and feel and know something—an idea, a vision, a necessity, a possibility, a truth—that is not immediately present to the senses, and then to…

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The brain ‘rotates’ memories to shield them from new sensations

The brain ‘rotates’ memories to shield them from new sensations

Jordana Cepelewicz writes: During every waking moment, we humans and other animals have to balance on the edge of our awareness of past and present. We must absorb new sensory information about the world around us while holding on to short-term memories of earlier observations or events. Our ability to make sense of our surroundings, to learn, to act and to think all depend on constant, nimble interactions between perception and memory. But to accomplish this, the brain has to…

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That is not how your brain works

That is not how your brain works

Lisa Feldman Barrett writes: As a neuroscientist, I see scientific myths about the brain repeated regularly in the media and corners of academic research. Three of them, in particular, stand out for correction. After all, each of us has a brain, so it’s critical to understand how that three-pound blob between your ears works. Myth number one is that specific parts of the human brain have specific psychological jobs. According to this myth, the brain is like a collection of…

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Martin Luther rewired your brain

Martin Luther rewired your brain

Joseph Henrich writes: Your brain has been altered, neurologically re-wired as you acquired a particular skill. This renovation has left you with a specialized area in your left ventral occipital temporal region, shifted facial recognition into your right hemisphere, reduced your inclination toward holistic visual processing, increased your verbal memory, and thickened your corpus callosum, which is the information highway that connects the left and right hemispheres of your brain. What accounts for these neurological and psychological changes? You are…

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How the brain responds to beauty

How the brain responds to beauty

Jason Castro writes: Pursued by poets and artists alike, beauty is ever elusive. We seek it in nature, art and philosophy but also in our phones and furniture. We value it beyond reason, look to surround ourselves with it and will even lose ourselves in pursuit of it. Our world is defined by it, and yet we struggle to ever define it. As philosopher George Santayana observed in his 1896 book The Sense of Beauty, there is within us “a…

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