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…
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…
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…
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…
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…
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…
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…
Joseph Fridman writes: The machine they built is hungry. As far back as 2016, Facebook’s engineers could brag that their creation ‘ingests trillions of data points every day’ and produces ‘more than 6 million predictions per second’. Undoubtedly Facebook’s prediction engines are even more potent now, making relentless conjectures about your brand loyalties, your cravings, the arc of your desires. The company’s core market is what the social psychologist Shoshana Zuboff describes as ‘prediction products’: guesses about the future, assembled…
Lydia Wilson writes: The Chinese artist Xu Bing has long experimented to stunning effect with the limits of the written form. Last year I visited the Centre del Carme in Valencia, Spain, to see a retrospective of his work. One installation, Book from the Sky, featured scrolls of paper looping down from the ceiling and lying along the floor of a large room, printed Chinese characters emerging into view as I moved closer to the reams of paper. But this…
Frédérique de Vignemont and Colin Klein write: Heini Hediger, a noted 20th-century Swiss biologist and zoo director, knew that animals ran away when they felt unsafe. But when he set about designing and building zoos himself, he realised he needed a more precise understanding of how animals behaved when put in proximity to one another. Hediger decided to investigate the flight response systematically, something that no one had done before. Hediger found that the space around an animal could be…
Deborah Devis writes: The gut is well known for being the first line of defence against infection, but it seems it also protects our most important organ – the brain. According to surprising new research, antibodies that defend the perimeter of the brain are normally found in, and trained by, our gut. “This finding opens a new area of neuroimmunology, showing that gut-educated antibody-producing cells inhabit and defend regions that surround the central nervous system,” says Dorian McGavern from the…
NPR reports: If you fall off a bike, you’ll probably end up with a cinematic memory of the experience: the wind in your hair, the pebble on the road, then the pain. That’s known as an episodic memory. And now researchers have identified cells in the human brain that make this sort of memory possible, a team reports in the journal Proceedings of the National Academy of Sciences. The cells are called time cells, and they place a sort of…
Tam Hunt writes: Christof Koch is a neuroscientist distinguished by his rock-solid scientific work and romantic yearning to understand consciousness. He recently closed an essay by wondering: “What is it about the brain, the most complex piece of active matter in the known universe, that turns its activity into the feeling of life itself?” No coincidence with that phrasing—The Feeling of Life Itself is his latest book. He argues that consciousness is produced by the brain but that it’s also…
Steve Paulson writes: Brain “plasticity” is one of the great discoveries in modern science, but neuroscientist David Eagleman thinks the word is misleading. Unlike plastic, which molds and then retains a particular shape, the brain’s physical structure is continually in flux. But Eagleman can’t avoid the word. “The whole literature uses that term plasticity, so I use it sparingly,” he says. Eagleman also discounts computer analogies to the brain. He’s coined the term “livewired” (the title of his new book)…
Daniel Yon writes: The Book of Days (1864) by the Scottish author Robert Chambers reports a curious legal case: in 1457 in the town of Lavegny, a sow and her piglets were charged and tried for the murder of a partially eaten small child. After much deliberation, the court condemned the sow to death for her part in the act, but acquitted the naive piglets who were too young to appreciate the gravity of their crimes. Subjecting a pig to…
Sharon Begley writes: Whether crows, ravens, and other “corvids” are making multipart tools like hooked sticks to reach grubs, solving geometry puzzles made famous by Aesop, or nudging a clueless hedgehog across a highway before it becomes roadkill, they have long impressed scientists with their intelligence and creativity. Now the birds can add one more feather to their brainiac claims: Research unveiled on Thursday in Science finds that crows know what they know and can ponder the content of their…