How Do Fireflies Flash in Sync? Studies Suggest a New Answer. | Quanta Magazine

A similar scenario played out in the 1990s, when a Tennessee naturalist named Lynn Faust read the confident published assertion of a scientist named Jon Copeland that there were no synchronous fireflies in North America. Faust knew then that what she had been watching for decades in the nearby woods was something remarkable.

Faust invited Copeland and Moiseff, his collaborator, to see a species in the Great Smoky Mountains called Photinus carolinus. Clouds of the male fireflies fill forests and clearings, floating at about human height. Instead of blinking in tight coordination, these fireflies emit a burst of quick flashes within a few seconds, then go quiet for several times that long before loosing another burst. (Imagine a crowd of paparazzi waiting for celebrities to appear at regular intervals, snapping a salvo of photos at each appearance, and then twiddling their thumbs in the downtime.)

Copeland and Moiseff’s experiments showed that isolated P. carolinus fireflies really did try to flash on beat with a neighboring firefly — or a blinking LED — in a nearby jar. The team also set up high-sensitivity video cameras at the edges of fields and forest clearings to record flashes. Copeland went through the footage frame by frame, counting how many fireflies were illuminated at each moment. Statistical analysis of this painstakingly gathered data proved that all the fireflies within the cameras’ view at a scene really did emit flash bursts at regular, correlated intervals.

Two decades later, when Peleg and her postdoc, the physicist Raphaël Sarfati, set out to collect firefly data, better technology was available. They designed a system of two GoPro cameras placed a few feet apart. Because the cameras took 360-degree video, they could capture the dynamics of a firefly swarm from within, not just from the side. Instead of counting flashes by hand, Sarfati devised processing algorithms that could triangulate on firefly flashes caught by both cameras and then record not just when each blink happened but where it occurred in three-dimensional space.

Sarfati first brought this system into the field in Tennessee in June 2019 for the P. carolinus fireflies that Faust had made famous. It was his first time seeing the spectacle with his own eyes. He had imagined something like the tight scenes of firefly synchrony from Asia, but the Tennessee bursts were messier, with bursts of up to eight quick flashes over about four seconds repeated roughly every 12 seconds. Yet that messiness was exciting: As a physicist, he felt that a system with wild fluctuations could prove far more informative than one that behaved perfectly. “It was complex, it was confusing in a sense, but also beautiful,” he said.

Random but Sympathetic Flashers

In her undergraduate brush with synchronizing fireflies, Peleg first learned to understand them through a model proposed by the Japanese physicist Yoshiki Kuramoto. This is the ur-model of synchrony, the granddaddy of mathematical schemes that explain how synchrony can arise, often inexorably, in anything from groups of pacemaker cells in human hearts to alternating currents.

At their most basic, models of synchronous systems need to describe two processes. One is the inner dynamics of an isolated individual — in this case a lone firefly in a jar, governed by a physiological or behavioral rule that determines when it flashes. The second is what mathematicians call coupling, the way the flash of one firefly influences its neighbors. With fortuitous combinations of these two parts, a cacophony of different agents can quickly pull itself into a neat chorus.

In a Kuramoto-esque description, each individual firefly is treated as an oscillator with an intrinsic preferred rhythm. Picture fireflies as having a hidden pendulum swinging steadily inside them; imagine a bug flashes every time its pendulum sweeps through the bottom of its arc. Suppose also that seeing a neighboring flash yanks a firefly’s pace-setting pendulum a little bit forward or back. Even if the fireflies start off out of sync with each other, or their preferred internal rhythms vary individually, a collective governed by these rules will often converge on a coordinated flash pattern.

Several variations on this general scheme have emerged over the years, each tweaking the rules of internal dynamics and coupling. In 1990, Strogatz and his colleague Rennie Mirollo of Boston College proved that a very simple set of firefly-like oscillators would almost always synchronize if you interconnected them, no matter how many individuals you included. The next year, Ermentrout described how groups of Pteroptyx malaccae fireflies in Southeast Asia could synchronize by speeding up or slowing down their internal frequencies. As recently as 2018, a group led by Gonzalo Marcelo Ramírez-Ávila of the Higher University of San Andrés in Bolivia devised a more complicated scheme in which fireflies switched back and forth between a “charging” state and a “discharging” state during which they flashed.

But when Peleg and Sarfati’s cameras began capturing three-dimensional data from the burst-then-wait Photinus carolinus fireflies in the Great Smokies in 2019, their analyses revealed new patterns.

One was the confirmation of something that Faust and other firefly naturalists had long reported: A burst of flashes would often start in one place and then cascade through the forest at about half a meter per second. The contagious ripples suggested that the coupling of fireflies was neither global (with the entire swarm connected) nor purely local (with each firefly caring only about close neighbors). Instead, the fireflies seemed to pay attention to other fireflies at a mix of distance scales. This could be because the fireflies can only see flashes that occur within an unbroken sightline, Sarfati said; in the forests, vegetation often gets in the way.

Real fireflies also seem to flout the core premise of Kuramoto-flavored models, which treat each individual as periodic. When Peleg and Sarfati released a single P. carolinus firefly in a tent, it emitted bursts of flashes randomly instead of following any strict rhythm. Sometimes it waited just a few seconds, other times a few minutes. “That already takes you out of the universe of all existing models,” Strogatz said.

But once the team dumped in 15 or more fireflies, the entire tent lighted up with collective flash bursts spaced about a dozen seconds apart. The synchrony and the group periodicity were purely emergent products of the fireflies hanging out together. In a draft paper uploaded to the biorxiv.org preprint server last spring, the Peleg group, working with the physicist Srividya Iyer-Biswas of Purdue University and the Santa Fe Institute, suggested a brand-new model for how this could happen.

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Studies Suggest a New Answer.”,”excerpt”:”u003cp>Field research suggests a new explanation for the synchronized flashing in fireflies and confirms that a novel form of “chimeric” synchrony occurs naturally.u003c/p>n”,”link”:” https://www.quantamagazine.org/?p=118926″,”date”:”2022-09-20T10:36:23″,”featured_media_image”:null,”authors”:[“type”:”id”,”generated”:true,”id”:”Post:118926.authors.0″,”typename”:”Author”],”tags”:[“type”:”id”,”generated”:true,”id”:”Post:118926.tags.0″,”typename”:”Term”,”type”:”id”,”generated”:true,”id”:”Post:118926.tags.1″,”typename”:”Term”,”type”:”id”,”generated”:true,”id”:”Post:118926.tags.2″,”typename”:”Term”,”type”:”id”,”generated”:true,”id”:”Post:118926.tags.3″,”typename”:”Term”,”type”:”id”,”generated”:true,”id”:”Post:118926.tags.4″,”typename”:”Term”],”podcast”:null,”acf”:”type”:”id”,”generated”:true,”id”:”$Post:118926.acf”,”typename”:”ACFFields”,”__typename”:”Post”,”status”:”publish”,”content”:””,”categories”:[“type”:”id”,”generated”:false,”id”:”Term:191″,”typename”:”Term”],”attachments”:null,”series_prev”:null,”series_next”:null,”next”:”type”:”id”,”generated”:true,”id”:”$Post:118926.next”,”typename”:”PostPageArchive”,”Post:118926.authors.0″:”name”:”Joshua Sokol”,”link”:” biology”,”link”:”https://www.quantamagazine.org/tag/mathematical-biology/”,”$Post:118926.acf”:”featured_block_title”:””,”kicker”:”type”:”id”,”generated”:true,”id”:”$Post:118926.acf.kicker”,”typename”:”Term”,”featured_image_default”:”type”:”id”,”generated”:true,”id”:”$Post:118926.acf.featured_image_default”,”typename”:”Image”,”featured_image_square”:”type”:”id”,”generated”:true,”id”:”$Post:118926.acf.featured_image_square”,”typename”:”Image”,”featured_image_full_width”:”type”:”id”,”generated”:true,”id”:”$Post:118926.acf.featured_image_full_width”,”typename”:”Image”,”featured_image_gif”:false,”featured_video”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/09/Firefly-Synchrony_2880x1220_HP.mp4″,”full_page_interactive”:false,”podcast_publish_date”:””,”__typename”:”ACFFields”,”interactive_type”:null,”iframe_url”:null,”return_cursor”:null,”exclude_blurb”:null,”interactive_html”:null,”interactive_css”:null,”interactive_js”:null,”interactive_blurb”:null,”related_article”:null,”modules”:[“type”:”id”,”generated”:true,”id”:”$Post:118926.acf.modules.0″,”typename”:”ACFCode”,”type”:”id”,”generated”:true,”id”:”$Post:118926.acf.modules.1″,”typename”:”ACFContent”,”type”:”id”,”generated”:true,”id”:”$Post:118926.acf.modules.2″,”typename”:”ACFImageComponent”,”type”:”id”,”generated”:true,”id”:”$Post:118926.acf.modules.3″,”typename”:”ACFContent”,”type”:”id”,”generated”:true,”id”:”$Post:118926.acf.modules.4″,”typename”:”ACFImageComponent”,”type”:”id”,”generated”:true,”id”:”$Post:118926.acf.modules.5″,”typename”:”ACFContent”],”template”:”article”,”subtitle”:”Field research suggests a new explanation for the synchronized flashing in fireflies and confirms that a novel form of “chimeric” synchrony occurs naturally.”,”title_layout”:”default”,”title_background_type”:null,”title_background_image”:null,”title_background_video”:null,”title_background_attribution”:null,”title_background_image_gif”:null,”title_overlay_enable”:null,”title_overlay_color”:null,”title_overlay_opacity”:null,”title_text_color”:null,”featured_image_attribution”:”u003cp>Ruiruito/Shutterstocku003c/p>n”,”featured_overlay_enable”:”false”,”featured_overlay_color”:null,”featured_overlay_opacity”:null,”series”:”type”:”id”,”generated”:true,”id”:”$Post:118926.acf.series”,”typename”:”Term”,”intro_content”:null,”make_image_full_width”:null,”hide_ad_on_post”:false,”$Post:118926.acf.kicker”:”name”:”mathematical biology”,”link”:” video of a firefly flashing its abdomen, with other seemingly synchronized flashes in the background.”,”caption”:””,”url”:” video of a firefly flashing its abdomen, with other seemingly synchronized flashes in the background.”,”caption”:””,”url”:” video of a firefly flashing its abdomen, with other seemingly synchronized flashes in the background.”,”caption”:””,”url”:” Writer”,”avatar”:”type”:”id”,”generated”:true,”id”:”$Post:118926.authors.0.acf.avatar”,”typename”:”Image”,”__typename”:”AuthorACF”,”$Post:118926.authors.0.acf.avatar”:”alt”:””,”caption”:””,”url”:” src=” autoplay=”autoplay” muted=”true” loop=”true” playsinline=”true” width=”100%” poster=” fireflies have a mystifying gift for flashing their abdomens in sync. New observations are overturning long-accepted explanations for how the synchronization occurs, at least for some species.u003c/p>n”,”attribution”:”u003cp>Ruiruito/Shutterstocku003c/p>n”,”mobile_code”:””,”mobile_caption”:””,”mobile_attribution”:””,”fadein”:false,”large_margin”:false,”placeholder”:”type”:”id”,”generated”:true,”id”:”$Post:118926.acf.modules.0.placeholder”,”typename”:”Image”,”__typename”:”ACFCode”,”$Post:118926.acf.modules.0.placeholder”:”alt”:null,”height”:null,”width”:null,”url”:null,”sizes”:”type”:”id”,”generated”:true,”id”:”$Post:118926.acf.modules.0.placeholder.sizes”,”typename”:”ImageSizes”,”__typename”:”Image”,”$Post:118926.acf.modules.0.placeholder.sizes”:”large”:null,”large_width”:null,”large_height”:null,”__typename”:”ImageSizes”,”$Post:118926.acf.modules.1″:{“hide_this_component”:null,”acf_fc_layout”:”content_area”,”show_sidebars”:true,”content”:”u003cp>In Japanese folk traditions, they symbolize departing souls or silent, ardent love. Some Indigenous cultures in the Peruvian Andes view them as the eyes of ghosts. And across various Western cultures, fireflies, glow-worms and other bioluminescent beetles have been linked to a dazzling and at times contradictory array of metaphoric associations: “childhood, crop, doom, elves, fear, habitat change, idyll, love, luck, mortality, prostitution, solstice, stars and fleetingness of words and cognition,” as one 2016 review noted.u003c/p>nu003cp>Physicists revere fireflies for reasons that might seem every bit as mystical: Of the roughly 2,200 species scattered around the world, a handful have the documented ability to flash in synchrony. In Malaysia and Thailand, firefly-studded mangrove trees can blink on beat as if strung up with Christmas lights; every summer in Appalachia, waves of eerie concordance ripple across fields and forests. The fireflies’ light shows lure mates and crowds of human sightseers, but they have also helped spark some of the most fundamental attempts to explain synchronization, the alchemy by which elaborate coordination emerges from even very simple individual parts.u003c/p>nu003cp>u003ca href=” Pelegu003c/a> remembers when she first encountered the mystery of synchronous fireflies as an undergraduate studying physics and computer science. The fireflies were presented as an example of how simple systems achieve synchrony in u003cem>Nonlinear Dynamics and Chaosu003c/em>, a textbook by the mathematician u003ca href=” Strogatzu003c/a> that her class was using. Peleg had never even seen a firefly, as they are uncommon in Israel, where she grew up.u003c/p>nu003cp>“It’s just so beautiful that it somehow stuck in my head for many, many years,” she said. But by the time Peleg began her own lab, applying computational approaches to biology at the University of Colorado and at the Santa Fe Institute, she had learned that although fireflies had inspired a lot of math, quantitative data describing what the insects were actually doing was scant.u003c/p>nu003cdiv id=’component-632ada9b7baec’ class=””>u003cscript type=”text/template”>”type”:”Image”,”id”:”component-632ada9b7baec”,”data”:”id”:118932,”src”:”https:\/\/d2r55xnwy6nx47.cloudfront.net\/uploads\/2022\/09\/peleg-sarfati.jpg”,”alt”:”Profile photos of Orit Peleg and Rapha\u00ebl Sarfati of the University of Colorado.”,”class”:””,”width”:2000,”height”:1181,”mobileSrc”:false,”zoomSrc”:false,”mobileZoomSrc”:false,”align”:”align=\”inline\””,”wrapper_width”:””,”caption”:”u003cp>Orit Peleg (left), a computational biologist at the University of Colorado, and Rapha\u00ebl Sarfati, a postdoctoral fellow in her laboratory, developed a more sophisticated system for capturing high-resolution data about the flashing of fireflies in the wild.u003c\/p>\n”,”attribution”:”u003cdiv>Glenn Asakawau003c\/div>\n”,”variant”:”shortcode”,”size”:”wide”,”disableZoom”:false,”disableMobileZoom”:false,”srcImage”:”ID”:118932,”id”:118932,”title”:”peleg-sarfati”,”filename”:”peleg-sarfati.jpg”,”filesize”:655181,”url”:”https:\/\/d2r55xnwy6nx47.cloudfront.net\/uploads\/2022\/09\/peleg-sarfati.jpg”,”link”:”https:\/\/www.quantamagazine.org\/how-do-fireflies-flash-in-sync-studies-suggest-a-new-answer-20220920\/peleg-sarfati\/”,”alt”:”Profile photos of Orit Peleg and Rapha\u00ebl Sarfati of the University of Colorado.”,”author”:”42689″,”description”:””,”caption”:””,”name”:”peleg-sarfati”,”status”:”inherit”,”uploaded_to”:118926,”date”:”2022-09-19 19:08:46″,”modified”:”2022-09-19 21:00:39″,”menu_order”:0,”mime_type”:”image\/jpeg”,”type”:”image”,”subtype”:”jpeg”,”icon”:”https:\/\/api.quantamagazine.org\/wp-includes\/images\/media\/default.png”,”width”:2000,”height”:1181,”sizes”:”thumbnail”:”https:\/\/d2r55xnwy6nx47.cloudfront.net\/uploads\/2022\/09\/peleg-sarfati-520×307.jpg”,”thumbnail-width”:520,”thumbnail-height”:307,”medium”:”https:\/\/d2r55xnwy6nx47.cloudfront.net\/uploads\/2022\/09\/peleg-sarfati-1720×1016.jpg”,”medium-width”:1720,”medium-height”:1016,”medium_large”:”https:\/\/d2r55xnwy6nx47.cloudfront.net\/uploads\/2022\/09\/peleg-sarfati-768×454.jpg”,”medium_large-width”:768,”medium_large-height”:454,”large”:”https:\/\/d2r55xnwy6nx47.cloudfront.net\/uploads\/2022\/09\/peleg-sarfati.jpg”,”large-width”:2000,”large-height”:1181,”1536×1536″:”https:\/\/d2r55xnwy6nx47.cloudfront.net\/uploads\/2022\/09\/peleg-sarfati-1536×907.jpg”,”1536×1536-width”:1536,”1536×1536-height”:907,”2048×2048″:”https:\/\/d2r55xnwy6nx47.cloudfront.net\/uploads\/2022\/09\/peleg-sarfati.jpg”,”2048×2048-width”:2000,”2048×2048-height”:1181,”square_small”:”https:\/\/d2r55xnwy6nx47.cloudfront.net\/uploads\/2022\/09\/peleg-sarfati-160×160.jpg”,”square_small-width”:160,”square_small-height”:160,”square_large”:”https:\/\/d2r55xnwy6nx47.cloudfront.net\/uploads\/2022\/09\/peleg-sarfati-520×520.jpg”,”square_large-width”:520,”square_large-height”:520,”largeForPrint”:true,”externalLink”:””,”original_resolution”:falseu003c/script>u003c/div>nu003cp>She set out to fix that. In the last two years, a series of papers from Peleg’s group have opened a fire hose of real-world data about synchrony in multiple firefly species at multiple study sites, and at a much higher resolution than previous modelers or biologists had managed. “Pretty astonishing” is how the mathematical biologist u003ca href=” Ermentroutu003c/a> at the University of Pittsburgh described the team’s results to u003cem>Quantau003c/em>. “I was blown away,” said u003ca href=” Moiseffu003c/a>, a biologist at the University of Connecticut.u003c/p>nu003cp>These papers establish that real firefly swarms depart from the mathematical idealizations that flitted through journals and textbooks for decades. Nearly every model for firefly synchrony ever concocted, for example, assumes that each firefly maintains its own internal metronome. A preprint that Peleg’s group u003ca href=” in Marchu003c/a>, however, showed that in at least one species, individual fireflies have no intrinsic rhythm, and it posited that a collective beat emerges only from the spooky synergy of many lightning bugs gathered together. An u003ca href=” more recent preprintu003c/a>, first uploaded in May and updated last week, documented a u003ca href=” type of synchronyu003c/a> that mathematicians call a chimera state, which has u003ca href=” never been observedu003c/a> in the real world outside of contrived experiments.u003c/p>nu003cp>Firefly biologists hope the new methods will reshape the science and conservation of fireflies. Mathematicians cranking out theories of synchrony like the ones that Strogatz described in his textbook, meanwhile, have long spun out models without much experimental feedback from messy real-world synchronizers. “That’s the big breakthrough,” said Strogatz, a professor of mathematics at Cornell University. “Now we can start closing the loop.”u003c/p>nu003ch2>u003cstrong>The Elusive Proof of Synchronyu003c/strong>u003c/h2>nu003cp>Reports of fireflies flaring in unison in Southeast Asia filtered back to Western scientific discourse for centuries. Thousands of fireflies, called u003cem>kelip-kelipu003c/em> in Malaysia — their name is a sort of visual onomatopoeia for their twinkling — can settle on riverside trees. “Their light blazes and is extinguished by a common sympathy,” a British diplomat touring Thailand u003ca href=” in 1857u003c/a>. “At one moment every leaf and branch appears decorated with diamond-like fire.”u003c/p>nu003cp>Not everyone accepted these reports. “For such a thing to occur among insects is certainly contrary to all natural laws,” one letter to the journal u003cem>Scienceu003c/em> complained in 1917, arguing that the apparent effect was instead caused by the viewer’s involuntary blinking. Yet by the 1960s, visiting firefly researchers confirmed through quantitative analysis what local boatmen in mangrove swamps had long known.u003c/p>n”,”fadein”:false,”__typename”:”ACFContent”},”$Post:118926.acf.modules.2″:”hide_this_component”:null,”acf_fc_layout”:”image_component”,”layout”:”medium”,”settings”:””,”attribution”:”u003cp>Jason Gambone Photographyu003c/p>n”,”caption”:”u003cp>Fireflies of the species u003cem>Photinus carolinusu003c/em> are one of a handful of species known to flash in sync. This photograph of the fireflies is a composite of multiple 30-second exposures merged together.u003c/p>n”,”mobile_comp_caption”:””,”mobile_comp_attribution”:””,”sets”:[“type”:”id”,”generated”:true,”id”:”$Post:118926.acf.modules.2.sets.0″,”typename”:”ImageSet”],”__typename”:”ACFImageComponent”,”$Post:118926.acf.modules.2.sets.0″:”settings”:””,”image”:”type”:”id”,”generated”:true,”id”:”$Post:118926.acf.modules.2.sets.0.image”,”typename”:”Image”,”mobile_image”:”type”:”id”,”generated”:true,”id”:”$Post:118926.acf.modules.2.sets.0.mobile_image”,”typename”:”Image”,”mobile_side_margins”:false,”mobile_width_constraint”:””,”mobile_caption”:””,”mobile_attribution”:””,”zoom_image”:”type”:”id”,”generated”:true,”id”:”$Post:118926.acf.modules.2.sets.0.zoom_image”,”typename”:”Image”,”zoom_caption”:””,”zoom_attribution”:””,”mobile_zoom_image”:”type”:”id”,”generated”:true,”id”:”$Post:118926.acf.modules.2.sets.0.mobile_zoom_image”,”typename”:”Image”,”mobile_zoom_caption”:””,”mobile_zoom_attribution”:””,”external_link”:””,”__typename”:”ImageSet”,”$Post:118926.acf.modules.2.sets.0.image”:{“alt”:”Composite shot photography of fireflies moving through a forest at night, their synchronized flashes appearing as streaks.”,”caption”:””,”url”:” similar scenario played out in the 1990s, when a Tennessee naturalist named u003ca href=” Faustu003c/a> read the confident published assertion of a scientist named u003ca href=” Copelandu003c/a> that there were no synchronous fireflies in North America. Faust knew then that what she had been watching for decades in the nearby woods was something remarkable.u003c/p>nu003cp>Faust invited Copeland and Moiseff, his collaborator, to see a species in the Great Smoky Mountains calledu003cem> Photinus carolinusu003c/em>. Clouds of the male fireflies fill forests and clearings, floating at about human height. Instead of blinking in tight coordination, these fireflies emit a burst of quick flashes within a few seconds, then go quiet for several times that long before loosing another burst. (Imagine a crowd of paparazzi waiting for celebrities to appear at regular intervals, snapping a salvo of photos at each appearance, and then twiddling their thumbs in the downtime.)u003c/p>nu003cdiv id=’component-632ada9b835bd’ class=””>u003cscript type=”text/template”>”type”:”Blockquote”,”id”:”component-632ada9b835bd”,”data”:”quote”:”u003cp>Even basic synchrony has always posed an evolutionary mystery: How does blending in help any individual male stand out to a potential mate?u003c\/p>\n”,”alignment”:”right”,”quote_attribution”:””,”twitter_text”:””u003c/script>u003c/div>nu003cp>Copeland and Moiseff’s experiments showed that isolated u003cem>P. carolinusu003c/em> fireflies really did try to flash on beat with a neighboring firefly — or a blinking LED — in a nearby jar. The team also set up high-sensitivity video cameras at the edges of fields and forest clearings to record flashes. Copeland went through the footage frame by frame, counting how many fireflies were illuminated at each moment. Statistical analysis of this painstakingly gathered data proved that all the fireflies within the cameras’ view at a scene really did emit flash bursts at regular, correlated intervals.u003c/p>nu003cp>Two decades later, when Peleg and her postdoc, the physicist u003ca href=” Sarfatiu003c/a>, set out to collect firefly data, better technology was available. They designed a system of two GoPro cameras placed a few feet apart. Because the cameras took 360-degree video, they could capture the dynamics of a firefly swarm from within, not just from the side. Instead of counting flashes by hand, Sarfati devised processing algorithms that could triangulate on firefly flashes caught by both cameras and then record not just when each blink happened but where it occurred in three-dimensional space.u003c/p>nu003cp>Sarfati first brought this system into the field in Tennessee in June 2019 for the u003cem>P. carolinus u003c/em>fireflies that Faust had made famous. It was his first time seeing the spectacle with his own eyes. He had imagined something like the tight scenes of firefly synchrony from Asia, but the Tennessee bursts were messier, with bursts of up to eight quick flashes over about four seconds repeated roughly every 12 seconds. Yet that messiness was exciting: As a physicist, he felt that a system with wild fluctuations could prove far more informative than one that behaved perfectly. “It was complex, it was confusing in a sense, but also beautiful,” he said.u003c/p>nu003ch2>u003cstrong>Random but Sympathetic Flashersu003c/strong>u003c/h2>nu003cp>In her undergraduate brush with synchronizing fireflies, Peleg first learned to understand them through a model proposed by the Japanese physicist u003ca href=” Kuramotou003c/a>. This is the ur-model of synchrony, the granddaddy of mathematical schemes that explain how synchrony can arise, often inexorably, in anything from groups of pacemaker cells in human hearts to alternating currents.u003c/p>nu003cp>At their most basic, models of synchronous systems need to describe two processes. One is the inner dynamics of an isolated individual — in this case a lone firefly in a jar, governed by a physiological or behavioral rule that determines when it flashes. The second is what mathematicians call coupling, the way the flash of one firefly influences its neighbors. With fortuitous combinations of these two parts, a cacophony of different agents can quickly pull itself into a neat chorus.u003c/p>nu003cdiv id=’component-632ada9b8d7bb’ class=””>u003cscript type=”text/template”>”type”:”Image”,”id”:”component-632ada9b8d7bb”,”data”:”id”:118933,”src”:”https:\/\/d2r55xnwy6nx47.cloudfront.net\/uploads\/2022\/09\/Kuramoto.jpg”,”alt”:”portrait of an elderly Japanese man wearing a blue suit, a striped shirt, and polka-dotted tie. He has gold-rimmed glasses, and looks like he’s in the middle of explaining something.”,”class”:””,”width”:1179,”height”:909,”mobileSrc”:false,”zoomSrc”:false,”mobileZoomSrc”:false,”align”:”align=\”right\””,”wrapper_width”:””,”caption”:”u003cp>Yoshiki Kuramoto, a professor of physics at Kyoto University, developed the most famous model of synchronization in the 1970s and co-discovered the chimera state in 2001.u003c\/p>\n”,”attribution”:”u003cp>Tomoaki Sukezaneu003c\/p>\n”,”variant”:”shortcode”,”size”:”wide”,”disableZoom”:true,”disableMobileZoom”:false,”srcImage”:”ID”:118933,”id”:118933,”title”:”Kuramoto”,”filename”:”Kuramoto.jpg”,”filesize”:268744,”url”:”https:\/\/d2r55xnwy6nx47.cloudfront.net\/uploads\/2022\/09\/Kuramoto.jpg”,”link”:”https:\/\/www.quantamagazine.org\/how-do-fireflies-flash-in-sync-studies-suggest-a-new-answer-20220920\/kuramoto\/”,”alt”:”portrait of an elderly Japanese man wearing a blue suit, a striped shirt, and polka-dotted tie. He has gold-rimmed glasses, and looks like he’s in the middle of explaining something.”,”author”:”42689″,”description”:””,”caption”:””,”name”:”kuramoto”,”status”:”inherit”,”uploaded_to”:118926,”date”:”2022-09-19 19:08:49″,”modified”:”2022-09-19 21:03:01″,”menu_order”:0,”mime_type”:”image\/jpeg”,”type”:”image”,”subtype”:”jpeg”,”icon”:”https:\/\/api.quantamagazine.org\/wp-includes\/images\/media\/default.png”,”width”:1179,”height”:909,”sizes”:”thumbnail”:”https:\/\/d2r55xnwy6nx47.cloudfront.net\/uploads\/2022\/09\/Kuramoto-520×401.jpg”,”thumbnail-width”:520,”thumbnail-height”:401,”medium”:”https:\/\/d2r55xnwy6nx47.cloudfront.net\/uploads\/2022\/09\/Kuramoto.jpg”,”medium-width”:1179,”medium-height”:909,”medium_large”:”https:\/\/d2r55xnwy6nx47.cloudfront.net\/uploads\/2022\/09\/Kuramoto-768×592.jpg”,”medium_large-width”:768,”medium_large-height”:592,”large”:”https:\/\/d2r55xnwy6nx47.cloudfront.net\/uploads\/2022\/09\/Kuramoto.jpg”,”large-width”:1179,”large-height”:909,”1536×1536″:”https:\/\/d2r55xnwy6nx47.cloudfront.net\/uploads\/2022\/09\/Kuramoto.jpg”,”1536×1536-width”:1179,”1536×1536-height”:909,”2048×2048″:”https:\/\/d2r55xnwy6nx47.cloudfront.net\/uploads\/2022\/09\/Kuramoto.jpg”,”2048×2048-width”:1179,”2048×2048-height”:909,”square_small”:”https:\/\/d2r55xnwy6nx47.cloudfront.net\/uploads\/2022\/09\/Kuramoto-160×160.jpg”,”square_small-width”:160,”square_small-height”:160,”square_large”:”https:\/\/d2r55xnwy6nx47.cloudfront.net\/uploads\/2022\/09\/Kuramoto-520×520.jpg”,”square_large-width”:520,”square_large-height”:520,”largeForPrint”:false,”externalLink”:””,”original_resolution”:falseu003c/script>u003c/div>nu003cp>In a Kuramoto-esque description, each individual firefly is treated as an oscillator with an intrinsic preferred rhythm. Picture fireflies as having a hidden pendulum swinging steadily inside them; imagine a bug flashes every time its pendulum sweeps through the bottom of its arc. Suppose also that seeing a neighboring flash yanks a firefly’s pace-setting pendulum a little bit forward or back. Even if the fireflies start off out of sync with each other, or their preferred internal rhythms vary individually, a collective governed by these rules will often converge on a coordinated flash pattern.u003c/p>nu003cp>Several variations on this general scheme have emerged over the years, each tweaking the rules of internal dynamics and coupling. In 1990, Strogatz and his colleague u003ca href=” Mirollou003c/a> of Boston College proved that a very simple set of firefly-like oscillators would almost always synchronize if you interconnected them, no matter how many individuals you included. The next year, Ermentrout described how groups of u003cem>Pteroptyx malaccae u003c/em>fireflies in Southeast Asia could synchronize by speeding up or slowing down their internal frequencies. As recently as 2018, a group led by u003ca href=” Marcelo Ramírez-Ávilau003c/a> of the Higher University of San Andrés in Bolivia devised a more complicated scheme in which fireflies switched back and forth between a “charging” state and a “discharging” state during which they flashed.u003c/p>nu003cp>But when Peleg and Sarfati’s cameras began capturing three-dimensional data from the burst-then-wait u003cem>Photinus carolinusu003c/em> fireflies in the Great Smokies in 2019, their analyses revealed new patterns.u003c/p>nu003cp>One was the confirmation of something that Faust and other firefly naturalists had long reported: A burst of flashes would often start in one place and then cascade through the forest at about half a meter per second. The contagious ripples suggested that the coupling of fireflies was neither global (with the entire swarm connected) nor purely local (with each firefly caring only about close neighbors). Instead, the fireflies seemed to pay attention to other fireflies at a mix of distance scales. This could be because the fireflies can only see flashes that occur within an unbroken sightline, Sarfati said; in the forests, vegetation often gets in the way.u003c/p>nu003cp>Real fireflies also seem to flout the core premise of Kuramoto-flavored models, which treat each individual as periodic. When Peleg and Sarfati released a single u003cem>P. carolinusu003c/em> firefly in a tent, it emitted bursts of flashes randomly instead of following any strict rhythm. Sometimes it waited just a few seconds, other times a few minutes. “That already takes you out of the universe of all existing models,” Strogatz said.u003c/p>nu003cp>But once the team dumped in 15 or more fireflies, the entire tent lighted up with collective flash bursts spaced about a dozen seconds apart. The synchrony and the group periodicity were purely emergent products of the fireflies hanging out together. In u003ca href=” draft paperu003c/a> uploaded to the biorxiv.org preprint server last spring, the Peleg group, working with the physicist u003ca href=” Iyer-Biswasu003c/a> of Purdue University and the Santa Fe Institute, suggested a brand-new model for how this could happen.u003c/p>n”,”fadein”:false,”__typename”:”ACFContent”},”$Post:118926.acf.modules.4″:”hide_this_component”:null,”acf_fc_layout”:”image_component”,”layout”:”medium”,”settings”:””,”attribution”:”u003cp>Merrill Sherman/Quanta Magazineu003c/p>n”,”caption”:””,”mobile_comp_caption”:””,”mobile_comp_attribution”:””,”sets”:[“type”:”id”,”generated”:true,”id”:”$Post:118926.acf.modules.4.sets.0″,”typename”:”ImageSet”],”__typename”:”ACFImageComponent”,”$Post:118926.acf.modules.4.sets.0″:”settings”:””,”image”:”type”:”id”,”generated”:true,”id”:”$Post:118926.acf.modules.4.sets.0.image”,”typename”:”Image”,”mobile_image”:”type”:”id”,”generated”:true,”id”:”$Post:118926.acf.modules.4.sets.0.mobile_image”,”typename”:”Image”,”mobile_side_margins”:false,”mobile_width_constraint”:””,”mobile_caption”:””,”mobile_attribution”:”u003cp>Merrill Sherman/Quanta Magazineu003c/p>n”,”zoom_image”:”type”:”id”,”generated”:true,”id”:”$Post:118926.acf.modules.4.sets.0.zoom_image”,”typename”:”Image”,”zoom_caption”:””,”zoom_attribution”:””,”mobile_zoom_image”:”type”:”id”,”generated”:true,”id”:”$Post:118926.acf.modules.4.sets.0.mobile_zoom_image”,”typename”:”Image”,”mobile_zoom_caption”:””,”mobile_zoom_attribution”:””,”external_link”:””,”__typename”:”ImageSet”,”$Post:118926.acf.modules.4.sets.0.image”:”alt”:”A graphic showing how fireflies with a tendency to flash randomly can get caught in a synchronized chorus of flashes.”,”caption”:””,”url”:” graphic showing how fireflies with a tendency to flash randomly can get caught in a synchronized chorus of flashes.”,”caption”:””,”url”:” an isolated firefly that has just emitted a burst of flashes, and consider the following rules. If you sequester it now, it will wait a random interval before flashing again. There is, however, a minimum wait time that the insect needs for recharging its light organs. This firefly is also susceptible to peer pressure: If it sees another firefly starting to flash, it will flash too, as long as it physically can.u003c/p>nu003cp>Now picture a whole field of fireflies in the quiet darkness immediately following a burst. Each one picks a random wait time longer than the charging period. Whoever flashes first, though, inspires all the others to jump in immediately. This entire process repeats each time the field goes dark. As the number of fireflies increases, it becomes increasingly likely that at least one will randomly choose to flash again as soon as it’s biologically possible, and that will set off the rest. As a result, the time between bursts shortens toward the minimum wait time. Any scientists gawking at this scene will see what looks like a steady group rhythm of light rolling into darkness, and then darkness erupting with light.u003c/p>nu003cp>A u003ca href=” preprintu003c/a> from the Peleg group unearthed another exotic pattern. In Congaree National Park in South Carolina, Peleg noticed something odd when her team trained their equipment on the synchronizing firefly u003cem>Photuris frontalis. u003c/em>“I remember seeing out of the corner of my eye that there is this little firefly that is really not on beat. But he is still punctual,” she said.u003c/p>nu003cdiv id=’component-632ada9b954d8′ class=””>u003cscript type=”text/template”>”type”:”Blockquote”,”id”:”component-632ada9b954d8″,”data”:”quote”:”u003cp>[Fireflies] have been doing computer science well before we even existed.u003c\/p>\n”,”alignment”:”right”,”quote_attribution”:”u003cp>Andrew Moiseff, University of Connecticutu003c\/p>\n”,”twitter_text”:””u003c/script>u003c/div>nu003cp>The team’s analysis showed that while a main chorus of the fireflies flashed in rhythm, stubborn outliers refused to play along. They shared the same space and flashed with their own period, but they were out of phase with the surrounding symphony. Sometimes the outliers seemed to synchronize with each other; sometimes they just flashed asynchronously. Peleg’s group describes this as a chimera state, a form of synchrony first noted by Kuramoto in 2001 and explored by Strogatz and the mathematician u003ca href=” Abramsu003c/a> of Northwestern University in 2004 in a mathematically idealized form. A few u003ca href=” from neuroscientistsu003c/a> claim to have seen this kind of chimera synchrony in the activity of brain cells under certain experimental conditions, but otherwise it has not been observed in nature until now.u003c/p>nu003cp>It’s not yet clear why nature would favor the evolution of this hodgepodge state of synchronization rather than a more uniform one. But even basic synchrony has always posed an evolutionary mystery: How does blending in help any individual male stand out to a potential mate? Peleg suggested that studies looking at the behavioral patterns of female fireflies and not just the males might be informative. Her group has begun to do that with the u003cem>P. carolinusu003c/em> fireflies but not yet with the chimera-prone u003cem>P. frontalisu003c/em> species.u003c/p>nu003ch2>u003cstrong>Lightning-Bug Computer Scienceu003c/strong>u003c/h2>nu003cp>For modelers, the race is now on to encapsulate the observed firefly patterns in new and improved frameworks. Ermentrout has a paper under review that offers a different mathematical description of u003cem>Photinus carolinusu003c/em>: Suppose that instead of waiting a purely random amount of time beyond the compulsory minimum for recharging, the bugs are just noisy, irregular oscillators? The fireflies might then start to act like neatly periodic flashers only when gathered together. In computer simulations, this model also matches the Peleg group’s data. “Even though we didn’t program it in, things like the waves emerge,” Ermentrout said.u003c/p>nu003cdiv id=’component-632ada9b95d7f’ class=”related-list”>u003cscript type=”text/template”>”type”:”LinkList”,”id”:”component-632ada9b95d7f”,”data”:”title”:”Related:”,”class”:”related-list”,”links”:[“type”:”internal”,”link”:”https:\/\/www.quantamagazine.org\/physicists-discover-exotic-patterns-of-synchronization-20190404\/”,”title”:”Scientists Discover Exotic New Patterns of Synchronization”,”type”:”internal”,”link”:”https:\/\/www.quantamagazine.org\/out-of-sync-loners-may-secretly-protect-orderly-swarms-20200521\/”,”title”:”Out-of-Sync \u2018Loners\u2019 May Secretly Protect Orderly Swarms”,”type”:”internal”,”link”:”https:\/\/www.quantamagazine.org\/how-do-new-organs-evolve-a-beetle-gland-shows-the-way-20210816\/”,”title”:”How Do New Organs Evolve? A Beetle Gland Shows the Way.”]u003c/script>u003c/div>nu003cp>Peleg and Sarfati’s inexpensive camera-and-algorithm system may greatly help to advance — and democratize — firefly research, biologists say. Fireflies are difficult to study in the wild because telling species apart by their flashes is hard for all but the most dedicated researchers and hardcore hobbyists. This makes measuring the range and abundance of firefly populations challenging even while fears mount that many lightning bug species are on the road to extinction. The new setup can make it easier to collect, analyze and share firefly-flashing data.u003c/p>nu003cp>In 2021, Sarfati used the system to confirm a report from Arizona that the local species u003cem>Photinus knulliu003c/em> can synchronize when enough of the fireflies gather together. This year Peleg’s laboratory sent 10 copies of the camera system to firefly researchers all over the U.S. They’re now taking in data from the light shows produced this past summer by eight species. With an eye toward boosting conservation efforts, a group of machine learning researchers within the Peleg lab are trying to train an algorithm to identify species from the flash patterns in the recorded footage.u003c/p>nu003cp>Cartoonish models of fireflies inspired mathematical theory for decades; Peleg hopes the more nuanced truths now emerging will be similarly consequential.u003c/p>nu003cp>Moiseff shares that hope. Fireflies “have been doing computer science well before we even existed,” he said. Learning how they synchronize could lead to a better grasp of self-organizing behaviors in other living things too.u003c/p>nu003cp>u003cstrong>u003cem>Editor’s note:u003c/em>u003c/strong>u003cem> Steven Strogatz is the host of u003c/em>Quantau003cem>’s u003c/em>Joy of Whyu003cem> podcast and a member of u003c/em>Quantau003cem>’s advisory board.u003c/em>u003c/p>n”,”fadein”:false,”__typename”:”ACFContent”,”$Post:118926.acf.series”:”name”:null,”link”:null,”__typename”:”Term”,”$Post:118926.next.data.0″:”title”:”How Mathematical Curves Enable Advanced Communication”,”link”:”https://www.quantamagazine.org/how-mathematical-curves-power-cryptography-20220919/”,”categories”:[“type”:”id”,”generated”:true,”id”:”$Post:118926.next.data.0.categories.0″,”typename”:”Term”,”type”:”id”,”generated”:true,”id”:”$Post:118926.next.data.0.categories.1″,”typename”:”Term”],”featured_media_image”:null,”acf”:”type”:”id”,”generated”:true,”id”:”$Post:118926.next.data.0.acf”,”typename”:”ACFFields”,”__typename”:”Post”,”$Post:118926.next.data.0.categories.0″:”slug”:”abstractions”,”__typename”:”Term”,”$Post:118926.next.data.0.categories.1″:”slug”:”mathematics”,”__typename”:”Term”,”$Post:118926.next.data.0.acf”:”template”:”article”,”featured_block_title”:””,”featured_image_gif”:false,”featured_image_default”:”type”:”id”,”generated”:true,”id”:”$Post:118926.next.data.0.acf.featured_image_default”,”typename”:”Image”,”featured_image_full_width”:”type”:”id”,”generated”:true,”id”:”$Post:118926.next.data.0.acf.featured_image_full_width”,”typename”:”Image”,”__typename”:”ACFFields”,”$Post:118926.next.data.0.acf.featured_image_default”:”alt”:”A spacecraft, laptop, QR code and CD”,”caption”:””,”url”:” spacecraft, laptop, QR code and CD”,”caption”:””,”url”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2050/09/Interpolation-Applications_2880x1220_HP-scaled.jpg”,”width”:2560,”height”:1084,”sizes”:”type”:”id”,”generated”:true,”id”:”$Post:118926.next.data.0.acf.featured_image_full_width.sizes”,”typename”:”ImageSizes”,”__typename”:”Image”,”$Post:118926.next.data.0.acf.featured_image_full_width.sizes”:”thumbnail”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2050/09/Interpolation-Applications_2880x1220_HP-520×220.jpg”,”square_small”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2050/09/Interpolation-Applications_2880x1220_HP-160×160.jpg”,”square_large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2050/09/Interpolation-Applications_2880x1220_HP-520×520.jpg”,”medium”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2050/09/Interpolation-Applications_2880x1220_HP-1720×729.jpg”,”medium_large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2050/09/Interpolation-Applications_2880x1220_HP-768×325.jpg”,”large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2050/09/Interpolation-Applications_2880x1220_HP-scaled.jpg”,”__typename”:”ImageSizes”,”$Post:118926.next”:”data”:[“type”:”id”,”generated”:true,”id”:”$Post:118926.next.data.0″,”typename”:”Post”],”__typename”:”PostPageArchive”}n”,”settings”:{“socialLinks”:[“type”:”facebook”,”label”:”Facebook”,”url”:”https://www.facebook.com/QuantaNews”,”__typename”:”SocialMediaLink”,”type”:”twitter”,”label”:”Twitter”,”url”:”https://twitter.com/QuantaMagazine”,”__typename”:”SocialMediaLink”,”type”:”youtube”,”label”:”YouTube”,”url”:”https://www.youtube.com/c/QuantaScienceChannel”,”__typename”:”SocialMediaLink”,”type”:”instagram”,”label”:”Instagram”,”url”:”https://instagram.com/quantamag”,”__typename”:”SocialMediaLink”,”type”:”rss”,”label”:”RSS”,”url”:”https://api.quantamagazine.org/feed/”,”__typename”:”SocialMediaLink”],”newsletterAction”:”https://quantamagazine.us1.list-manage.com/subscribe/post?u=0d6ddf7dc1a0b7297c8e06618&id=f0cb61321c”,”newsletterUrl”:”http://us1.campaign-archive2.com/home/?u=0d6ddf7dc1a0b7297c8e06618&id=f0cb61321c”,”sfNotice”:”An editorially independent publication supported by the Simons Foundation.”,”commentsHeader”:”

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