from the world's big
A new AI passes the smell test almost 100% of the time
Our remarkable olfactory senses are modeled in a new research chip.
- Two researchers have created an algorithm that can accurately identify 10 different smells.
- The AI algorithm runs on an Intel chip that has 130,000 silicon "neurons."
- The natural mammalian olfactory bulb grows new neurons even in adults.
Our noses are busy beasts. At any given moment, multiple smells are competing for our attention, and somehow the brain can tell when it's smelling an orange even against a backdrop of other scents, say perfume or soap. The brain's olfactory bulb has hundreds of receptors tracking odors all the time, and yet somehow keeps everything straight. A scientist at Cornell University working with a researcher at Intel has just created an AI algorithm trained to recognize 10 scents by mimicking the mammalian olfactory bulb (MOB). Give the algorithm a computer chip to run on and it can learn to identify new odors.
Simulating the brain
Image source: GiroScience/Shutterstock
Thomas Cleland, senior author of "Rapid Learning and Robust Recall in a Neuromorphic Olfactory Circuit" published in Nature Machine Intelligence says, "This is a result of over a decade of studying olfactory bulb circuitry in rodents and trying to figure out essentially how it works, with an eye towards things we know animals can do that our machines can't."
"We now know enough to make this work," says Cleland speaking with Cornell Chronicle. "We've built this computational model based on this circuitry, guided heavily by things we know about the biological systems' connectivity and dynamics. Then we say, if this were so, this would work. And the interesting part is that it does work."
Cleland's co-author, Intel intern Nabil Imam, has the AI running on an Intel research chip called Loihi. The chip is something of a wonder all by itself. It's designed to perform neuromorphic computing inspired by the brain, sporting some 130,000 silicon "neurons." Like our own neurons, each can fire independently of the others, sending pulsed signals to its neighbors, changing their electrical states. In addition, Loihi can accept inputs from a variety of physical sensors, such as the metal-oxide chemical sensors that Cleland and Imam used, allowing the entire structure to simulate the natural learning process that occurs when the mammalian brain is fed various sensory inputs.
What the AI knows
In the MOB, there are a couple of important neuron types: mitral cells that switch on to signify a smell has been detected but don't identify it, and granule cells that learn to become specialized and pinpoint chemicals in the smell. This is the process Cleland and Imam have programmed Loihi to imitate when odors are presented to the system's sensors.
The researchers have trained the algorithm to identify 10 chemical smells: acetone, acetaldehyde, ammonia, butanol, ethylene, methane, methanol, carbon monoxide, benzene, and toluene. The idea is that in the presence of an odor, Loihi verifies the scent's presence and patterns of firing neurons identify exactly which smell it is.
Over the course of five cycles of exposure to each odor, the AI was eventually able to associate specific neural firing patterns with specific smells. The AI correctly identified eight of the smells 100 percent of the time, and the remaining two with 90 percent accuracy.
Additional simulations were run in which the target odor was masked 80 percent by other smells, the way they'd often be in the real word. In these tests, accuracy dropped down to just 30 percent, though that's still pretty impressive for such a "young" AI. Says Cleland, "The pattern of the signal has been substantially destroyed, and yet the system is able to recover it."
The sweet smell of success
Image source: Patrick J. Lynch, wikimedia
As AI and machine learning do, Cleland's and Imam's algorithm would be expected to get better with more training. Machine smell-detection for use in bomb-sniffing, for example, is clearly not just around the corner. Still, the research offers new insights about learning.
Due to the normally finite number of neurons available for storage of new memories in an adult brain, and the fact that "when you learn something, it permanently differentiates neurons," as Cleland says, storing new information means changing the information already encoded in neurons. However, the mammalian olfactory bulb is able to continually learn smells — hundreds or thousands of them —without losing knowledge of already-learned odors. It's one of the few areas of the brain that can keep creating new neurons through adulthood.
The researchers' experience with Loihi underscores the value of the olfactory bulb's unusual neuronal expandability. "The computational model turns into a biological hypothesis for why adult neurogenesis is important," Cleland says, "because it does this thing that otherwise would make the system not work. So in that sense, the model is feeding back into biology. And in this other sense, it's the basis for a set of devices for artificial olfactory systems that can be constructed commercially."
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- How the brain processes our sense of smell - Big Think ›
Emotional intelligence is a skill sought by many employers. Here's how to raise yours.
- Daniel Goleman's 1995 book Emotional Intelligence catapulted the term into widespread use in the business world.
- One study found that EQ (emotional intelligence) is the top predictor of performance and accounts for 58% of success across all job types.
- EQ has been found to increase annual pay by around $29,000 and be present in 90% of top performers.
The achievement is an important milestone in quantum computing, Google's scientists said.
- Sycamore is a quantum computer that Google has spent years developing.
- Like traditional computers, quantum computers produce binary code, but they do so while utilizing unique phenomena of quantum mechanics.
- It will likely be years before quantum computing has applications in everyday technology, but the recent achievement is an important proof of concept.
How quantum computers differ from traditional computers<p>Like traditional computers, quantum computers produce binary code to execute computing functions. But instead of using transistors to represent the ones and zeroes, as traditional computers do, quantum computers like Sycamore use quantum bits, or "qubits."</p><p>Qubits are extremely tiny pieces of hardware that act like subatomic particles, utilizing quantum phenomena like entanglement, superposition, and interference. Qubits can represent ones and zeroes. But thanks to superposition, qubits are also able to represent multiple states at the same time, meaning they can make calculations much faster than traditional computers. That's what helped Sycamore recently outperform a supercomputer.</p><p>Sycamore achieved "quantum supremacy," which occurs when a quantum computer can do something that a traditional computer cannot. To pass this benchmark, Google engineers pit Sycamore against the world's leading supercomputer, Summit, which is housed at Oak Ridge National Laboratory in Tennessee.</p><p>"Summit is currently the world's leading supercomputer, capable of carrying out about 200 million billion operations per second," William Oliver, a physicist at the Massachusetts Institute of Technology, wrote in a <a href="https://www.nature.com/articles/d41586-019-03173-4" target="_blank">"News and Views" piece</a> for <em>Nature</em>.</p><p>But the contest between Sycamore and Summit involved a highly specific task, one that was specifically designed to give a competitive edge to a quantum computer like Sycamore.</p>
Beating the world's leading supercomputer<p>The task involved estimating how likely it was that a processor would produce some "bitstrings" more often than others. As you continue to add information to the equation, it becomes exponentially difficult for traditional computers to conduct the calculations. (You can read more about the experiment <a href="https://ai.googleblog.com/2019/10/quantum-supremacy-using-programmable.html" target="_blank">here</a>.)</p><p>"We performed a fixed set of operations that entangles 53 qubits into a complex superposition state," Ben Chiaro, a graduate student researcher in the Martinis Group, which conducted the experiment, told <em><a href="https://www.sciencedaily.com/releases/2019/10/191023133358.htm" target="_blank">Science Daily</a></em>. "This superposition state encodes the probability distribution. For the quantum computer, preparing this superposition state is accomplished by applying a sequence of tens of control pulses to each qubit in a matter of microseconds. We can prepare and then sample from this distribution by measuring the qubits a million times in 200 seconds."</p><p>"For classical computers, it is much more difficult to compute the outcome of these operations because it requires computing the probability of being in any one of the 2^53 possible states, where the 53 comes from the number of qubits -- the exponential scaling is why people are interested in quantum computing to begin with," Brooks Foxen, another graduate student researcher in the Martinis Group, told <em>Science Daily</em>. "This is done by matrix multiplication, which is expensive for classical computers as the matrices become large."</p><p>But the specific nature of this task has led some to question the utility of quantum computers like Sycamore.</p><p>"One criticism we've heard a lot is that we cooked up this contrived benchmark problem—[Sycamore] doesn't do anything useful yet," Hartmut Neven, a Google engineering director said at a press event on Wednesday. "That's why we like to compare it to a Sputnik moment. Sputnik didn't do much either. All it did was circle Earth. Yet it was the start of the Space Age."</p>
A proof of concept for quantum computing<p>Although it could be decades until we see quantum computing powering everyday devices, Sycamore serves as a proof of concept that there exists a form of computing that has the potential to be vastly superior to traditional computing.</p><p>"This demonstration of quantum supremacy over today's leading classical algorithms on the world's fastest supercomputers is truly a remarkable achievement and a milestone for quantum computing," Oliver wrote in his piece for <em>Nature</em>. "It experimentally suggests that quantum computers represent a model of computing that is fundamentally different from that of classical computers. It also further combats criticisms about the controllability and viability of quantum computation in an extraordinarily large computational space (containing at least the 253 states used here)."</p>
A study published Friday tested how well 14 commonly available face masks blocked the emission of respiratory droplets as people were speaking.
- The study tested the efficacy of popular types of face masks, including N95 respirators, bandanas, cotton-polypropylene masks, gaiters, and others.
- The results showed that N95 respirators were most effective, while wearing a neck fleece (aka gaiter) actually produced more respiratory droplets than wearing no mask at all.
- Certain types of homemade masks seem to be effective at blocking the spread of COVID-19.
Fischer et al.<p>A smartphone camera recorded video of the participants, and a computer algorithm counted the number of droplets they emitted. To establish a control trial, the participants spoke into the box both with and without a mask. And to make sure that the droplets weren't in fact dust from the masks, the team conducted more tests by "repeatedly puffing air from a bulb through the masks."</p>
Fischer et al.<p>The results, published Friday in <a href="https://advances.sciencemag.org/content/early/2020/08/07/sciadv.abd3083" target="_blank">Science Advances</a>, showed that some masks are pretty much useless. In particular, neck fleeces (also called gaiters) actually produced more respiratory droplets compared to the control trial — likely because the fabric breaks down big droplets into smaller ones.</p><p>The top three most effective masks were N95 respirators, surgical masks, and polypropylene-cotton masks. Bandanas performed the worst, but were slightly better than wearing no mask at all.</p>
Fischer et al.<p>Research on mask efficacy is still emerging. But the new results seem to generally align with <a href="https://newsroom.wakehealth.edu/News-Releases/2020/04/Testing-Shows-Type-of-Cloth-Used-in-Homemade-Masks-Makes-a-Difference" target="_blank" rel="noopener noreferrer dofollow">prior tests</a>. For example, a study from June published in <a href="https://aip.scitation.org/doi/10.1063/5.0016018" target="_blank" rel="noopener noreferrer dofollow">Physics of Fluid</a> found that bandanas (followed by folded handkerchiefs) were least effective at blocking respiratory droplets. That same study also found, as <a href="https://newsroom.wakehealth.edu/News-Releases/2020/04/Testing-Shows-Type-of-Cloth-Used-in-Homemade-Masks-Makes-a-Difference" target="_blank" rel="noopener noreferrer dofollow">others have</a>, that masks made from multiple layers of quilter's fabric were especially effective at blocking droplets.</p><p>The researchers hope other institutions will conduct similar experiments so the public can see how well different masks can block the spread of COVID-19.</p><p style="margin-left: 20px;">"This is a very powerful visual tool to raise awareness that a very simple masks, like these homemade cotton masks, do really well to stop the majority of these respiratory droplets," Fischer told CNN. "Companies and manufacturers can set this up and test their mask designs before producing them, which would also be very useful."</p>
Sharing QAnon disinformation is harming the children devotees purport to help.
- The conspiracy theory, QAnon, is doing more harm than good in the battle to end child trafficking.
- Foster youth expert, Regan Williams, says there are 25-29k missing children every year, not 800k, as marketed by QAnon.
- Real ways to help abused children include donating to nonprofits, taking educational workshops, and becoming a foster parent.
Real ways you can help stop child trafficking<span style="display:block;position:relative;padding-top:56.25%;" class="rm-shortcode" data-rm-shortcode-id="21fc2dc85391501eec28c4bf46d7db15"><iframe type="lazy-iframe" data-runner-src="https://www.youtube.com/embed/AXL0q9jNZGU?rel=0" width="100%" height="auto" frameborder="0" scrolling="no" style="position:absolute;top:0;left:0;width:100%;height:100%;"></iframe></span><p>Williams is the founder and CEO of <a href="http://www.seenandheard.org/" target="_blank">Seen and Heard</a>, a Los Angeles-based nonprofit that helps foster youth develop character through the performing arts. She's been involved with foster youth for years; I <a href="https://bigthink.com/politics-current-affairs/child-sex-trafficking" target="_self">wrote about her work</a> in child trafficking just over a year ago. Tragically, since that time, the situation for these children has only gotten worse, in large part because of QAnon.</p><p>Williams says child trafficking is an easy cause to rally people together. Fear is also a powerful unifying force, one that QAnon believers are already primed for via the news they consume. Almost every parent cares about their children, making them the ideal target to solidify groups. </p><p>The real problem, she says, is that the youth she works with are falling for these conspiracy theories. Trauma is a particularly powerful tool for indoctrination. If you're a teenager that's been abducted or abused, your trust level is already extremely low. Then you read about a global cabal of powerful men (and a few women) secretly abusing children, and the narrative seems ready-made for your personal history.</p><p>When Williams tried to "lovingly and kindly correct" the youth she was working with after learning about the Wayfair conspiracy, the girls' response was, "well, who owns the media?" </p><p style="margin-left: 20px;">"She goes from this small little thing to a QAnon talking point. I've been thinking about why she would believe such a preposterous idea—and there are others; it's not just one student, and they're in in deep. I think that when something horrific happens to you as a child, it's a lot easier to distance yourself from the immediate reality that it was an uncle or a parent or a sibling that hurt you. By detaching from that immediate person, they project it onto Bill Gates or Chrissy Teigen. Then it's not so personal, it's global." </p>
A man wear a shirt with the words Q Anon as he attends a rally for President Donald Trump at the Make America Great Again Rally being held in the Florida State Fair Grounds Expo Hall on July 31, 2018 in Tampa, Florida.
Photo by Joe Raedle/Getty Images<p>As Williams mentions, there are over 30,000 kids in foster care in the Los Angeles area alone. It's easy to fall through the cracks. The systems in place aren't perfect; they're certainly underfunded. When you're in a system trying to support you yet isn't capable of doing so, viewing the world as imperfect, and even harmful, becomes the lens through which you see reality. Again, this makes for a perfect indoctrination tool.</p><p>One popular QAnon talking point is that 800,000 children are missing. As Williams says, child trafficking experts "don't buy this for a minute." The number makes for a good meme but a poor representation of the problem. </p><p>To source better data, Williams turns to the <a href="https://www.missingkids.org/" target="_blank">National Center for Missing and Exploited Children</a> (NCMEC) and the <a href="https://www.fbi.gov/services/cjis/ncic" target="_blank" rel="noopener noreferrer dofollow">National Crime Information Center</a> (NCIC). An important factor when reading data: if a teacher <em>and</em> a caregiver report a missing child to NCIC, that counts as two children, not one, which accounts for some of the fluctuations in numbers. In total, between 25,000 and 29,000 kids go missing every year. Importantly, 94 percent of those children are recovered within four to six weeks. </p><p style="margin-left: 20px;">"They're not documenting the recovery rate. It's not like these numbers are perpetually hanging out there. So this 800,000 number is just ludicrous." </p><p>Williams compares what's going on to Black Lives Matter. Blacking out your Instagram profile picture is performative. It signals that you actually care, which is great, but if you're not supporting Black-owned businesses, for example, there are no teeth to your activism. </p><p>Of course, blacking out your profile doesn't cause the real-world harm the QAnon virus does. Sharing misinformation is ultimately harmful to the children in need of help. Williams offers the resources below—ranging from donations to nonprofits to educational trainings to becoming a foster parent—for people that actually want to do something to help victims of sexual and physical abuse. They might not make a great Twitter meme, but in the actual world, this support makes all the difference. </p><p><strong>To report abuse/neglect, call the child abuse hotline: 800.540.4000 (LA county) / 800.422.4453 (National)</strong></p><ul><li>Support anti-trafficking organizations by donating to <a rel="noopener noreferrer dofollow" href="http://savinginnocence.org/" target="_blank">Saving Innocence</a>, which runs the continuum of care from rescue to recovery, <a href="http://gozoe.org/" target="_blank" rel="noopener noreferrer dofollow">Zoe</a>, a reputable faith-based organization, and <a rel="noopener noreferrer dofollow" href="https://withtwowings.org/" target="_blank">Two Wings</a>, which helps to rehabilitate female survivors</li><li><a rel="noopener noreferrer dofollow" href="http://www.nolabrantleyspeaks.org/" target="_blank">Nola Brantley</a> offers in-person and online trainings to help combat the commercial sexual exploitation of children</li><li><a rel="noopener noreferrer dofollow" href="http://instagram.com/imrebeccabender" target="_blank">Rebecca Bender</a> is a trafficking survivor that runs "Myth Busters," which combats conspiracy theory disinformation</li><li>The <a href="https://www.instagram.com/missingkids/" target="_blank" rel="noopener noreferrer dofollow">National Center</a> of Missing and Exploited Children</li><li>Operation <a href="https://www.instagram.com/ourrescue/" target="_blank" rel="noopener noreferrer dofollow">Underground Railroad </a></li><li><a href="https://www.instagram.com/defendinnocence/" target="_blank" rel="noopener noreferrer dofollow">Defend Innocence</a> offers tips for parents and caregivers to keep kids safe</li></ul><p><span></span>--</p><p><em>Stay in touch with Derek on <a href="http://www.twitter.com/derekberes" target="_blank">Twitter</a>, <a href="https://www.facebook.com/DerekBeresdotcom" target="_blank">Facebook</a> and <a href="https://derekberes.substack.com/" target="_blank">Substack</a>. His next book is</em> "<em>Hero's Dose: The Case For Psychedelics in Ritual and Therapy."</em></p>