Thought Shrapnel

Well this is cool. Although there are limited ways of refocusing a shot after taking it, this new method allows that to be taken to the next level using existing technologies. It could be useful for everything from smartphones to telescopes.

Essentially, scientists have developed a new imaging technique that captures two images simultaneously, one with a low depth of field and another with a high depth of field. Algorithms then combine these images to create a hybrid picture with adjustable depth of field while maintaining sharpness.

Smartphones and movie cameras might one day do what regular cameras now cannot—change the sharpness of any given object once it has been captured, without sacrificing picture quality. Scientists developed the trick from an exotic form of holography and from techniques developed for X-ray cameras used in outer space.

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A critical aspect of any camera is its depth of field, the distance over which it can produce sharp images. Although modern cameras can adjust their depth of field before capturing a photo, they cannot tune the depth of field afterwards.

True, there are computational methods that can, to some extent, refocus slightly blurred features digitally. But it comes at a cost: “Previously sharp features become blurred,” says study senior author Vijayakumar Anand, an optical engineer at the University of Tartu in Estonia.

The new method requires no newly developed hardware, only conventional optics, “and therefore can be easily implemented in existing imaging technologies,” Anand says.

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The new study combines recent advances in incoherent holography with a lensless approach to photography known as coded-aperture imaging.

An aperture can function as a lens. Indeed, the first camera was essentially a lightproof box with a pinhole-size hole in one side. The size of the resulting image depends on the distance between the scene and the pinhole. Coded-aperture imaging replaces the single opening of the pinhole camera with many openings, which results in many overlapping images. A computer can process them all to reconstruct a picture of a scene.

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The new technique records two images simultaneously, one with a refractive lens, the other with a conical prism known as a refractive axicon. The lens has a low depth of field, whereas the axicon has a high depth of field.

Algorithms combine the images to create a hybrid picture for which the depth of field can be adjusted between that of the lens and that of the axicon. The algorithms preserve the highest image sharpness during such tuning.

This article by Andrew Dessler discusses the near-miss catastrophe of ozone depletion. Anyone alive at the time can probably remember how the world came together to address the issue by phasing out chlorofluorocarbons (CFCs) through the Montreal Protocol in 1987.

Dessler draws parallels with the current climate crisis, arguing that global policy collaboration based on scientific research can solve pressing environmental issues. Along the way, he also debunks claims that transitioning to renewable energy would be economically catastrophic.

In the early 1970s, scientists theorized that certain man-made chemicals, known as chlorofluorocarbons or CFCs, had the potential to reduce the amount of ozone in our atmosphere — this became known as ozone depletion. Given the crucial role of ozone in maintaining a livable environment, this caused great concern.

Even before evidence of actual ozone depletion was observed, countries began to take action. For example, the U.S. banned many non-essential uses of the chemicals, such as propellants in aerosol spray cans. This reflected a different view at the time that government should protect its citizens rather than protect the profits of corporations.

By the mid-1980s, the world was busy negotiating the phase-out of the primary ozone-depleting CFCs when the Antarctic ozone hole (AOH) was discovered. The AOH is an annual event: over Antarctica, the majority of the ozone is destroyed during Spring. The ozone builds back up as Spring ends and, by Summer, things are basically back to normal.

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The ‘reference’ future is our world, the ‘world avoided’ is the world that would have existed had we not phased out CFCs. By the 2060s, the world would have lost two-thirds of it’s ozone. This, in turn, would have greatly increased the dangerous ultraviolet radiation reaching the surface. This plot shows the UV dose at noon under clear skies in July in mid-latitudes.

Today’s value of 10 is ‘high risk’ for UV exposure, which is why public health professionals tell you to wear sunscreen when you go out. The world avoided has a UV index of 30 — three times what is considered high risk and high enough to give you a perceptible sunburn in 5 minutes.

This explains a lot. Basically, studies have found that a specific part of the brain behaves differently in anxious individuals, and this difference might explain why they struggle with emotional control. It’s like a traffic jam in the brain that makes it harder for the signals to get through, leading to difficulties in managing emotional reactions.

Anxious individuals consistently fail in controlling emotional behavior, leading to excessive avoidance, a trait that prevents learning through exposure. Although the origin of this failure is unclear, one candidate system involves control of emotional actions, coordinated through lateral frontopolar cortex (FPl) via amygdala and sensorimotor connections. Using structural, functional, and neurochemical evidence, we show how FPl-based emotional action control fails in highly-anxious individuals. Their FPl is overexcitable, as indexed by GABA/glutamate ratio at rest, and receives stronger amygdalofugal projections than non-anxious male participants. Yet, high-anxious individuals fail to recruit FPl during emotional action control, relying instead on dorsolateral and medial prefrontal areas. This functional anatomical shift is proportional to FPl excitability and amygdalofugal projections strength. The findings characterize circuit-level vulnerabilities in anxious individuals, showing that even mild emotional challenges can saturate FPl neural range, leading to a neural bottleneck in the control of emotional action tendencies.

I turn 42 later this year, and this would explain a lot. Not in terms of me being unable to be super-efficient and productive, but just in terms of seeing connections everywhere.

In a systematic review recently published in the journal Psychophysiology, researchers from Monash University in Australia swept through the scientific literature, seeking to summarize how the connectivity of the human brain changes over our lifetimes. The gathered evidence suggests that in the fifth decade of life (that is, after a person turns 40), the brain starts to undergo a radical “rewiring” that results in diverse networks becoming more integrated and connected over the ensuing decades, with accompanying effects on cognition.

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Early on, in our teenage and young adult years, the brain seems to have numerous, partitioned networks with high levels of inner connectivity, reflecting the ability for specialized processing to occur. That makes sense, as this is the time when we are learning how to play sports, speak languages, and develop talents. Around our mid-40s, however, that starts to change. Instead, the brain begins becoming less connected within those separate networks and more connected globally across networks. By the time we reach our 80s, the brain tends to be less regionally specialized and instead broadly connected and integrated.

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“During the early years of life, there is a rapid organization of functional brain networks. A further refinement of the functional networks then takes place until around the third and fourth decade of life. A multi-faceted interplay of potentially harmful and compensatory changes can follow in aging,” the reviewers concluded.

I usually share climate-related stuff over at extinction.fyi but this is too good (and scary) an article not to cross-post.

The particular danger, according to the Nature paper’s authors, is that even though change in a tipping element may happen slowly on a human timescale, once a certain threshold in the system is crossed, it can become unstoppable. This means that even if the planet’s temperature is stabilized, the transition of certain Earth systems from one state to another could pick up speed, like a rollercoaster car that’s already gone over the apex of a track.

The 7 climate tipping points that could change the world forever | Grist

🍲 Introducing ‘Food Grammar,’ the Unspoken Rules of Every Cuisine — "Grammars can even impose what is considered a food and what isn’t: Horse and rabbit are food for the French but not for the English; insects are food in Mexico but not in Spain. Moreover, just as “Hey, man!” is a friendly greeting for a buddy but maybe not for your boss, foods may not be suitable in all grammatical contexts. “A Frenchman would think it odd to drink white coffee with dinner and an Italian probably would resent being served spaghetti for breakfast,” writes Claude Fischler in “Food, Self and Identity.” By the same token, rice is appropriate for breakfast in Korea but not in Ireland."

The essence of this article is that food is a reflection of culture, and our views of other cultures can become ossified. A good read.

🌍 Scientists begin building highly accurate digital twin of our planet — "The digital twin of the Earth is intended to be an information system that develops and tests scenarios that show more sustainable development and thus better inform policies. "If you are planning a two-​metre high dike in The Netherlands, for example, I can run through the data in my digital twin and check whether the dike will in all likelihood still protect against expected extreme events in 2050," says Peter Bauer, deputy director for Research at the European Centre for Medium-​Range Weather Forecasts (ECMWF) and co-​initiator of Destination Earth. The digital twin will also be used for strategic planning of fresh water and food supplies or wind farms and solar plants."

This is the kind of thing that simultaneously fills me with hope and fear. On the one hand, such a great idea; on the other, if we get the model wrong, it could make things worse...

🤑 Why an Animated Flying Cat With a Pop-Tart Body Sold for Almost $600,000 — "The sale was a new high point in a fast-growing market for ownership rights to digital art, ephemera and media called NFTs, or “nonfungible tokens.” The buyers are usually not acquiring copyrights, trademarks or even the sole ownership of whatever it is they purchase. They’re buying bragging rights and the knowledge that their copy is the “authentic” one."

I've got a blog post percolating in my mind at the moment about digital reserve currencies, NFTs and deepfakes. There's something here about an emerging hyper-capitalist dystopia, for sure.

Quotation-as-title by Oscar Wilde. Image by Tu Tram Pham.

Umm…

Several studies have found that, on average, there’s some physical similarity between one’s parent and one’s partner. That is, your girlfriend might well look a little bit like your mother. This physical similarity is apparent whether you ask strangers to compare facial photos of partners and parents, or whether you assess things such as parent and partner height, hair or eye colour, ethnicity, or even body hair.

A wonderful study of all known couples in Iceland across a 165-year period found that those with the most grandchildren were related at about the level of third or fourth cousin – no more, no less. So it seems there is some evolutionary advantage to finding traces of parental features attractive.