Gwada-negative: the rarest blood group on Earth

Source: The Conversation – UK – By Martin L. Olsson, Medical Director of the Nordic Reference Laboratory for Blood Group Genomics, Region Skåne & Professor of Transfusion Medicine, Head of the Division, Lund University

Peter Porrini/Shutterstock.com

In a routine blood test that turned extraordinary, French scientists have identified the world’s newest and rarest blood group. The sole known carrier is a woman from Guadeloupe whose blood is so unique that doctors couldn’t find a single compatible donor.

The discovery of the 48th recognised blood group, called “Gwada-negative”, began when the woman’s blood plasma reacted against every potential donor sample tested, including those from her own siblings. Consequently, it was impossible to find a suitable blood donor for her.

Most people know their blood type – A, B, AB or O – along with whether they are Rh-positive or negative. But these familiar categories (those letters plus “positive” or “negative”) represent just two of several dozens of blood group systems that determine compatibility for transfusions. Each system reflects subtle but crucial differences in the proteins and sugars coating our red blood cells.

To solve the mystery of the Guadeloupian woman’s incompatible blood, scientists turned to cutting-edge genetic analysis. Using whole exome sequencing – a technique that examines all 20,000-plus human genes – they discovered a mutation in a gene called PIGZ.

This gene produces an enzyme responsible for adding a specific sugar to an important molecule on cell membranes. The missing sugar changes the structure of a molecule on the surface of red blood cells. This change creates a new antigen – a key feature that defines a blood group – resulting in an entirely new classification: Gwada-positive (having the antigen) or -negative (lacking it).

Using gene editing technology, the team confirmed their discovery by recreating the mutation in a lab. So red blood cells from all blood donors tested are Gwada-positive and the Guadeloupean patient is the only known Gwada-negative person on the planet.

The implications of the discovery extend beyond blood transfusions. The patient suffers from mild intellectual disability, and tragically, she lost two babies at birth – outcomes that may be connected to her rare genetic mutation.

The enzyme produced by the PIGZ gene operates at the final stage of building a complex molecule called GPI (glycosylphosphatidylinositol). Previous research has shown that people with defects in other enzymes needed for GPI assembly can experience neurological problems ranging from developmental delays to seizures. Stillbirths are also common among women with these inherited disorders.

Although the Caribbean patient is the only person in the world so far with this rare blood type, neurological conditions including developmental delay, intellectual disability and seizures have been noted in other people with defects in enzymes needed earlier in the GPI assembly line.

The Gwada discovery highlights both the marvels and challenges of human genetic diversity. Blood groups evolved partly as protection against infectious diseases (many bacteria, viruses and parasites use blood group molecules as entry points into cells). This means your blood type can influence your susceptibility to certain diseases.

But extreme rarity creates medical dilemmas. The French researchers acknowledge they cannot predict what would happen if Gwada-incompatible blood were transfused into the Guadeloupian woman. Even if other Gwada-negative people exist, they would be extremely difficult to locate. It is also unclear if they can become blood donors.

This reality points towards a futuristic solution: lab-grown blood cells. Scientists are already working on growing red blood cells from stem cells that could be genetically modified to match ultra-rare blood types. In the case of Gwada, researchers could artificially create Gwada-negative red blood cells by mutating the PIGZ gene.

Gwada is a colloquial term for Guadeloupe, a Caribbean island.
Shutterstock.com

A growing field

Gwada joins 47 other blood group systems recognised by the International Society of Blood Transfusion. Like most of these blood-group systems, it was discovered in a hospital lab where technicians were trying to find compatible blood for a patient.

The name reflects the case’s Caribbean roots: Gwada is slang for someone from Guadeloupe, giving this blood group both scientific relevance and cultural resonance.

As genetic sequencing becomes more advanced and widely used, researchers expect to uncover more rare blood types. Each discovery expands our understanding of human variation and raises fresh challenges for transfusion and other types of personalised medicine.

The Conversation

Martin L Olsson is a Wallenberg Clinical Scholar who receives research funding from Knut and Alice Wallenberg Foundation (grant no. 2020.0234). He holds other major grants from the Swedish Research Council (grant no. 2024-03772), the Novo Nordisk Foundation (grant no. NNF22OC0077684) and the Swedish government funds to university healthcare for clinical research (ALF grant no. 2022.0287). He is also a member of the International Society of Blood Transfusion (ISBT)’s Working Party on Red Cell Immunogenetics and Blood Group Terminology.

Jill Storry receives funding from the Swedish Research Council (grant no. 2024-03772). She is affiliated with, and the current senior Vice-President, of the International Society of Blood Transfusion, as well as a member of the society’s Working Party on Red Cell Immunogenetics and Blood Group Terminology.

ref. Gwada-negative: the rarest blood group on Earth – https://theconversation.com/gwada-negative-the-rarest-blood-group-on-earth-260155

The Story of a Heart by Rachel Clarke is a powerful account of one child’s gift to another

Source: The Conversation – UK – By Leah McLaughlin, Research Fellow in Health Services, Bangor University

What does it mean to save a life – and what does it cost? In The Story of a Heart, Rachel Clarke answers this not with slogans or sentiment, but with quiet, searing honesty. This book, which won this year’s Women’s prize for non-fiction, is about organ donation, yes, but it’s also about family, grief, love, courage, and the astonishing edges of human experience.

At its centre are two children: Max Johnson, a healthy, active nine-year-old whose heart suddenly begins to fail, and Keira Ball, another nine-year-old – vibrant, horse-loving, full of life who tragically dies in a car accident. In a moment of unimaginable grief, Keira’s parents donate her organs. Her heart goes to Max.

A child dies. A child lives.

That is the simple, brutal, beautiful truth this book never looks away from. But Clarke does more than tell the story of heart. She immerses us in it – every breath, every monitor beep, every unbearable choice.

I read this as a health services researcher who has spent years working in the emotionally complex, ethically charged, and often hidden world of organ donation. My work explores how families navigate these unimaginable scenarios, particularly in the context of recent legislative change. Clarke’s account captures, with rare precision and compassion, the silences, the emotional labour of clinicians, and the profound weight of choice that families like Keira’s carry.


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As both a doctor and a mother, Clarke brings sensitivity to every page. We feel Max’s steady decline: the exhaustion, the fear, the silence that descends as even the doctors grow unsure. We witness Keira’s final hours, the heroic efforts to save her, and the moments where unbearable grief oscillates between hope and despair, eventually giving way to a different kind of gift.

There are no easy heroes in this story, only ordinary people facing the unthinkable with extraordinary grace. Clarke brings them to life with aching clarity: the cardiologist who, in the dim light of a hospital room, sketches Max’s failing heart on a napkin so his mother can understand what words can’t explain; the ICU nurse who stays long after her shift ends, gently brushing the hair of a child who will never wake up; the donation nurse who enters a family’s darkest hour not with answers, but with quiet presence and unwavering care; the surgeon who steadies his hands – and his heart – when every second matters.

And in the chaos of resuscitation, amid alarms and broken bodies, a teddy bear is tucked beneath Keira’s arm: “Someone in the crash team has seen Keira not simply as a body, inert and unresponsive, but as a vulnerable child in need of compassion.”

The Story of a Heart is also a book about history. It’s not just about one child’s transplant, but about medicine, surgery, and the heart itself. Clarke weaves in the stories of early transplant pioneers, accidental discoveries, and the scientific stumbles and breakthroughs that built modern practice. She brings it all to life with a storyteller’s flair, making science feel intimate, alive, and deeply human.

What the heart means

What sets the heart apart, Clarke reminds us, is not just its function, but its symbolism. No other organ holds such emotional weight. “Hearts sing, soar, race, burn, break, bleed, swell, hammer and melt,” she writes. They are not just organs, they are vessels for our hopes, fears and deepest longings.

Clarke shows how, across history, the heart was seen as the source of emotion, morality – even the soul – and how that deep humanism still pulses through our language and culture today. We have our hearts broken, wear our hearts on our sleeves, and as Clarke puts it: “When trying to express our truest and most sincere selves, we do so by saying we speak from the heart, or about all that our heart desires.”

But what makes The Story of a Heart so exceptional is its emotional truth. Clarke never shies away from the pain. Max’s parents watch their son fade, terrified to even touch him. Keira’s father buys her a pink princess dress for her funeral. Max, wired to machines, records a goodbye message; we learn later he even tried to take his own life. And yet, there is light.

Keira’s sisters climb into bed with her, painting her nails and sliding Haribo sweet rings onto her fingers. Then comes a moment so clear, so quietly astonishing, it takes everyone’s breath away. Katelyn, Keira’s older sister, turns to the doctor and asks, with calm, steady eyes: “Can we donate her organs?”

This isn’t a clinical decision or a well-rehearsed conversation. It is an unprompted act of extraordinary love. These moments – fragile, generous, profoundly human – are the true beating heart of Clarke’s book.

From there, we are guided into a world so few know and even fewer ever witness: the quiet choreography that carries a gift of life from one person to another. What Katelyn sets in motion with just five words unfolds with such precision, that reading it feels like witnessing a kind of living magic.

The aftermath is just as moving. Max recovers quickly, walks again, laughs again. The two families meet. There are no big speeches, just quiet awe. And beyond that: a law is passed. Max and Keira’s Law brings in an opt-out system of donation in England. Two children. One legacy. A country changed.

And still, Clarke doesn’t let us forget the hard truths. Not every child survives. Not every family gets a miracle. Transplants are fragile. But in that fragility, she shows us, is the real miracle. Max goes fishing with his dad, the sky glows orange – Keira’s favourite colour. That is enough.

At the moment organ donation consent rates for children are declining in the UK, and there are more children on the transplant wait list than ever before. The Story of a Heart asks us to see the children, the families, and the quiet acts of love behind every donation. It’s a powerful reminder that the greatest gifts are often given in the darkest hours.

This book will break your heart – and fill it up again. It’s not just essential reading for anyone interested in organ donation and transplant. It’s essential reading for anyone who has ever loved.

This article features references to books that have been included for editorial reasons, and may contain links to bookshop.org. If you click on one of the links and go on to buy something from bookshop.org The Conversation UK may earn a commission.

The Conversation

Leah McLaughlin does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. The Story of a Heart by Rachel Clarke is a powerful account of one child’s gift to another – https://theconversation.com/the-story-of-a-heart-by-rachel-clarke-is-a-powerful-account-of-one-childs-gift-to-another-260611

Parental leave in the UK isn’t working – here’s what needs to change

Source: The Conversation – UK – By Ernestine Gheyoh Ndzi, Senior Lecturer at York Business School, York St John University

pikselstock/Shutterstock

The recent launch of a government review into parental leave and pay in the UK is a hugely welcome development. In order to bring about meaningful change, it must challenge the fundamental issue at the heart of current parental leave laws. They are strongly influenced by, and so perpetuate, gender norms that see women as caregivers and fathers as breadwinners.

Parents in the UK can take maternity leave, paternity leave and shared parental leave in the first year of their child’s life. While these allowances provide parents with support, the support is disproportionate in how it is split between mothers and fathers. Although gender roles have evolved significantly, UK policies lag behind.

Mothers and fathers are equal parents and have equal parenting responsibilities. However, mothers are allowed up to 52 weeks of maternity leave, while fathers are only entitled to two weeks of statutory paternity leave.

The introduction of shared parental leave in 2015 was welcomed as a positive step towards gender equality – but it has failed in this aim.

There are significant barriers stopping fathers from benefiting fully from the legislation. Parents can share up to 50 weeks of leave between them. But because mothers are entitled to a year of leave, the policy requires mothers to act as gatekeepers. The mother determines if the father can share the leave and how long she is willing to give up for the father.

Consequently, fathers have no autonomy or independence to take parental leave at a time that is important to them and their babies – and they may be reluctant to deprive the mother of leave she is entitled to.

What’s more, while maternity and paternity leave is well known and the process relatively straightforward, shared parental leave has been criticised for its complexity. Parents that have explored shared parental leave have found the policy and process incredibly complex because some employers still don’t understand how it works and so are unable to support parents.

The problems with the policy have affected its uptake. Only 5% of fathers take any shared parental leave.

Financial implications

Another problem that affects all three policies is the pay. While the UK has a generous maternity leave allowance of 52 weeks, this is not accompanied by a decent financial allowance.

Although employers can set more generous terms, the law requires only the first six weeks of maternity leave to be paid at 90% of the mother’s salary. This is followed by 33 weeks at statutory pay of £187.18 and 13 weeks of no pay. The two weeks of paternity leave are paid at the statutory rate of £187.18, or 90% of the father’s average weekly earnings (whichever is lower).

Man and pregnant woman silhouetted, looking stressed
Taking parental leave can bring financial and career worries.
christinarosepix/Shutterstock

And while shared parental leave allows the mother to split 50 weeks of leave with her partner, a significant period of this is unpaid. Out of these 50 weeks, parents can share 37 weeks of pay at statutory rate and the rest of the leave would be unpaid.

Mothers have returned to work early because financially they cannot afford to stay longer on maternity leave – a problem compounded by the rising cost of living. Fathers sometimes opt to take annual leave rather than paternity leave because of the low pay.

The same reason applies to shared parental leave because parents cannot afford to both be off at the same time or different times on the statutory rate. While the policies are well intended, there is no financial incentive for parents to take it.

Finances have a significant impact on parental leave choices. The government review should enhance parental leave pay to encourage and support parents, particularly fathers.

Impact on careers

The implications for parents’ careers also need to be considered. While parental leave should not affect the career aspirations or progressions of the parents, my research demonstrates otherwise. Mothers have been bullied, refused opportunities, and have felt forced to leave their jobs.

Research also shows that fathers have concerns about their careers when considering parental leave. While it is illegal for an employer to discriminate against a parent for taking parental leave, this remains an area of concern.

My research has demonstrated that some fathers consider shared parental leave as a “luxury” they cannot afford. They feel they need to work hard to demonstrate their commitment to their job. Equal parenting policies would support women’s careers and encourage fathers to take up more family responsibilities without fear of repercussions.

The last point to consider – and one that often goes overlooked – is that how parents choose to feed their baby may have an effect on their decisions to take parental leave. Babies can be breastfed, formula fed or a mixture of both breast and formula feeding. If the parents make the decision to breastfeed – a choice recommended by the World Health Organisation – this may affect the mother’s decision on how much leave she takes.

Employers have legal obligations to carry out risk assessments for breastfeeding mothers and make reasonable adjustments on specific health and safety guidelines. However, a general policy that covers the wider needs of breastfeeding mothers and offers them more support at work should be implemented.

My research shows that mothers may prefer to take more maternity leave to enable them to breastfeed.

The parental leave review shouldn’t miss the opportunity to introduce breastfeeding policies that ensure mothers are properly supported in the workplace – as well as making sure that both mothers and fathers have the opportunity to prioritise caring and their careers.

The Conversation

Ernestine Gheyoh Ndzi does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. Parental leave in the UK isn’t working – here’s what needs to change – https://theconversation.com/parental-leave-in-the-uk-isnt-working-heres-what-needs-to-change-209661

China’s interest in the next Dalai Lama is also about control of Tibet’s water supply

Source: The Conversation – UK – By Tom Harper, Lecturer in International Relations, University of East London

As the 14th Dalai Lama celebrates his 90th birthday with thousands of Tibetan Buddhists, there’s already tension over how the next spiritual leader will be selected. Controversially, the Chinese government has suggested it wants more power over who is chosen.

Traditionally, Tibetan leaders and aides seek a young boy who is seen as the chosen reincarnation of the Dalai Lama. It is possible that after they do this, this time Beijing will try to appoint a rival figure.

However, the current Dalai Lama, who lives in exile in India, insists that the process of succession will be led by the Swiss-based Gaden Phodrang Trust, which manages his affairs. He said no one else had authority “to interfere in this matter” and that statement is being seen as a strong signal to China.


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Throughout the 20th century, Tibetans struggled to create an independent state, as their homeland was fought over by Russia, the UK and China. In 1951, Tibetan leaders signed a treaty with China allowing a Chinese military presence on their land.

China established the Tibetan Autonomous Region in 1965, in name this means that Tibet is an autonomous region within China, but in effect it is tightly controlled. Tibet has a government in exile, based in India, that still wants Tibet to become an independent state.

This is a continuing source of tension between the two countries. India also claims part of Tibet as its own territory.

Beijing sees having more power over the selection of the Dalai Lama as an opportunity to stamp more authority on Tibet. Tibet’s strategic position and its resources are extremely valuable to China, and play a part in Beijing’s wider plans for regional dominance, and in its aim of pushing back against India, its powerful rival in south Asia.

The Dalai Lama celebrates his 90th birthday as many Tibetans living in China fear talking about independence.

Tibet provides China with a naturally defensive border with the rest of southern Asia, with its mountainous terrain providing a buffer against India. The brief Sino-Indian war of 1962 when the two countries battled for control of the region, still has implications for India and China today, where they continue to dispute border lands.

As with many powerful nations, China has always been concerned about threats, or rival power bases, within its neighbourhood. This is similar to how the US has used the Monroe Doctrine to ensure its dominance over Latin America, and how Russia seeks to maintain its influence over former Soviet states.

Beijing views western criticism of its control of Tibet as interference in its sphere of influence.




Read more:
India and Pakistan tension escalates with suspension of historic water treaty


Another source of contention is that Beijing traditionally views boundaries such as the McMahon line defining the China-India border as lacking legitimacy, a border drawn up when China was at its weakest in the 19th century. Known in China as the “century of humiliation”, this was characterised by a series of unequal treaties, which saw the loss of territory to stronger European powers.

This continues to a source of political tensions in China’s border regions including Tibet. This is a controversial part of China’s historical memory and continues to influence its ongoing relationship with the west.

Demand for natural resources

Tibet’s importance to Beijing also comes from its vast water resources. Access to more water is seen as increasingly important for China’s wider push towards self-sufficiency which has become imperative in the face of climate change. This also provides China with a significant geopolitical tool.

For instance, the Mekong River rises in Tibet and flows through China and along the borders of Myanamar and Laos and onward into Thailand and Cambodia. It is the third longest river in Asia, and is crucial for many of the economies of south-east Asia. It is estimated to sustain 60 million people.

China’s attempts to control water supplies, particularly through the building of huge dams in Tibet, has added to regional tensions. Around 50% of the flow to the Mekong was cut off for part of 2021, after a Chinese mega dam was built. This caused a lot of resentment from other countries which depended on the water.

Moves by other nations to control access to regional water supplies in recent years show how water is now becoming a negotiating tool. India attempted to cut off Pakistan’s water supply in 2025 as part of the conflict between the two. Control of Tibet allows China to pursue a similar strategy, which grants Beijing leverage in its dealings with New Delhi, and other governments.

A map of Tibet and surrounding countries.

Shutterstock.

Another natural resource is also a vital part of China’s planning. Tibet’s significant lithium deposits are crucial for Chinese supply chains, particularly for their use in the electric vehicle industry. Beijing is attempting to reduce its reliance on western firms and supplies, in the face of the present trade tensions between the US and China, and Donald Trump’s tariffs on Chinese goods.

Tibet’s value to China is a reflection of wider changes in a world where water is increasingly playing an important role in geopolitics. With its valuable natural resources, China’s desire to control Tibet is not likely to decrease.

The Conversation

Tom Harper does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. China’s interest in the next Dalai Lama is also about control of Tibet’s water supply – https://theconversation.com/chinas-interest-in-the-next-dalai-lama-is-also-about-control-of-tibets-water-supply-255843

¿Qué le sucede a nuestro cerebro cuando vemos vídeos a velocidades más rápidas de lo normal?

Source: The Conversation – (in Spanish) – By Marcus Pearce, Reader in Cognitive Science, Queen Mary University of London

Pressmaster/Shutterstock

Muchos de nosotros hemos adquirido el hábito de escuchar pódcast, audiolibros y otros contenidos en línea a velocidades de reproducción más altas. Para los jóvenes, incluso podría ser la norma. Por ejemplo, una encuesta realizada a estudiantes de California reveló que el 89 % cambiaba la velocidad de reproducción de las clases online, mientras que en los medios de comunicación han aparecido numerosos artículos sobre cómo se ha generalizado el visionado rápido.

Es fácil pensar en las ventajas de ver las cosas más rápido. Te permite consumir más contenido en el mismo tiempo o repasar el mismo contenido varias veces para sacarle el máximo partido.

Esto podría ser especialmente útil en un contexto educativo, donde podría liberar tiempo para consolidar conocimientos, hacer pruebas prácticas, etc. Ver vídeos rápidamente también es potencialmente una buena forma de asegurarse de mantener la atención y el interés durante todo el tiempo que duran, evitando así que la mente se distraiga.

Pero ¿qué hay de las desventajas? Resulta que también hay más de una.

Cuando una persona se expone a información oral, los investigadores distinguen tres fases de la memoria: codificar la información, almacenarla y, posteriormente, recuperarla. En la fase de codificación, el cerebro necesita cierto tiempo para procesar y comprender el flujo de palabras que recibe. Las palabras deben extraerse y su significado contextual debe recuperarse de la memoria en tiempo real.

Las personas suelen hablar a una velocidad de unas 150 palabras por minuto, aunque duplicar la velocidad a 300 o incluso triplicarla a 450 palabras por minuto sigue estando dentro del rango de lo que podemos considerar inteligible. La cuestión es más bien la calidad y la longevidad de los recuerdos que formamos.

La información entrante se almacena temporalmente en un sistema de memoria llamado memoria de trabajo. Esto permite que los fragmentos de información se transformen, combinen y manipulen hasta alcanzar una forma lista para ser transferida a la memoria a largo plazo. Dado que nuestra memoria de trabajo tiene una capacidad limitada, si llega demasiada información demasiado rápido, esta puede desbordarse. Esto provoca una sobrecarga cognitiva y la pérdida de información.

Visualización rápida y recuperación de información

Un metaanálisis reciente examinó 24 estudios sobre el aprendizaje a partir de vídeos de conferencias. Los estudios variaban en su diseño, pero en general consistían en reproducir una videoconferencia a un grupo a velocidad normal (1x) y reproducir la misma videoconferencia a otro grupo a una velocidad mayor (1,25x, 1,5x, 2x y 2,5x).

Al igual que en un ensayo controlado aleatorio utilizado para probar tratamientos médicos, los participantes fueron asignados aleatoriamente a cada uno de los dos grupos. A continuación, ambos grupos realizaron una prueba idéntica después de ver el vídeo para evaluar sus conocimientos sobre el material. Las pruebas consistían en recordar información, responder a preguntas de opción múltiple para evaluar su capacidad de recuerdo, o ambas cosas.

Botones de reproducción
La reproducción más rápida puede no ayudar al estudio.
V.Studio

El metaanálisis mostró que aumentar la velocidad de reproducción tenía efectos cada vez más negativos en el rendimiento de la prueba. A velocidades de hasta 1,5 veces, el coste era muy pequeño. Pero a partir de 2 veces, el efecto negativo era de moderado a grande.

Para poner esto en contexto, si la puntuación media de un grupo de estudiantes era del 75 %, con una variación típica de 20 puntos porcentuales en cualquier dirección, aumentar la velocidad de reproducción a 1,5x reduciría el resultado medio de cada persona en 2 puntos porcentuales. Y aumentar la velocidad a 2,5x supondría una pérdida media de 17 puntos porcentuales.

La edad importa

Curiosamente, uno de los estudios incluidos en el metaanálisis también investigó a adultos mayores (de 61 a 94 años) y descubrió que se veían más afectados por ver contenidos a velocidades más rápidas que los adultos más jóvenes (de 18 a 36 años). Esto puede reflejar un debilitamiento de la capacidad de memoria en personas por lo demás sanas, lo que sugiere que los adultos mayores deberían visualizar los contenidos a velocidad normal o incluso a velocidades de reproducción más lentas para compensar.

Sin embargo, aún no sabemos si se pueden reducir los efectos negativos de la reproducción rápida haciéndolo con regularidad. Por lo tanto, podría ser que los adultos más jóvenes simplemente tengan más experiencia con la reproducción rápida y, por lo tanto, sean más capaces de hacer frente al aumento de la carga cognitiva. Del mismo modo, esto significa que no sabemos si las personas más jóvenes pueden mitigar los efectos negativos sobre su capacidad para retener información utilizando con más frecuencia la reproducción más rápida.

Otra incógnita es si ver vídeos a velocidades de reproducción más altas tiene efectos a largo plazo sobre la función mental y la actividad cerebral. En teoría, estos efectos podrían ser positivos, como una mayor capacidad para manejar una mayor carga cognitiva. O podrían ser negativos, como una mayor fatiga mental derivada del aumento de la carga cognitiva, pero actualmente carecemos de pruebas científicas para responder a esta pregunta.

Una última observación es que, incluso si reproducir el contenido a, por ejemplo, 1,5 veces la velocidad normal no afecta al rendimiento de la memoria, hay evidencia que sugiere que la experiencia es menos agradable. Eso puede afectar a la motivación y la experiencia de las personas a la hora de aprender cosas, lo que podría hacer que encontraran más excusas para no hacerlo. Por otro lado, la reproducción más rápida se ha popularizado, por lo que quizá, una vez que la gente se acostumbre, no haya ningún problema. Esperemos que en los próximos años comprendamos mejor estos procesos.

The Conversation

Marcus Pearce no recibe salario, ni ejerce labores de consultoría, ni posee acciones, ni recibe financiación de ninguna compañía u organización que pueda obtener beneficio de este artículo, y ha declarado carecer de vínculos relevantes más allá del cargo académico citado.

ref. ¿Qué le sucede a nuestro cerebro cuando vemos vídeos a velocidades más rápidas de lo normal? – https://theconversation.com/que-le-sucede-a-nuestro-cerebro-cuando-vemos-videos-a-velocidades-mas-rapidas-de-lo-normal-260870

How a lottery-style refund system could boost recycling

Source: The Conversation – Canada – By Jiaying Zhao, Associate Professor, Psychology, University of British Columbia

Imagine you’re standing at a bottle depot with an empty pop can. You can get a dime back, or you can take a chance at winning $1,000. Which would you choose?

Every year, the world produces two trillion beverage containers but only 34 per cent of glass bottles, 40 per cent of plastic bottles and 70 per cent of aluminium cans are recycled.

To increase recycling rates, many countries have adopted deposit refund systems, where you pay a small deposit, say 10 cents, when you buy an eligible beverage container and get this deposit back when you return it to a local depot.

Through this system, approximately 80 per cent of containers in British Columbia and almost 85 per cent of containers in Alberta are recovered. Still, that leaves millions of containers as litter, in landfills or incinerated every year, contributing to pollution and greenhouse gas emissions.

With Canada’s goal of zero plastic waste by 2030 drawing near, a new approach to recycling beverage containers could make a difference.

We recently conducted a research experiment to find out if more people would recycle more often if they had a chance to win a prize.

A lottery-style refund to boost recycling

Psychology research shows that people tend to prefer a small chance to win a large reward over a guaranteed small reward. For example, people would more often prefer a small chance to win $5,000 over receiving a $5 reward.

Applying this insight to recycling, we turned the small guaranteed refund of $0.10 in B.C. and Alberta into a 0.01 per cent chance of getting $1,000. We set up recycling tables at food courts in Vancouver and at a RibFest event in Spruce Grove, Alta.

When people brought their beverage containers to us to recycle, we presented them with five options for a refund. They could get their guaranteed 10 cents, or a chance to win a larger amount of money, the highest option being $1,000.

We found that people preferred the chance to win $1,000 over the other options, and they felt the happiest after making this choice.

To see if the lottery option actually increased recycling, we conducted an experiment where we told people ahead of time that they would get their guaranteed 10-cent refund or that they had a chance to win $1,000 for each bottle they brought to our study.

We found that people brought 47 per cent more beverage containers when we offered them a chance to win $1,000 than when we offered them the guaranteed refund.

Overall, our findings suggest that offering a chance to win a larger amount of money can meaningfully boost beverage container recycling. The excitement of a potential big win can motivate people who may not be enticed by the typical small, guaranteed refund.

Choice matters

A one-size-fits-all approach won’t work. People recycle for different reasons. They also have different risk tolerances, and some may rely on the guaranteed refund for additional income. To capture diverse preferences and needs, it’s vital that the lottery-style refund is offered in addition to the guaranteed refund, not instead of it.

It would also be beneficial to include smaller, more frequent prizes alongside the grand prize, so people win relatively frequently to keep motivations high.

This is Norway’s approach to their recycling lottery, with 39 per cent of people choosing the lottery option when they recycle. In 2023, Norway’s recycling lottery achieved a 92.3 per cent container return rate.

Importantly, our research does not capture people who collect large bags of containers to return to the depot. It’s possible that this demographic may have different preferences for the refund, and future research should examine this group in particular.

Green lottery for good

The lottery-style refund has the same expected payout as the 10-cent refund per bottle. This means that, on average, people will take home the same amount of money as with the guaranteed option, without incurring additional losses or gains. This benevolent factor distinguishes the lottery-style refund from other types of lotteries or gambling that often profit off the players.

Since the only way to enter this lottery-style refund is to recycle beverage containers, it’s impossible to directly re-enter any winnings into the lottery. There are also no near-misses, losses disguised as wins, exciting lights and sounds or other sensory stimulation often associated with gambling.

Some might be apprehensive about potential gambling dangers of creating a lottery system. However, there has not been a single case linking the recycling lottery to gambling addiction. There is also no evidence that purchases of beverage containers would increase as a result of the lottery-style refund.

Our study’s transparent design, with clear odds, ensures fairness, unlike casino games built to take players’ cash. For this approach to be successful, deposit refund systems must maintain this transparency in lottery-style program operations and payouts.

If done right, offering a chance to win a higher amount of money for recycling can meaningfully increase recycling rates, contribute to a circular economy and allow people to choose the refund option that works best for them.

The Conversation

Jiaying Zhao receives funding from the Social Sciences and Humanities Research Council of Canada.

Jade Radke receives funding from the Social Sciences and Humanities Research Council of Canada Doctoral Fellowship and the University of British Columbia Indigenous Graduate Fellowship.

ref. How a lottery-style refund system could boost recycling – https://theconversation.com/how-a-lottery-style-refund-system-could-boost-recycling-259896

The Great Lakes are powerful. Learning about ‘rip currents’ can help prevent drowning

Source: The Conversation – Canada – By Chris Houser, Professor in Department of Earth and Environmental Science, and Dean of Science, University of Waterloo

Between 2010 and 2017, there were approximately 50 drowning fatalities each year associated with rough surf and strong currents in the Great Lakes.

In addition to the personal loss experienced by family and friends, these drownings create an annual economic burden on the regional economy of around US$105 million, and that doesn’t include the direct costs of search and rescue.

Types of rip currents

Rip currents — commonly referred to as rips or colloquially as rip tides — are driven by the breaking of waves. These currents extend away from the shoreline and can flow at speeds easily capable of carrying swimmers far from the beach.

Structural rips are common throughout the Great Lakes (Grand Haven on the eastern shore of Lake Michigan, for example) and develop when groynes, jetties and rock structures deflect the alongshore current offshore, beyond the breaking waves. Depending on the waves and the structure, a shadow rip can also develop on the other side of the groyne or jetty.

Rips can also develop anywhere that variations in the bathymetry (the topography of the sand underwater) — such as nearshore bars — causes wave-breaking to vary along the beach, which makes the water thrown landward by the breaking waves return offshore as a concentrated flow at the water’s surface. These are known as channel or bathymetric rips and are they can form along sand beaches in the Great Lakes.

While it can be difficult to spot a channel rip, they can be identified by an area of relatively calm water between breaking waves, a patch of darker water or the offshore flow of water, sediment and debris.

A person caught in a rip is transported away from shore into deeper water, but they are not pulled under the water. If they are a weak swimmer or try to fight the current, they may panic and fail to find a way out of the rip and back to shore before submerging.

Rip current hazards

Most rip fatalities occur on unsupervised beaches or on supervised beaches when and where lifeguards are not present. While many popular beaches near large urban centres have lifeguards, many beaches don’t. Along just the east coast of Lake Huron, there are more than 40 public beaches, including Goderich, Bayfield, Southampton and Sauble Beach, but only two have lifeguard programs (Sarnia and Grand Bend).

Simple warning signs are used on many beaches, but visitors either don’t pay attention or don’t know how to interpret the warning.

Non-local visitors are a high-risk group for drownings. They are less likely to make safe swimming choices than residents or regular beach-goers, because visitors are generally unfamiliar with the beach and its safety measures, have poor knowledge of beach hazards like rip currents and breaking waves and are overconfident in their swimming ability.

Recent findings from a popular beach on Lake Huron suggest that those with less experience at the beach tend to make decisions of convenience rather than based on beach safety. Residents with greater knowledge of the local hazards tend to avoid swimming near where the rip can develop.

But even when people are aware of rip currents and other beach hazards, they may not make the right decisions. Despite the presence of warnings, people’s actions are greatly influenced by the behaviour of others, peer pressure and group-think. The social cost of not entering the water with the group may appear to outweigh the risk posed by entering the water.

Rip channel and current on Lake Huron. (Chris Houser)

The behaviour of beach users is affected by confirmation bias, a cognitive shortcut where a person selectively pays attention to evidence confirming their pre-existing beliefs and ignores evidence to the contrary. When someone enters the water and does not encounter strong waves or currents, they’re more likely to engage in risky behaviour on their next visit to that beach or a similar beach.

Vacationers and day visitors can stay safe only if they are aware that there is the potential for rip currents and rough surf at beaches in the Great Lakes. Just because a beach is accessible and has numerous attractions does not mean it is safe.

Advocating for beach safety

In the United States, the National Oceanographic and Atmospheric Administration runs programs designed to educate beach users about surf and rip hazards. But Canada hasn’t implemented a national beach safety strategy.

Education about rips and dangerous surf falls on the shoulders of advocates, many of whom have been impacted by a drowning in the Great Lakes. The Great Lakes Surf Rescue Project has been tracking and educating school and community groups about rip currents and rough surf in the Great Lakes since 2010.

Several new advocacy groups have started in recent years, including Kincardine Beach Safety on Lake Huron and the Rip Current Information Project on Lake Erie. Given that there is limited public interest in surf-related drownings and limited media coverage, these advocacy groups are helping to increase awareness of rip currents and rough surf across the Great Lakes.

To ensure a safe trip to the beach, beachgoers should seek out more information about rip currents and other surf hazards in the Great Lakes.

The Conversation

Chris Houser receives funding from NSERC.

ref. The Great Lakes are powerful. Learning about ‘rip currents’ can help prevent drowning – https://theconversation.com/the-great-lakes-are-powerful-learning-about-rip-currents-can-help-prevent-drowning-260060

The toxic management handbook: six guaranteed ways to make your best employees flee

Source: The Conversation – France – By George Kassar, Full-time Faculty, Research Associate, Performance Analyst, Ascencia Business School

If performance management is not implemented properly, it can demotivate and drive out employees. PeopleImages.comYuri A/Shutterstock

Who said that an organization’s main resource and true competitive advantage lies in its employees, their talent or their motivation? After all, maybe your real goal is to empty out your offices, permanently discourage your staff and methodically sabotage your human capital.

If that’s the case, research in performance management offers everything you need.

Originally rooted in early 20th-century rationalization methods, performance management has become a cornerstone of modern management. It has evolved to adapt to contemporary HR needs, focusing more on employee development, engagement and strategic alignment. In theory, it should help guide team efforts, clarify expectations and support individual development. But if poorly implemented, it can become a powerful tool to demotivate, exhaust and push out your most valuable employees.

Here’s how to scare off your best talent. Although the following guidelines are meant to be taken tongue-in-cheek, they remain active in the daily work of some managers.

Management by ‘vague’ objectives

Start by setting vague, unrealistic or contradictory goals. Above all, avoid giving goals meaning, linking them to a clear strategy or backing them with appropriate resources. In short, embrace the “real” SMART goals: stressful, arbitrary, ambiguous, repetitive, and totally disconnected from the field!

According to research in organizational psychology, this approach guarantees anxiety, confusion and disengagement among your teams, significantly increasing their intention to leave the company.

Silence Is Golden

Avoid all forms of dialogue and communication. Never give feedback. And if you absolutely must, do it rarely and irregularly, make sure it’s disconnected from actual work, and preferably in the form of personal criticism. The absence of regular, task-focused and actionable feedback leaves employees in uncertainty, catches them off-guard during evaluations and gradually undermines their engagement.

How your employees interpret your intentions and feedback matters most. Be careful though: if feedback is perceived as constructive, it may actually boost motivation and learning engagement. But if the same feedback is seen as driven by a manager’s personal agenda (or, ego-based attribution), it backfires, leading to demotivation, withdrawal and exit.

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Performance evaluation ‘trials’

Hold annual performance review meetings in which you focus solely on mistakes and completely ignore successes or invisible efforts. Be rigid, critical and concentrate only on weaknesses. Make sure to take full credit when the team succeeds; after all, without you, nothing would have been possible. On the other hand, when results fall short, don’t hesitate to highlight errors, assign individual blame and remind them that “you did warn them!”

This kind of performance evaluation, better described as a punitive trial, ensures deep demotivation and accelerates team turnover.

Internal competition, maxed out

Promote a culture of rivalry among colleagues: circulate internal rankings regularly, reward only the top performers, systematically eliminate the lowest ranked without even thinking of helping them improve, devalue the importance of cooperation and let internal competition do the rest. After all, these are the core features of the “famous” method popularized by the late Jack Welch at General Electric.

If you notice a short-term boost of motivation, don’t worry. The long-term effects of Welch’s “vitality curve” will be far more harmful than beneficial. Fierce internal competition is a great tool for destroying trust among teammates and creating a persistently toxic atmosphere, leading to an increase in the number of voluntary departures.

Ignore wellbeing and do not listen, no matter what

We’ve already established that feedback and dialogue should be avoided. But if, by misfortune, they do occur, make sure not to listen to complaints or warning signs related to stress or exhaustion. Offer no support or assistance, and of course, completely ignore the right to disconnect.

By neglecting mental health and refusing to help your employees find meaning in their work – especially when they perform tasks seen as meaningless, repetitive or emotionally draining – you directly increase the risk of burnout and chronic absenteeism.

In addition, always favour highly variable and poorly designed performance bonuses: this will heighten income instability and kill off whatever engagement remains.




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Meditation and mindfulness at work are welcome, but do they help avoid accountability for toxic culture?


The subtle art of wearing people down

Want to take your talent-repelling skills even further? Draw inspiration from what research identifies as practices and experiences belonging to the three major forms of workplace violence. These include micromanagement, constant pressure, lack of recognition, social isolation and others that generate long-term suffering. Though often invisible, their reoccurence gradually wears employees down mentally, then physically, until they finally break.


Obviously, these tips are meant to be taken ironically.

Yet, unfortunately, these toxic practices are all too real in the daily routines of certain managers. If the goal is truly to retain talent and ensure lasting business success, it is essential to centre performance management practices around meaning, fairness and the genuine development of human potential.

The Conversation

George Kassar ne travaille pas, ne conseille pas, ne possède pas de parts, ne reçoit pas de fonds d’une organisation qui pourrait tirer profit de cet article, et n’a déclaré aucune autre affiliation que son organisme de recherche.

ref. The toxic management handbook: six guaranteed ways to make your best employees flee – https://theconversation.com/the-toxic-management-handbook-six-guaranteed-ways-to-make-your-best-employees-flee-260733

Antidepressant withdrawal: new review downplays symptoms but misses the mark for long-term use

Source: The Conversation – UK – By Mark Horowitz, Visiting Clinical Research Fellow in Psychiatry, UCL

marevgenna/Shutterstock.com

A new review of antidepressant withdrawal effects – written by academics, many of whom have close ties to drug manufacturers – risks underestimating the potential harms to long-term antidepressant users by focusing on short-term, industry-funded studies.

There is growing recognition that stopping antidepressants – especially after long-term use – can cause severe and sometimes debilitating withdrawal symptoms, and it is now acknowledged by the UK government as a public health issue.

One of the main reasons this issue took decades to recognise after the release of modern antidepressants onto the market is because medical guidelines, such as those produced by Nice (England’s National Institute for Health and Care Excellence), had for many years declared withdrawal effects to be “brief and mild”.

This description was based on studies run by drug companies, where people had only taken the medication for eight to 12 weeks. As a result, when patients later showed up with severe, long-lasting symptoms, many doctors didn’t take them seriously because these experiences contradicted what the guidelines led them to expect.

Our recent research helps explain this mismatch. We found a clear link between how long someone takes antidepressants and how likely they are to experience withdrawal symptoms – and how severe these symptoms are.

We surveyed NHS patients and found that people who had used antidepressants for more than two years were ten times more likely to have withdrawal effects, five times more likely for those effects to be severe, and 18 times more likely for them to be long lasting compared with those who had taken the drugs for six months or less.

For patients who used antidepressants for less than six months, withdrawal symptoms were mostly mild and brief. Three-quarters reported no or mild symptoms, most of which lasted less than four weeks.

Only one in four of these patients was unable to stop when they wanted to. However, for long-term users (more than two years), two-thirds reported moderate or severe withdrawal effects, with one-quarter reporting severe withdrawal effects. Almost one-third of long-term users reported symptoms that lasted for more than three months. Four-fifths of these patients were unable to stop their antidepressants despite trying.

About 2 million people on antidepressants in England have been taking them for over five years, according to a BBC investigation. And in the US at least 25 million people have taken antidepressants for more than five years. What happens to people in eight-to-12-week studies is a far cry from what happens to millions of people when they stop.

Studying what happens to people after just eight to 12 weeks on antidepressants is like testing car safety by crashing a vehicle into a wall at 5km/h – ignoring the fact that real drivers are out on the roads doing 60km/h.

History repeating itself?

Against this backdrop, a review has just been published in Jama Psychiatry. Several of the senior authors declare payments from drug companies. In what looks like history repeating itself, the review draws on short-term trials – many funded by the pharmaceutical industry – that were similar to those used to shape early treatment guidelines. The authors conclude that antidepressants do not cause significant withdrawal effects.

Their main analysis is based on eleven trials that compared withdrawal symptoms in people who had stopped antidepressants with those who had continued them or stopped taking a placebo. Six of these trials had people on antidepressants for eight weeks, four for 12 weeks and just one for 26 weeks.

They reported a slightly higher number of withdrawal symptoms in people who had stopped antidepressants, which they say does not constitute a “clinically significant” withdrawal syndrome. They also suggest the symptoms could be explained by the “nocebo effect” – where negative expectations cause people to feel worse.

In our view, the results are likely to greatly underestimate the risk of withdrawal for the millions of people on these drugs for years. The review found no relationship between the duration of use of antidepressants and withdrawal symptoms, but there were too few long-term studies to test this association properly.

The review probably underestimates, in our view, short-term withdrawal effects too by assuming that the fact that people experience withdrawal-like symptoms when stopping a placebo or continuing an antidepressant cancels out withdrawal effects from antidepressants. But this is not a valid assumption.

We know that antidepressant withdrawal effects overlap with side-effects and with everyday symptoms, but this does not mean they are the same thing. People stopping a placebo report symptoms such as dizziness and headache, because these are common occurrences. However, as was shown in another recent review, symptoms following discontinuation of a placebo tend to be milder than those experienced when stopping antidepressants, which can be intense enough to require emergency care.

So deducting the rate of symptoms after stopping a placebo or continuing an antidepressant from antidepressant withdrawal symptoms is likely to underestimate the true extent of withdrawal.

The review also doesn’t include several well-designed drug company studies that found high rates of withdrawal symptoms. For example, an American study found that more than 60% of people who stopped antidepressants (after eleven months) experienced withdrawal symptoms.

The authors suggest that depression after stopping antidepressants is probably a return of the original condition, not withdrawal symptoms, because similar rates of depression were seen in people who stopped taking a placebo. But this conclusion is based on limited and unreliable data (that is, relying on participants in studies to report such events without prompting, rather than assessing them systematically) from just five studies.

We hope uncritical reporting of a review based on the sort of short-term studies that led to under-recognition of withdrawal effects in the first place, does not disrupt the growing acceptance of the problem and slow efforts by the health system to help potentially millions of people who may be severely affected.

The authors and publisher of the new review have been approached for comment.

The Conversation

Mark Horowitz is the author of the Maudsley Deprescribing Guidelines which outlines how to safely stop antidepressants, benzodiazepines, gabapentinoids and z-drugs, for which he receives royalties. He is co-applicant on the RELEASE and RELEASE+ trials in Australia funded by the NHMRC and MRFF examining hyperbolic tapering of antidepressants. He is co-founder and consultant to Outro Health, a digital clinic which helps people to safely stop no longer needed antidepressants in the US. He is a member of the Critical Psychiatry Network, an informal group of psychiatrists.

Joanna Moncrieff was a co-applicant on a study of antidepressant discontinuation funded by the UK’s National Institute for Health Research. She is co-applicant on the RELEASE and RELEASE+ trials in Australia funded by the NHMRC and MRFF examining hyperbolic tapering of antidepressants. She receives modest royalties for books about psychiatric drugs. She is co-chair person of the Critical Psychiatry Network, an informal group of psychiatrists.

ref. Antidepressant withdrawal: new review downplays symptoms but misses the mark for long-term use – https://theconversation.com/antidepressant-withdrawal-new-review-downplays-symptoms-but-misses-the-mark-for-long-term-use-260708

Exportation du modèle des « notes de la communauté » de X vers Meta, TikTok et YouTube : ce que ça va changer

Source: The Conversation – in French – By Laurence Grondin-Robillard, Professeure associée à l’École des médias et doctorante en communication, Université du Québec à Montréal (UQAM)

En s’engageant dans le sillage de X, Meta pourrait avoir précarisé la fiabilité de l’information sur ses plateformes. (Shutterstock)

En février 2024, Meta réduisait la découvrabilité du contenu jugé « politique » sur Instagram et Threads afin de limiter l’exposition des utilisateurs à des publications controversées et de favoriser une expérience positive. Moins d’un an plus tard, Mark Zuckerberg annonçait plutôt l’inverse : la fin du programme de « vérification des faits », remplacé par les « notes de la communauté » comme sur X (anciennement Twitter) ainsi qu’un assouplissement du côté des politiques de modération.

Meta souhaitait « restaurer la liberté d’expression » sur ses plates-formes.

Les notes de la communauté sont un système de modération dit « participatif » permettant aux utilisateurs d’ajouter des annotations pour corriger ou contextualiser des publications. D’un média socionumérique à l’autre, les conditions pour devenir un contributeur de cette communauté varient peu : être majeur, actif sur la plate-forme depuis un certain temps et n’avoir jamais enfreint ses règles.

Sans tambour ni trompette, même YouTube et TikTok essayent désormais ce type de modération aux États-Unis. Dévoilé comme une réponse innovante aux défis posés par la circulation de fausses nouvelles, ce modèle mise sur l’autonomisation des utilisateurs pour arbitrer la qualité de l’information. Pourtant, cette tendance révèle un mouvement plus large : le désengagement progressif des médias socionumériques face à la vérification des faits et au journalisme.

D’ailleurs, que sait-on vraiment des notes de la communauté ?

Professeure associée et doctorante en communication à l’Université du Québec à Montréal, je m’intéresse aux transformations qui redéfinissent nos rapports aux technologies et à l’information, tout en reconfigurant les modes de gouvernance des médias socionumériques.

La modération communautaire : ce que dit la recherche

Les notes de la communauté demeurent une fonctionnalité très récente. Connues sous le nom initial de Birdwatch sur Twitter, elles sont déployées à la suite de l’assaut du Capitole en janvier 2021 avec un premier groupe de 1000 contributeurs aux États-Unis. L’accès est progressivement élargi à un échantillon atteignant environ 10 000 participants en mars 2022.

Après le rachat de Twitter par Elon Musk la même année et les licenciements massifs qui en ont suivi, notamment dans les équipes de modération, ce système devient primordial dans la stratégie de modération décentralisée de la plate-forme.

La littérature scientifique traitant de la question est limités, non seulement parce que le modèle est récent, mais également parce que la plate-forme X est son unique objet d’étude. Cependant, elle met en lumière des éléments intéressants sur ce type de modération.

D’abord, les notes de la communauté contribueraient à freiner la circulation de la mésinformation, réduisant jusqu’à 62 % les repartages. Elles augmenteraient également de 103,4 % les probabilités que les utilisateurs suppriment le contenu ciblé en plus de diminuer son engagement global.

Toutefois, il importe de distinguer mésinformation et désinformation. Les études se concentrent sur la première, car l’intention malveillante propre à la désinformation est difficile à démontrer méthodologiquement. Celle-ci est même absente des catégories imposées aux noteurs par X, qui doivent classifier les contenus comme misinformed (mésinformé), potentially misleading (potentiellement trompeur) et not misleading (non trompeur). Ce cadrage restreint contribue à invisibiliser un phénomène pourtant central dans les dynamiques de manipulation de l’information.




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Ensuite, les utilisateurs jugeraient les notes de la communauté plus crédibles que les simples étiquettes de fausses nouvelles ou de désinformation, car elles fournissent un contexte explicatif. De plus, les contributeurs se concentreraient davantage sur les publications de comptes influents, ce qui pourrait limiter la portée de la mésinformation.

Enfin, la recherche souligne la complémentarité entre vérification des faits et notes de la communauté. Ces dernières s’appuient fréquemment sur des sources professionnelles, particulièrement pour les contenus complexes, et prolongent le travail amorcé par les professionnels.

Les vérificateurs et journalistes assurent rigueur, rapidité, fiabilité, tandis que les notes, plus lentes à se diffuser, bénéficient d’un capital de confiance sur une plate-forme où journalisme et médias d’information sont souvent contestés. Leur rôle conjoint s’impose donc comme une évidence, contrairement aux idées prônées par Musk et Zuckerberg.

L’illusion d’une communauté au service de la rentabilité

Les bénéfices tirés de l’adoption de ce modèle par les géants du Web sont loin d’être négligeables : non seulement on mise sur les utilisateurs eux-mêmes pour contrer la « désinformation », mais on stimule en même temps leur activité et leur engagement au sein de la plate-forme.

Or, plus les usagers y passent du temps, plus leur attention devient monétisable pour les annonceurs, et donc profitable pour ces médias socionumériques. Ce modèle permet en outre de réaliser des économies substantielles en réduisant les besoins en personnel de modération et en limitant les investissements dans des programmes de vérifications des faits.

Malgré son apparente ouverture, ce système, comme déployé sur X, n’est pas réellement « communautaire » au sens où peut l’être un projet comme Wikipédia. Il ne repose ni sur la transparence des contributions ni sur un processus collaboratif et un but commun.

En réalité, il s’agit davantage d’un système algorithmique de tri, soit un filtre sélectif fondé sur des critères de visibilité optimisés pour préserver un équilibre perçu entre opinions divergentes. Bien que les notes soient factuelles, elles ne sont rendues visibles qu’à condition de franchir une série d’étapes comme celle de l’algorithme dit de « pontage » (bridging algorithm), qui n’affiche une note à l’ensemble des utilisateurs que si elle est approuvée à la fois par des utilisateurs aux opinions opposées.

En pratique, cette exigence freine considérablement la capacité du système à faire émerger les corrections mêmes pertinentes. Selon une analyse de Poynter, moins de 10 % des notes proposées sur X deviennent visibles. Ce taux aurait d’ailleurs chuté après une modification de l’algorithme en février dernier, une semaine après qu’Elon Musk s’est plaint d’une note réfutant de la désinformation anti-ukrainienne.

De plus, il n’existe aucune mesure concernant l’exactitude ou la qualité des notes. Leur visibilité dépend uniquement de leur perception comme « utile » par des utilisateurs issus de courants idéologiques variés. Or, ce n’est pas parce qu’un consensus se forme autour d’une note qu’elle reflète nécessairement un fait.

L’information de qualité n’est pas la priorité

Les rhétoriques de « liberté d’expression » portées par ceux qui contrôlent les canaux de diffusion sur les médias socionumériques relèvent au mieux du contresens, au pire de l’hypocrisie. Les géants du Web, par le biais d’algorithmes opaques, décident de la visibilité et de la portée des notes de la communauté.

Ces mécanismes et discours alimentent l’érosion de la confiance envers le journalisme et la vérification des faits, car sur ces médias socionumériques, la qualité de l’information importe moins que sa capacité à générer de l’attention et à circuler. Le cas de Meta au Canada en est révélateur. En bloquant l’accès aux médias d’information en réponse à la Loi C-18, l’entreprise a démontré qu’elle pouvait agir presque impunément. Même en période électorale, les investissements publicitaires ont afflué, y compris de la part des mêmes partis et élus qui avaient pourtant dénoncé ledit blocage.




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Face à cette réalité, la lutte à la « désinformation » est un combat noble, mais inégal, contre un ennemi insaisissable, alimenté par la mécanique impitoyable des algorithmes et de l’idéologie d’une broligarchie bien ancrée.

Comme le notaient déjà en 2017 les professeurs et économistes américains Hunt Allcott et Matthew Gentzkow, les fausses nouvelles prospèrent parce qu’elles sont moins coûteuses à produire que les vraies, plus virales et davantage gratifiantes pour certains publics. Tant que les plates-formes continueront de privilégier la circulation de contenu au détriment de la qualité, la bataille contre la « désinformation » restera profondément déséquilibrée quelle que soit la stratégie.

Repenser la liberté d’expression à l’ère des algorithmes

Si l’exportation des notes de la communauté au-delà des frontières américaines se confirme, elle représentera un progrès uniquement pour les propriétaires de ces plates-formes. Le modèle se présente comme ouvert, mais il repose sur une délégation contrôlée, balisée par des algorithmes qui filtrent toujours ce qui mérite d’être vu.

Ce n’est pas la communauté qui décide : c’est le système qui choisit ce qu’elle est censée penser.

En cédant une partie du travail journalistique à ces dispositifs opaques, nous avons affaibli ce qui garantit la qualité de l’information : exactitude, rigueur, impartialité, etc. Loin d’une démocratisation, c’est une dépolitisation de la modération qui s’opère où tout devient question de rentabilité, même les faits.

Elon Musk affirme « Vous êtes les médias maintenant ». La question à se poser désormais est la suivante : avons-nous vraiment une voix libre, ou sommes-nous de simples variables formatées dans un algorithme ?

La Conversation Canada

Laurence Grondin-Robillard ne travaille pas, ne conseille pas, ne possède pas de parts, ne reçoit pas de fonds d’une organisation qui pourrait tirer profit de cet article, et n’a déclaré aucune autre affiliation que son organisme de recherche.

ref. Exportation du modèle des « notes de la communauté » de X vers Meta, TikTok et YouTube : ce que ça va changer – https://theconversation.com/exportation-du-modele-des-notes-de-la-communaute-de-x-vers-meta-tiktok-et-youtube-ce-que-ca-va-changer-255680