Latest news with #PLOSOne
Yahoo
9 hours ago
- Science
- Yahoo
Startling Percentage of Neuroscientists Say We Could Extract Memories From Dead Brains
When you die, your memories die with you, never to be experienced again. Or at least, that's always been how the case. Now, though, in an exercise to assess shifting scientific consensus, a cohort of 312 neuroscientists were quizzed by researchers on whether memories might live on in the structure of deceased brains. And a surprisingly larger number — 70.7 percent of the group — believe they may, findings which were newly published in the science journal PLOS One. In addition, about 40 percent of those surveyed said they think it will be possible in the future to extract these memories from actual preserved parts or the entire brain of the deceased. The neuroscientists also gave a tentative roadmap for how that could unfold. They estimated that scientists would be able to resurrect memories from dead roundworms by 2045, and then from lab mice brains by 2065. For humans, scientists might achieve this incredible feat by 2125, the neuroscientists estimated. "That's a substantial chunk of neuroscientists who think there's a very real chance that it will work, and my guess is that actually that number will creep up over time as we get better at doing these brain implants, emulations, all these other things," Ariel Zeleznikow-Johnston, a research fellow at Monash University in Australia and the paper's first author, told IFL Science, which flagged the research. One major roadblock: there isn't yet a consensus on exactly how memories are stored. Zeleznikow-Johnston told IFL Science he thinks preserving the brain's connectome, which are neural pathways, would probably be the key to preserving, extracting and recalling memories from the dead. Before all this stuff happens, lots of major work needs to happen. But advanced tools such as AI could give scientists a significant boost in efforts to decode the human brain and possibly even decode memories from the deceased. If it does come to pass, we can barely imagine the ethical questions that would arise from such a feat. More on neuroscience: Scientists Scanned the Brains of Authoritarians and Found Something Weird
Gizmodo
12 hours ago
- Science
- Gizmodo
This Survey Asked Neuroscientists If Memories Can Be Extracted From the Dead. Here's What They Said
The allure and terror of transferring your consciousness to a computer has long been fodder for cyberpunk novels and billionaire-backed immortality startups. But a substantial chunk of neuroscientists think it might be possible to extract memories from a preserved brain and store those memories inside a computer, according to a new study. The study, published in the journal PLOS One, suggests that most neuroscientists believe that memory has a physical basis and, on average, give a 40% probability that we might one day be able to emulate a human brain. But there was little consensus as to what exactly that physical basis is, highlighting just how little we know about what memories are made of. The authors surveyed 312 neuroscientists—both memory experts and general neuroscientists—to get their thoughts on the feasibility of preserving a human brain and later extracting its memories. It was led by Ariel Zeleznikow-Johnston, a neuroscientist at Monash University in Australia and the author of The Future Loves You: How and Why We Should Abolish Death. While the researchers wrote that the questions of memory extraction from preserved brains are 'strange and speculative,' they provide insight into how neuroscientists think about memory formation. Results of the survey show that neuroscientists largely agree that memories have a physical substrate rather than relying on a dynamic process that ceases at preservation; they're likely stored in the synaptic connections between neurons, which strengthen and weaken with experience. The survey showed that 70% of neuroscientists agree that a physical, molecular record of a memory exists—stored in stable changes to neural connectivity and interactions between proteins and other cellular components—of which you could theoretically take a snapshot. However, 'there was no clear consensus on exactly which neurophysiological feature or scale is critical for memory storage,' the authors wrote in the study. The surveyed scientists didn't agree on what resolution—from the atomic-level composition of biomolecules to nanometer-level resolution of subcellular structures—would be required to extract a memory from a preserved brain. This is largely due to the fact that, while most neuroscientists agree that memory has a physical basis, it's still up for debate exactly what that basis is. The survey also asked whether existing tools could theoretically preserve the structure of a brain well enough to extract memories. Preserving a brain in such a way that the proteins and cells remain intact is tricky, since freezing can damage neural tissue. But one way neuroscientists could do this is through aldehyde-stabilized cryopreservation, a technique that combines chemical fixation with vitrification—the process of turning a substance into a glass-like solid by cooling it down rapidly. The study asked neuroscientists to assign a probability that memories could be extracted from a cryopreserved brain. The participants gave a wide range of estimates, but the median answer was around a 40% probability. The authors asked the neuroscientists how probable it might be to emulate a whole brain—like, uploading and digitizing a person's brain onto a computer—from preserved neural tissue. That could open up the possibility of uploading your full self and consciousness into a machine. In this case, the median answer was again around 40%, though the authors note that the responses again varied widely. 'Admittedly, that's not 100 percent,' Zeleznikow-Johnston told IFLScience. 'That means that there's not full consensus in the community that yeah, definitely this will work, but it's not 0.1 percent, or 0.01 percent. That's a substantial chunk of neuroscientists who think there's a very real chance that it will work, and my guess is that actually that number will creep up over time as we get better at doing these brain implants, emulations, all these other things.' Neuroscientists believe we're still a long way off from being able to emulate an entire human brain, according to the study. When asked when we might be able to emulate a human brain, the respondents gave a median answer of 2125. Still, it's something to think about.
Yahoo
4 days ago
- Science
- Yahoo
Humans hurled massive mammoth tusk boomerangs 40,000 years ago
Boomerangs are some of humanity's oldest tools. In the northernmost region of Australia, 50,000-year-old cave art appears to depict Indigenous hunters throwing the weapons at prey, including kangaroos. While most associated with Australia, boomerangs are also documented around the world. One famous example was discovered in an ancient cave in southern Poland in 1985. Instead of using wood, these Early Upper Paleolithic ancestors crafted their tool from a mammoth tusk. And according to recent radiocarbon reevaluations and Bayseian probability modeling, researchers now believe the ivory weapon is even older than previously estimated. Their findings are detailed in a study published in the journal PLOS One. The conclusion comes after an international research team reviewed artifacts recovered from Obłazowa Cave, one of Poland's most important Paleolithic sites. Originally identified in 1985, Obłazowa Cave contains evidence of both Neanderthal and human activity spanning at least ten eras. Some of the most important finds relate to Homo sapiens who occupied the cave roughly 30,000 years ago. These included animal bone pendants, a potential whistle made from a snail shell, and human remains. Archaeologists at the time also unearthed a mammoth tusk boomerang estimated to date back to the same era. For nearly three decades, that specimen offered the tool's oldest known example in Europe. But after careful reexamination using more accurate radiocarbon dating methods, the boomerang's origin is likely closer to 40,000 years ago. As Interesting Engineering explains, the revised age can help researchers better contextualize an important time during the Upper Paleolithic known as the Early Aurignacian, when humans began migrating across Europe in large numbers. Even that long ago, archaeological evidence clearly shows Homo sapiens already engaging in creative, complex, and symbolic projects. These included the manufacturing of refined tools, decorative adornments and jewelry, as well as participating in elaborate ritualistic burials. At about 2.36 feet wide, the ivory boomerang wasn't designed to arc through the air and return to its user. Instead, hunters almost certainly intended the hefty weapon to accurately smack into their prey and kill it—or at least stun a creature long enough for them to close in on the target. 'From an economic perspective, creating and transporting a sizable object like the boomerang represents a unique commitment,' they wrote. 'The intentional thinning of the mammoth tusk to achieve symmetry reflects a notable investment in a context where mobility was essential. Since no ivory fragments were found at the site, the boomerang must have been crafted elsewhere and carried to Obłazowa Cave, underscoring its special status.' According to archaeologists, their latest research not only furthers their understanding of early human adaptive strategies, but highlights 'the nuanced interplay of technology, symbolism, and environmental interaction during the earliest phases of human dispersals in Central Europe.'While experts have previously confirmed the use of boomerangs at various locations including Australia, Central Europe, North Africa, and ancient Egypt, the tools were by no means ubiquitous across all cultures. This means that evidence of the weapons—let alone those carved from mammoth tusks—can serve as vital sources of information on human societal evolution.
MTV Lebanon
5 days ago
- Science
- MTV Lebanon
World's Oldest Boomerang Doesn't Actually Come Back
The world's oldest boomerang is older than previously thought, casting new light on the ingenuity of humans living at the time. The tool, which was found in a cave in Poland in 1985, is now thought to be 40,000 years old. Archaeologists say it was fashioned from a mammoth's tusk with an astonishing level of skill. Researchers worked out from its shape that it would have flown when thrown, but would not have come back to the thrower. It was probably used in hunting, though it might have had cultural or artistic value, perhaps being used in some kind of ritual. The mammoth ivory boomerang was unearthed in Oblazowa Cave in southern Poland. It was originally thought to be about 30,000 years old. But new, more reliable radiocarbon dating of human and animal bones found at the site puts the age at between 39,000 and 42,000 years old. "It's the oldest boomerang in the world, and the only one in the world made of this shape and this long to be found in Poland," said Dr Sahra Talamo of the University of Bologna, Italy. It gives a "remarkable insight" into human behaviour, she said, particularly how Homo sapiens living as long as 42,000 years ago could shape "such a perfect object" with the knowledge it could be used to hunt animals. The boomerang is exceptionally well preserved, with score marks suggesting it had been polished and carved for use by a right-handed individual. Boomerangs are generally associated with Aboriginal culture in Australia. However, rare finds in the historical record outside Australia suggest they were used across different continents. The oldest known boomerang from Australia dates to about 10,500 years ago, made from wood. But the oldest images of boomerangs in Australia are rock art paintings 20,000 years old, according to National Museum Australia. A wooden boomerang dating back 7,000 years has been found in Jutland, a peninsula between Denmark and Germany, while fragments of a 2,000-year-old oak boomerang – which does come back – has been found in The Netherlands. The research by a team of scientists from Poland, Italy, Germany, France, Switzerland and the UK is published in the journal PLOS One.
BBC News
5 days ago
- Science
- BBC News
World's oldest boomerang doesn't actually come back
Boomerangs are generally associated with Aboriginal culture in Australia. However, rare finds in the historical record outside Australia suggest they were used across different continents. The oldest known boomerang from Australia dates to about 10,500 years ago, made from wood. But the oldest images of boomerangs in Australia are rock art paintings 20,000 years old, according to National Museum Australia. A wooden boomerang dating back 7,000 years has been found in Jutland, a peninsula between Denmark and Germany, while fragments of a 2,000-year-old oak boomerang – which does come back – has been found in The Netherlands. The research by a team of scientists from Poland, Italy, Germany, France, Switzerland and the UK is published in the journal PLOS One.
