Science

the science behind a geological risk that repeats itself every 1,200 years

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Although the tsunamis seem like effects that are reserved for the Japanese coasts, the reality is that Spain He also has many ballots to suffer an event of this magnitude on our coasts. Cádiz is one of the locations with the highest risk of suffering a tsunami in Spain, and the authorities wanted to verify that the emergency and response systems they work in case this type of event occurs at any time. In order to verify this, the authorities carried out a drill in mid-November in which the ES-Alert systemseveral schools and all emergency services. And given this great display, the question is mandatory: what are the chances of a tsunami occurring in Cádiz? Cádiz is at the center of this simulation because it is the area with the greatest danger from tsunamis in the country, due to the history behind it and the seismicity of the Azores-Gibraltar area. For this reason, the Junta de Andalucía has prepared a Emergency Plan for the Risk of Tsunami (PEMA) and has chosen Cádiz for the largest tsunami simulation carried out in Spain. Because. In the past, geological records indicate that at least five large tsunamis have occurred in the Gulf of Cádiz in the last 7,000 years. All of these associated with megaearthquakes at the plate boundary between Africa and Eurasia. Added to this is the historical reference: the tsunami linked to the Lisbon earthquake of November 1, 1755which completely flooded Cádiz and part of the Andalusian coast with waves of several meters in a matter of dozens of minutes. The paleoseismology works of the CSIC and several universities place the recurrence interval of these events between 1,200 and 1,500 yearslong enough to be socially forgotten, but too short to be ignored in risk planning. This places the southwest of the peninsula as one of the most exposed areas in Europe to tsunamis, despite the fact that the “perceived risk” on the street has historically been very low. And this is precisely something that has been analyzed in the layers of sand and marine remains left inland and that gives us information about what happened thousands of years ago. Although logically always with a time frame that is approximate. Why now. The fact of doing the simulation in this month of November may make us think that scientists have found evidence that a large tsunami is coming to Cádiz, but nothing could be further from the truth. What is happening in this case is that a risk that has been known for a long time and for which, until now, hardly anything had been tested on a large scale, is being taken more seriously. That is why this scientific evidence that tells us about the real risk that exists in this case on the coast of Cádiz has been transferred to the regulations. In 2015, the Basic Planning Guideline for Civil Protection against the Risk of Tsunamiwhich recognizes the Gulf of Cádiz as a critical area where the expected wave height exceeds 0.5 meters. A framework that is not limited to pretty maps, but defines decision guidelines according to magnitude and location of earthquakes, chains of command, warning protocols and response time objectives, with the National Geographic Institute, AEMET and the future SINAM network as input sensors. What has been simulated. In this case, Cádiz has simulated an earthquake with an approximate magnitude of 7.5-7.6 to the southwest of Cape San Vicente, very similar to the one in Lisbon in 1755 and which generates a tsunami that points directly to the western Andalusian coast. In this scenario, the propagation models estimate between 45 and 60 minutes from the activation of the alert until the arrival of the first wave from Cádiz, which in practice is the clock with which Civil Protection works. The objective of the exercise was to virtually save as many people as possible in that one-hour window: horizontal evacuation to non-flood areas, vertical evacuation to high floors, beach and port rescues, protection of cultural assets and management of damaged buildings were tested. On paper, all this already existed in manuals and maps; What was missing was to see how a real city behaves when a tsunami warning sounds in the middle of a work morning.​ Images | Matt Paul Catalano In Xataka | There are scientists deliberately causing earthquakes in the Alps and they have a good reason for it

There are exactly five things that you 100% haven’t dreamed of. And science already knows why

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He dream world It has its own rules. It is a place where the impossible seems to be the routine, but, paradoxically, some of the most mundane tasks in our lives become impossible to appear in our dreams. And this is something that can cause us many questions about why we have not dreamed of some specific things. The examples. We warn you that this is something that can break your head, because the question is obligatory: have you ever tried to read a text in a dream? (if you remember) o Have you taken out your phone to discover an incomprehensible interface? All this is not a coincidence, because in reality there are some things that we can never dream like we all expected (even if they are very real dreams). It has an explanation. science has several reasons in his lap to convince us why elements of modern life such as the smartphone or computer interfaces have little place in our dreams. Everything focuses on the fact that during the REM sleep phase the activity in the prefrontal networks of the brain are greatly reduced. And it is precisely here where executive control and language are ‘stored’. In this way, if during sleep these neurons are ‘asleep’, then we will not be able to read a text correctly or even hold a smartphone in our hands. When we sleep, it seems that we don’t want to work or be using our cell phone. This is because in this time range the activity of the limbic area, related to the emotional and visual part, is triggered. This results in the content of dreams leaning towards the associative, visual and emotional, rather than tasks that require a great analytical focus such as operating a complex interface. In this way, the material of our waking life is not literally copied from dreams, but rather is integrated in a selective and transformed way, prioritizing emotional charge over functional fidelity. The nightmare of reading. The same neurocognitive principle that we have seen is the one that explains another of the best-known phenomena: the inability to read texts stably. What is basically caused is that the characters literally ‘move’ or distort because the language networks are not being stimulated as much. This applies equally to numbers, mathematical calculations, or the simple task of looking at the time on a digital clock. Stimuli that require fine symbolic precision tend to become illegible or change constantly. Although some studies with lucid dreamers have shown that basic operations can be performed under experimental conditions, outside the laboratory, the stability of the symbols is almost non-existent. No smell or taste. While sight and hearing dominate the dreamscape, other sensory modalities are virtually absent. Systematic studies based on sleep diaries are consistent in showing that olfactory and gustatory experiences are extremely rare. Figures put its occurrence at approximately 1% of all dream reports. Even in laboratory experiments where the olfactory environment is manipulated during the night, most participants do not report smelling anything in their dreams, reinforcing the idea that chemical senses are a rarity in this state. The mirror. It is another quite common phenomenon in dreams: seeing yourself reflected in the mirror is something almost impossible to achieve. In dreams, this is generated predominantly “top-down”, that is, from the brain networks themselves and with very little or no sensory information from the outside. Because of this, high-resolution details, such as a reflected face, text, or an interface, tend to morph or distort as soon as we try to examine them closely. Visual stability is not the norm. The ancestral content. In stark contrast to the absence of cell phones or books, there is one type of content that seems to be overrepresented: threats. Dreaming about being chased, falling, facing dangers or even elements such as storms or snakes is extremely common. And on many occasions we remember it perfectly because we have precisely woken up at the moment sweating or with our heart pounding. This supports the known “Threat Simulation Hypothesis” (TST), proposed by philosopher Antti Revonsuo. This theory suggests that dreams could have an evolutionary function: serving as virtual “training” to rehearse how to respond to danger in real life. However, the scientific literature itself indicates that this hypothesis, although plausible and supported, is also the subject of debate and presents mixed results when compared between different cultures and environments. Images | Shane In Xataka | Years ago we discovered that our ancestors’ dreams were not like ours. There are now thousands of people trying to introduce biphasic sleep into their lives.

science has a different opinion

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For a person with celiac diseasesocial life can be a real minefield. Cross contamination is a dangerous enemy that is present in the way food is prepared, but also in the kisses we have with other people. In this way, the question is obligatory: if my partner has eaten bread, pizza or pasta… Is it dangerous for us to kiss if I am celiac? To answer, luckily we have science on our side. Until now, people who have to stay away from gluten for serious medical reasons could be afraid to kiss if their partner had not rinsed their mouth or brushed their teeth before. But science is pretty transparent. in the preliminary study presented at Digestive Disease Week 2025. Their conclusion is quite clear: some gluten can be passed through a kiss between two people, but the amount is so small that it is very unlikely to have relevant clinical consequences. The study. To reach this conclusion, 20 non-celiac people who ate a food with a large amount of gluten were recruited. Immediately afterwards, they had to kiss their celiac partners, allowing the researchers to measure the concentration of gluten in the saliva that had passed from one boba to another. The results were quite clear: in 18 of the 20 couples, the levels in the recipient’s saliva were below the international “safe” threshold, which is 20 mg, and furthermore, none reported symptoms related to intolerance. Although if you drink a little water before kissing, this risk decreases even more. Why 20 mg. This threshold value is not something random, but rather it turns out to be defined by science itself. Here one of the reference studies comes into play, Catassi’s essay and collaborators published in American Journal of Clinical Nutritionwhich administered 10 or 50 mg of gluten daily to adults with treated celiac disease for 90 days. What was seen is that the daily exposure was clearly below that 10 mg range for the majority of patients. A later review in Alimentary Pharmacology & Therapeutics reached similar conclusions: the doses that are beginning to be worrying move in the order of tens of milligrams per day, especially if they are maintained over time, not in single isolated traces. In this way, an isolated kiss has the same concentration of gluten as foods that are categorized as safe. How is it possible that a kiss after eating a large amount of gluten-containing foods is not dangerous? This is the question we ask ourselves after reading these conclusions, and it has an answer, but in studies done on peanutsanother allergen. In this case it was seen that just after eating, the concentration of allergen in the mouth is really high. But after simple measures such as waiting a few minutes, drinking water or brushing your teeth, levels drop drastically. In this way, a kiss does not transfer food, but rather a fraction of a milliliter of saliva. And that saliva, minutes after eating, has already “cleaned” most of the protein that was inside. And this is valid for all allergies that are mediated by immunoglobulin E (which is responsible for generating the allergic response). There is a margin of safety. On a daily basis, people who are intolerable to gluten and who follow a very strict diet to avoid contamination, the truth is that they consume this allergen. Although in a very small quantity. This shows it a study who developed techniques to measure gluten immunogenic peptides (GIP) in urine and feces. The work showed that many people with celiac disease who follow a strict diet have small accidental exposures on a regular basis, the result of cross-contamination in modern life. However, the majority do not show clinical worsening or intestinal damage if these exposures are spontaneous and at very low doses. A kiss, in the worst case scenario, is exactly that: an isolated microdose exposure. The final verdict. What this new study provides is not a revolution, but a reassuring quantification of something that the consensus of experts already sensed. Even the main patient associations, such as the Celiac Disease Foundation or Coeliac UK, have been with a practical message for some time: the risk of kissing is low. The only common sense recommendation, which is still valid, is to avoid kissing right at the moment when the other person is eating gluten or has obvious remains of food in their mouth. You always have to wait a little for the saliva to take effect, but it doesn’t have to be a problem beyond this. Images | Cassie Lopez Wesual Click In Xataka | The difference between celiac disease and gluten intolerance can be difficult to appreciate. But there is a key detail that makes them very different.

how much science believes our longevity will actually increase

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Society is increasingly obsessed with living longer and longer and have an aesthetic that corresponds to a younger age. Right now there are many really eloquent projects to achieve practically immortalitybut this makes us wonder if our body has some kind of limit that cannot be exceeded. This is what science tries to elucidate. Nowadays, people who live more than one hundred years are something extraordinary, and we even see their centenary birthdays appear on the pages of the newspaper or on local television programs. But the question in this case is whether the new normal will be being able to live more than a century as something normal, and above all in good conditions. But the truth is that we are far from achieving this. Two concepts. The first thing to understand here is the difference that exists between the average life expectancy and maximum longevity. The first of these is growing spectacularly in the last century thanks to vaccines, hygiene, medications and better access to healthcare (although this reaches an older population, with its problems). But when we talk about maximum longevity we cannot say the same, since it is a much harder ceiling to crack. The obligatory question in this case is clear: where is our ceiling that we cannot break? Less than expected. There is now solid scientific evidence that suggests that human beings have a “factory” biological limit. Different studies, such as those published in Nature, they placed the natural human limit around 115 years. Although more recent and optimistic reviews, based on statistical modeling of the “supercentenarians” (people over 110 years old), extend that range up to 125 years. Therefore, we are not facing a scenario of immortality, but rather the age progression curve begins to stabilize at a specific point. And this is clearly a brake that biology itself is imposing on us, because our body has a very clear limit in its functioning. Prioritize well-being. Reaching the age of 120, but with very poor health, with many illnesses behind you or without being able to move, is not something at all attractive. That is why demographic projections for Europe They suggest that, by the year 2065, life expectancy will be between 87 and 93 years. This doesn’t sound like science fiction, and that’s precisely why it’s relevant. It is not about making quantum leaps through unproven gene therapies, but about the accumulation of medical and social improvements. The goal of modern longevity medicine is not for you to live 150 years connected to a machine, but to extend the “healthspan“, that is, the period of healthy life. We already know the ‘secret’. While we wait for drugs that reverse old age, science tells us that we already have the “technology” to maximize our lives and it has been used for decades in the so-called ‘Blue Zones’ of Okinawa as a standard. And it is precisely in this area that people It is capable of easily reaching 100 years without much problemand the question was obligatory: why here? We found the answer in studies carried out in this areait can be seen that the factors that influence being able to reach 100 years of life have nothing to do with transfusions of young plasma, blood cleansing or super-expensive therapies that promise miraculous results. Among the habits that follow we can find the following: Natural calorie restriction: They consume 10-15% fewer calories than an average Western adult. And we already know that this influences above all the generation of oxidative stress which is a great ‘poison’ for our body. The good carbohydrate diet: their diet is based on vegetables and complex carbohydrates such as sweet potatoes, with a very low animal protein intake. Youth biomarkers: the combination of diet and constant physical activity results in a lower incidence of chronic diseases. Less stress: another great poison for the body due to its involvement in cortisol levels. In Okinawa, community cohesion acts as a buffer for stress. The importance of habits. In this way, the scientific horizon for the next century does not promise immortality. It is likely that we will continue to see a trickle of individual records and exceptional cases of genetics that cause us to see people who far exceed the century of life. But for most humans, This is not something we get. (or at least with a good quality of life). The true longevity revolution in the 21st century will be to make reaching age 90 the norm and not the exception, applying what we already know works: moving, eating less (and better) and maintaining strong social ties. And above all, do not wait for a magic pill, as has been demonstrated by the habits of Japanese people who have achieved an effect that no gene therapy has achieved so far. Images | Ravi Patel In Xataka | Not all brain cells age at the same time: we have found a “hot spot” of aging

The extinction of Neanderthals has always been a mystery. Science now believes that they are still with us

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For decades, the disappearance of Neanderthals has been one of the biggest mysteries of human evolution. It happened about 40,000 years ago, suspiciously coincident with our species Homo sapiens to Eurasia… But now we are thinking that they did not become extinct. What was thought. Classical theories paint a replacement scenario: either we wiped them out in direct competition, or they couldn’t withstand brutal climate change. But now a study published in Scientific Reports offers a much more fascinating answer: we absorb them among ourselves. And the key to all this is genetic dilution. The hypotheses. To go deeper, the competition hypothesis suggests that Homo sapiens We were simply superior: we had better hunting strategies, a broader diet or more advanced social structures that allowed us to monopolize all the resources, driving the Neanderthals to extinction. On the other hand, the environmental hypothesis blames the drastic climate changes that occurred just at that time. According to this idea, Neanderthals could not adapt to extreme fluctuations and their populations fragmented until they disappeared permanently. However, the new study presents a mathematical model that leaves both factors aside and focuses on the most basic of all: demographics and sex. The new model. The authors of the study propose an analytical model that demonstrates how Neanderthals could disappear without the need for the Homo sapiens had any selective advantage over them. The model does not require “catastrophic events” or cognitive superiority. Instead, it relies on a concept called “species-neutral drift” and a key factor: small, recurring immigrations of Homo sapiens in Neanderthal territories. There were many more of us. One of the first ideas pointed out in this case is that the population Homo sapiens that left Africa was much larger in number than the Neanderthal, acting as a “practically infinite demographic reservoir.” By going together, because friction makes affection, and between the species they began to intersect and had very fertile offspring. The model assumes that this was not a one-time event, but rather a “sustained gene flow” that occurred every time a small group of modern humans arrived in an area. So, adding that the Neanderthal population was much smaller and there was a constant influx of genes from Homo sapiensthe result is the dissolution of the gene pool. It’s literally like pouring a glass of Neanderthal water into an ocean of Homo sapiens. In the end his presence is completely diluted. The time. The most powerful thing about the study is that its calculations fit with the archaeological record. The mathematical model shows that this process of “almost complete genetic replacement” could have occurred within a period of 10,000 to 30,000 years, something that aligns with the long period of coexistence that both species had in Eurasia. Were they extinct? This is the question we ask ourselves. Know if the word ‘extinction’ is appropriate for this paradigm. This model offers what scientists call a “parsimonious explanation” (the simplest). In words we understand, it does not deny that other factors, such as competition or weather, could have contributed. But it shows that this genetic dissolution alone is something that may have explained the disappearance of the Neanderthals. That is why, rather than an extinction, we speak of a fusion by absorption. This perfectly explains why the Neanderthals disappeared as a genetically distinct group, but their legacy endures: modern humans of Eurasian ancestry conserve in our DNA a small percentage of their genetic heritage (although very diluted). Images | mostafa meraji In Xataka | Human evolution has not stopped: in fact, there are reasons to think that it is more accelerated than ever

Years ago, microbiota transplants seemed like something out of science fiction. Today they are already curing diseases

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Sometimes extreme situations require extreme measures, at least in the field of medicine and health. Perhaps to many, the idea of microbiota transplants It seems to them that it belongs to this range of extreme measures. Perhaps more so if we refer to this therapy by its first and last name, because we are talking about fecal microbiota transplants. Let’s start at the beginning, explaining what exactly these transplants are. Although its name is quite descriptive. The central idea of ​​this treatment is to take a sample of intestinal microbiota from a healthy person and transfer it to the patient’s intestine. For this, samples of fecal matter are used, feces from the donor that are treated for introduction into the recipient’s gastrointestinal system. The process begins, therefore, by taking a sample (or several) of the donor feces. First of all, it must be verified that these feces do not contain pathogens but that the “good bacteria” of our digestive system predominate in the sample. Once this filter has been passed, the sample is prepared in different ways depending on how it will be administered. One possibility is to dry, freeze and encapsulate part of these samples to administer them. through a pill. However, the most conventional options involve diluting the sample in saline water and then filter it and enter it into our system gastrointestinal, either through a tube introduced through the mouth or nose and that would reach our stomach; either through a colonoscopy, an endoscopy through the colon. Fixing the imbalance And all this, for what? Interestingly, if we are transplanting microbes from one person to another, the reason is to fight against a pathogenic bacteria, called Clostridioides difficile (C. diff). This is a bacteria that normally inhabits our system gastrointestinal without causing major discomfort. But not always. In these cases, C. diff It can take over the inside of our intestine, wreaking havoc on it. C. diff They feed on toxic compounds that they metabolize from some foods we consume and that can end up causing even more damage to our microbiota. This infection It is considered the main cause of diarrhea associated with medical treatments, but this It’s not your only symptom.These include fever, pain or tenderness in the stomach, loss of appetite and nausea, symptoms of gastroenteritis. Some more serious cases They can lead to dehydration, blood or pus in the stool, and kidney failure. One of the problems associated with this bacteria is the appearance of recurrent infections: many patients become ill again between two and eight weeks after the original infection. The potential of this tool is yet to be explored. A recent study, for example, explored the possibility of using this type of intervention to improve sports performance. A luck of “fecal doping” similar in some ways to existing techniques. Sport, and especially elite sport, can affect our microbiome, which in turn can be exploited in favor of the athletes themselves. These transplants have even been proposed in veterinary. Specifically, to help preserve koalas, as we saw in a studio also presented in 2019 in the magazine Animal Microbiome. Over the last few years we have been discovering new links between our gut microbiome and seemingly very distant aspects of our health. Now we even know that there is a connection between our brain and this one. Unfortunately, we still do not understand the causal relationships operating in this connection. In this sense, recently we came across a link between these transplants and autism. a study published in 2019 in the magazine Scientific Reports observed that symptoms linked to autism were reduced among those who had received this type of transplants. In Xataka | 50% of the population is infected with H. pylori. We are finally eradicating it and that has unexpected consequences Image | shameersrk / chriskeller

science has discovered why

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Sleeping little is still one of the great silent evils of modern life. Long workdays, screens on until dawn, and the glorification of eternal productivity have normalized something that science has been warning about for decades: subtracting hours of sleep is not freeand can even be likened to going through life drunk. The psychologist specialized in sleep Nuria Roure summed it up on the podcast from ‘Mommy, what are you saying’: “People who have spent more than 20 hours awake have a level of attention similar to that of someone who has consumed about six beers”. It may seem like an exaggeration, but science backs up his claim. Like he was drunk. If you have slept very few hours, surely when you get out of bed the first steps you take hardly follow a straight line, but rather they may seem quite similar to the house having become a real boat. Something that also happens when we have two too many drinks. And it’s not that during the night you woke up sleepwalking and grabbed a few beers from the fridge, but the fault lies in your sleep hygiene. A study from the University of South Australia published in Occupational and Environmental Medicine compared the effects of lack of sleep with those of alcohol. After 17 to 19 hours without sleep, the participants showed cognitive and motor impairment equivalent to a blood alcohol level of 0.05%. That is, the tired brain and the drunk brain process information with comparable slowness and clumsiness. And this is something that also justifies that Driving without sleep is as dangerous as being a little drunk. Although it is not the only evidence we have, since a great study has confirmed that even partial sleep deprivation, which consists of sleeping four or five hours for several consecutive days, affects attention and decision making. You can also get sick. Although we focus on the effects on our brain, the reality is that it goes much further. A study published in the journal Sleep concluded that sleeping less than six hours a night was associated with an increased risk of hypertension, type 2 diabetes, or obesity. But we must not forget about Alzheimer’s. It must be remembered that during sleep, the brain activates its ‘cleaning’ systems to eliminate the garbage produced by neurons, including beta-amyloid that is implicated in Alzheimer’s. In the magazine itself Nature we can find solid evidence which warns that people who consistently slept less than six hours a night in middle age were more likely to develop dementia. Adolescents at the center of the problem. Sleep deficit begins every time before. According to the Spanish Sleep Society, Spanish adolescents sleep on average between six and six and a half hours a day, when their brain needs between eight and ten. One of the culprits in this case for science is the educational system, as pointed out by the American neurologist Mary Carskdon who has been pointing because having to get up early to go to class is a key factor in chronic fatigue syndromes among youth. Images | Shane BENCE BOROS In Xataka | Modern life is destroying the dream. Science explains how to fight back using your greatest ally: light

We sensed that arguing in front of small children was a bad idea. Science has revealed to what extent

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Arguing in front of a small child is something that classically always has been discouraged for the problems that it can cause for the minor himself. And this is something that is not nonsense, because a child seeing this scene does not think that he is witnessing the conflict between two adults, but rather he thinks that it is his fault. And it is not an exaggeration that has always been done, but developmental psychology and neuroscience have been explaining for decades why something as human as this happens. Self-blame. The minds of little ones function very differently from those of adults, and it is logical because they are developing over time. And this is something that was already defined by Jean Piaget, who attributed he “egocentric thinking“to children who are in their first years of life. In it, children interpret the world through their own perspective, and psychologists Wesley Rholes and John Finchman they showed it in the nineties when seeing that minors tend to take responsibility for conflicts family members, especially when they do not understand the causes or why. This causes minors to interpret the situation in a very emotional way without thinking about the reasons why it is causing this (which could be friction between two adults). And it is logical, because at an early age the mind is not yet learning to distinguish between what is internal and what is external. The impact. When these discussions are intense or frequent, children may develop anxiety, stress or guilt. It is something that is proven also by Edward Cummings and Patrick Davies, from the University of Notre Dame, who pointed out that unresolved conflicts between parents affect children’s ability to regulate their emotions and maintain a sense of security. Other studies reinforce this idea, showing that family tension can increase a child’s risk of have emotional problems with the passing of the years. The solution. So… Shouldn’t we argue in front of minors? This may become impossible in some situations, especially when living together. That is why the secret is not in avoiding them, but in how adults manage them and explain it later. This is something where psychologists agree when they point out that the strategy should be for the parents to clarify that the dispute has nothing to do with the child, to help neutralize feelings of guilt and strengthen the emotional bond with them. What the brain says. From neuroscience, we know that when a person (whether adult or child) is angry, the brain strongly activates the amygdala, which is the center where emotions are processed in the brain. Although logically we have a brake which is the prefrontal cortex as it has the activity of reducing this activity. Based on this, science suggests that in moments of intense anger, one cannot ask for calm because physically there are no neural resources that can calm someone down. Therefore, parental calm acts as a brain “anchor.” Its serenity not only calms, but also offers the child a model of self-regulation that his own brain cannot yet achieve alone because it does not have this brake. The link. Ultimately, understanding emotions—your own and those of others—is a shared learning process. Children don’t need arguments to go away, but rather to understand that these tensions do not threaten their safety or self-worth. This understanding does not arise by instinct: it is cultivated with words, presence and emotional coherence. And science backs it up. From Piaget to modern neuroimaging, everything indicates that the true antidote to childhood guilt is not adult perfection, but the opportunity to teach, with each conflict, that love and disagreement can coexist without breaking the bond. Images | Vitaly Gariev Marcus Neto In Xataka | If the question is where to find the time to play sports or learn languages, you have the answer on your mobile

More and more children suffer from it and science believes it knows why

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For years, the hypertension has earned the nickname the “silent killer“. It is a pathology that barely causes symptoms, but can cause serious damage in the heart, brain and blood vessels. Traditionally, it has been associated with older people, whose arteries age and accumulate atheromatous plaques over time. But that is changing: More and more children are living with high blood pressure. Taking blood pressure in the little ones in the house is something that for many may be unthinkable, because it is something that is logically assumed to be perfect because their arteries are also very young. But it’s changing, according to a study published in The Lancet Child & Adolescent Health. How many. The data are worrying: the percentage of children and adolescents with hypertension has almost doubled in two decades: from 3.2% in 2000 to more than 6.2% in 2020. This means that 114 million children under 19 years of age in the world today live with high blood pressure. This photograph results from an analysis of 96 different studies and 443,000 young people from 21 countries. The reasons. So… Why on earth does a child have a disease that is associated with older people? The person responsible is in obesity which is associated with an almost eight-fold increased risk of developing high blood pressure compared to their peers with a healthy weight. And the figures in this case are devastating. To give us an idea, among children who have a healthy weight, only 2.4% have hypertension. But this counteracts with children who do have obesity, where the figure shoots up to 19%. This is further amplified when childhood obesity is increasing globally and has tripled since 2000 as has recognized UNICEF. And the causes in this case seem to be in the high consumption of processed foods and also in the low physical activity that some young people have. Diagnose in time. Although the study recognizes the limitations that arise in the differences in measuring blood pressure, the message is quite clear: blood pressure must be taken when risk factors such as obesity are present. We must remember that we are talking about a ‘silent killer’, because it seems that everything is correct, but damage to the arteries is occurring. The most important thing, like any other disease, always is early diagnosis to be able to apply measures to control the situation and prevent it from advancing much further. The problem of measurement. One of the most revealing findings of the study is that How we measure blood pressure matters, a lot. Prevalence figures change drastically depending on the diagnostic method. A priori, the diagnosis in a medical consultation requires at least three office visits for hypertension to be confirmed, causing the prevalence to be estimated at 4.3%. However, when the researchers included out-of-office evaluations (like the classic blood pressure monitors that anyone can use), the prevalence of sustained hypertension shot up to 6.7%. It’s a problem. This paradigm shift suggests that there are children who have normal tension when they go to the doctor, but it increases in their daily lives. Something alarming, especially considering that it affects 9.2% of children and adolescents globally and that is why we should not allow this masked hypertension. In the opposite case, blood pressure is elevated in the medical environment due to stress, but is normal at home, something known as ‘white coat hypertension‘. This affects 5.2% of young people, suggesting that a notable proportion could be being misdiagnosed or overtreated. Prehypertension. The study not only looks at children who are already hypertensive, but also at those who are in the waiting room. Data show that an additional 8.2% of children and adolescents have prehypertension, that is, blood pressure levels higher than normal, but do not yet meet the criteria for diagnosis. But this risk is not homogeneous. Prehypertension is especially prevalent during adolescence, reaching 11.8% of adolescentscompared to 7% in younger children. Images | CDC Ben Wicks In Xataka | We have known for a long time that our heart “fixes” itself. Now we know better how

That a teenager begins to ‘hate’ his parents is something that is in his brain, and science has already found the pattern

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If you’re a parent of a teenager, you know: their world revolves around their friends. If you were one of them, you surely remember: parents’ opinion took a backseat. And although it seems that it is a sign of the rebellion that we see normal at this age, the reality is that the guilt is literally found in the brain. The culprit. But when asked what causes this indolence among adolescents? The answer comes from the magnetic resonance imaging that has been applied to the brains of some adolescents. And research shows that, during adolescence, the brain not only changes its interest, but also reconfigures your reward circuits so that the voices of strangers are more gratifying than the voice of one’s own mother. And this is something that explains the fact that adolescents give much more importance to a friend than to their own closest family, and even go so far as to prioritize them above anything else. Although in the end he has a good excuse in his brain systems. The study. To find this out, the researchers didn’t have the teens listen to scolding. They used a more cunning methodology by gathering 46 children and adolescents between 7 and 16 years old who were exposed to listening to recordings of nonsense words such as teebudie-shawlt. The important thing about this investigation was that these meaningless words were spoken by two voices: that of their own mother and that of two women unknown to them. In this way, when the recording was played, the activity of their brains began to be analyzed through functional magnetic resonance imaging (fMRI) to see the parts of the brain that were lighting up with each of the voices that were playing. The results. In the youngest children between seven and twelve years old, their mother’s voice caused a party at the reward centers of the brain, specifically in the nucleus accumbens (NAc) and the ventromedial prefrontal cortex (vmPFC). The interesting thing here is that this activity was much greater than what was felt when hearing the voices of the strangers and it is logical because the mother is the center of her social universe that causes her greater happiness. But things change completely in adolescents between 13 and 16 years old, where these same reward and social evaluation regions showed significantly greater activity for unfamiliar voices than for their own mother’s. In this way, the age that we can consider as a border between them paying attention to their mother and when they are going to completely ignore what they are told will be around 13.5 years. Because. In this case we are not talking about adolescents rejecting their parents, since in a behavioral test they were able to identify mothers’ voices in an almost perfect way. The change is precisely in the valuation of that voice. This neurobiological turn is considered an adaptive process essential for maturity. The teenage brain is being “refreshed” for a new mission: leaving the nest. To prepare for independence, the brain must begin to find new social connections more rewarding. You have to tune in with your companions, future allies and partners. The bibliography. This finding fits with previous models that were made to identify the differentiated stages in social and brain development, where the affective focus passes from the mother to friends and finally to romantic relationships. Recent reviews reaffirm that the reward system in adolescence is especially sensitive to novel social stimuli, and that the maturation of frontostriatal connections modulates these changes. A previous work by the same group had already shown that in childhood the maternal voice has a privileged response in the mesolimbic circuit and the current study extends and completes that model by showing how this pattern is reversed in adolescence. In this way, every time we see a teenager who literally tells his mother that he doesn’t even want to hear her, but spends all day talking to his friends, we already know why: his brain has changed so that he likes it more. Images | Sebastien Mouilleau Amir Hosseini In Xataka | If the question is where to find the time to play sports or learn languages, you have the answer on your mobile

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