Questões de Concursos Inglês

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Can you learn in your sleep?

Sleep is known to be crucial for learning and memory formation. What's more, scientists have even managed to pick out specific memories and consolidate them during sleep. However, the exact mechanisms behind this were unknown — until now.

Those among us who grew up with the popular cartoon "Dexter's Laboratory" might remember the famous episode wherein Dexter's trying to learn French overnight. He creates a device that helps him to learn in his sleep by playing French phrases to him. Of course, since the show is a comedy, Dexter's record gets stuck on the phrase "Omelette du fromage" and the next day he's incapable of saying anything else. This is, of course, a problem that puts him through a series of hilarious situations.

The idea that we can learn in our sleep has captivated the minds of artists and scientists alike; the possibility that one day we could all drastically improve our productivity by learning in our sleep is very appealing. But could such a scenario ever become a reality?

New research seems to suggest so, and scientists in general are moving closer to understanding precisely what goes on in the brain when we sleep and how the restful state affects learning and memory formation.

For instance, previous studies have shown that non-rapid eye movement (non-REM) sleep — or dreamless sleep — is crucial for consolidating memories. It has also been shown that sleep spindles, or sudden spikes in oscillatory brain activity that canbe seen on an electroencephalogram (EEG) during the second stage of non-REM sleep, are key for this memory consolidation. Scientists were also able to specifically target certain memories and reactivate, or strengthen, them by using auditory cues.

However, the mechanism behind such achievements remained mysterious until now. Researchers were also unaware if such mechanisms would help with memorizing new information.

Therefore, a team of researchers set out to investigate. Scott Cairney, from the University of York in the United Kingdom, co-led the research with Bernhard Staresina, who works at the University of Birmingham, also in the U.K. Their findings were published in the journal Current Biology.

Cairney explains the motivation for the research, saying, "We are quite certain that memories are reactivated in the brain during sleep, but we don't know the neural processes that underpin this phenomenon." "Sleep spindles," he continues, "have been linked to the benefits of sleep for memory in previous research, so we wanted to investigate whether these brain waves mediate reactivation. If they support memory reactivation, we further reasoned that it could be possible to decipher memory signals at the time that these spindles took place."

To test their hypotheses, Cairney and his colleagues asked 46 participants "to learn associations between words and pictures of objects or scenes before a nap." Afterward, some of the participants took a 90-minute nap, whereas others stayed awake. To those who napped, "Half of the words were [...] replayed during the nap to trigger the reactivation of the newly learned picture memories," explains Cairney.

"When the participants woke after a good period of sleep," he says, "we presented them again with the words and asked them to recall the object and scene pictures. We found that their memory was better for the pictures that were connected to the words that were presented in sleep, compared to those words that weren't," Cairney reports.

Using an EEG machine, the researchers were also able to see that playing the associated words to reactivate memories triggered sleep spindles in the participants' brains. More specifically, the EEG sleep spindle patterns "told" the researchers whether the participants were processing memories related to objects or memories related to scenes.

"Our data suggest that spindles facilitate processing of relevant memory features during sleep and that this process boosts memory consolidation," says Staresina. "While it has been shown previously," he continues, "that targeted memory reactivation can boost memory consolidation during sleep, we now show that sleep spindles might represent the key underlying mechanism."

Cairney adds, "When you are awake you learn new things, but when you are asleep you refine them, making it easier to retrieve them and apply them correctly when you need them the most. This is important for how we learn but also for how we might help retain healthy brain functions."

Staresina suggests that this newly gained knowledge could lead to effective strategies for boosting memory while sleeping.

So, though learning things from scratch à la "Dexter's Lab" may take a while to become a reality, we can safely say that our brains continue to learn while we sleep, and that researchers just got a lot closer to understanding why this happens.

From: https://www.medicalnewstoday.com/articles/Mar/2018

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EL TIGRE, Venezuela — Thousands of workers are fleeing Venezuela’s state-owned oil company, abandoning once-coveted jobs made worthless by the worst inflation in the world. And now the hemorrhaging is threatening the nation’s chances of overcoming its long economic collapse.

Desperate oil workers and criminals are also stripping the oil company of vital equipment, vehicles, pumps and copper wiring, carrying off whatever they can to make money. The double drain — of people and hardware — is further crippling a company that has been teetering for years yet remains the country’s most important source of income.

The timing could not be worse for Venezuela’s increasingly authoritarian president, Nicolás Maduro, who was re-elected last month in a vote that has been widely condemned by leaders across the hemisphere. Prominent opposition politicians were either barred from competing in the election, imprisoned or in exile.

But while Mr. Maduro has firm control over the country, Venezuela is on its knees economically, buckled by hyperinflation and a history of mismanagement. Widespread hunger, political strife, devastating shortages of medicine and an exodus of well over a million people in recent years have turned this country, once the economic envy of many of its neighbors, into a crisis that is spilling over international borders.

If Mr. Maduro is going to find a way out of the mess, the key will be oil: virtually the only source of hard currency for a nation with the world’s largest estimated petroleum reserves. But each month Venezuela produces less of it. Offices at the state oil company are emptying out, crews in the field are at half strength, pickup trucks are stolen and vital materials vanish. All of this is adding to the severe problems at the company that were already acute because of corruption, poor maintenance, crippling debts, the loss of professionals and even a lack of spare parts.

Now workers at all levels are walking away in large numbers, sometimes literally taking piecesof the company with them, union leaders, oil executives and workers say.

A job with Petróleos de Venezuela, known as Pdvsa, used to be a ticket to the Venezuelan Dream. No more.

Inflation in Venezuela is projected to reach an astounding 13,000 percent this year, according to the International Monetary Fund. When The New York Times interviewed Mr. Navas in May, the monthly salary for a worker like him was barely enough to buy a whole chicken or two pounds of beef. But with prices going up so quickly, it buys even less now.

Junior Martínez, 28, who has worked in the oil industry for eight years, is assembling papers, including his diploma as a chemical engineer. His wife and her daughter left three months ago to earn money in Brazil. “I get 1,400,000 bolívars a week and it isn’t even enough to buy a carton of eggs or a tube of toothpaste,”Mr. Martínez said of his salary in bolívars, Venezuela’s currency.

Mr. Martínez’s father, Ovidio Martínez, 55, recalled growing up here when the oil boom began. He cried as he spoke of his son’s determination to leave the country. “You watch your children leave and you can’t stop them,” the elder Mr. Martínez said, fighting back tears. “In this country, they don’t have a future.”

In El Tigre, hundreds of people stood in line one recent morning outside a supermarket, many waiting since the evening before to buy whatever food they could.

From: www.nytimes.com/June 14, 2018. Adapted.

Opportunity Cost

This phenomenon goes by the name of ‘opportunity cost,’ since by not investing in more equipment and a more rigid production flow, the company is forgoing the opportunity to earn increased profits. These costs are every bite as real as the payment of dollars out-of-pocket.

This notion _______ opportunity cost can be reinforced _________a famous saying ______ Benjamin Franklin, no slouch himself _________ operations management. To make the point, however, we must make a brief excursion into logic. One truth of logic is the validity of the so-called contrapositive, which says simply that if the statement “If A, then B” is true, then it is also true that “If not B, then not A.” That is, of every time A occurs B follows, then we can be sure that if B does not occur, then A did not occur as well. Enough logic then, and back to Ben Franklin.

One of his Poor Richard sayings is that “A penny saved is a penny earned.” We have all recognized the truth of that since childhood, but I assert that by this saying Ben showed us he knows everything about opportunity cost. After all, what is the contrapositive of “A penny not earned is a penny not saved (i.e., a penny sent). All we are saying by this notion of opportunity cost is that “a penny not earned (an opportunity forgone) is a penny spent.” We shall often have occasion to consider opportunity costs, in analyzing and deciding various operations issues.

SCHMENNER, Roger W. Production/Operations Management. 5th Edition. Prentice-Hall, 1993.

Scientists have found that generally the world feels brighter when you wake up.

People start the day in the best frame of mind in the morning, but end in the worst, at about midnight, the findings suggest, with the day of the week and the season also playing a part.

Mental health also tends to be more varied at weekends but steadier during the week, according to the study led by University College London.

“Generally, things do seem better in the morning,” the researchers concluded.

Mental health and wellbeing are dynamic in nature, and subject to change over short and long periods. However, few studies have looked at how they might change over the course of the day.

Scientists wanted to explore whether time of day was associated with variations in mental health, happiness, life satisfaction, sense of life being worthwhile and loneliness.

People in the study answered questionnaires, with questions such as: “In the past week, how happy did you feel?”, “How satisfied have you been with your life?”, and “To what extent have you felt the things you are doing in your life are worthwhile?”

Factors such as age, health conditions and whether people worked were taken into account.

The results showed that happiness, life satisfaction, and worthwhile ratings were all higher on Mondays and Fridays than on Sundays, while happiness was also higher on Tuesdays. There was no evidence that loneliness differed across days of the week.

There was clear evidence of a seasonal influence on mood. Compared with winter, people tended to have lower levels of depressive and anxiety symptoms and loneliness, and higher levels of happiness, and feeling that life was worthwhile in the three other seasons.

Mental health was best in the summer across all outcomes. But the season didn’t affect the associations observed across the day, however.

This was an observational study, so it cannot establish cause.

The Guardian.com. February 5, 2025. Adaptado.