Questões de Concursos Vocabulário Vocabulary

T E X T

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

Researchers have unveiled long “hidden” and finely detailed tattoo designs on the skin of ancient mummies from Peru, a study reports. Tattoos were a prevalent art form in pre-Hispanic South America, as attested by the discovery of mummified human remains in the region with preserved skin decoration that date back centuries, and even millennia.

While such body art works can provide insights into ancient cultures, tattoos are known to fade and bleed over time — a process compounded in mummies by the decay of the body. This often means that the original designs are difficult to make out.

In the latest study, published in the journal Proceedings of the National Academy of Sciences, a team of researchers used a technique known as laser-stimulated fluorescence (LSF) to examine tattoos on mummified individuals belonging to the pre-Hispanic Chancay culture of what is now coastal Peru.

The mummified remains that team of researchers examined were originally discovered in 1981 at the Cerro Colorado cemetery archaeological site in the Huaura Valley of Peru. The LSF technique revealed “exceptionally fine” and previously unknown details of the ancient tattoos.

The team managed to identify intricate geometric and zoomorphic (representing animal forms) designs that were “very surprising” because they demonstrate a higher degree of artistic complexity than any other existing Chancay artwork, including on pottery and the culture's renowned textiles. The art of tattooing was clearly important to the Chancay, as evidenced by the high proportion of tattooed individuals among known mummified remains from the ancient culture.

Hidden Tattoos Revealed on 750-Year-Old Ancient Mummies: ‘Very Surprising’. Internet: <newsweek.com> (adapted).

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Autism's Drug Problem

Many people on the spectrum take multiple medications, which can lead to serious side effects and may not even be effective

Connor was diagnosed with autism early — when he was just 18 months old. His condition was already obvious by then. “He was lining things up, switching lights on and off, on and off,” says his mother, Melissa. He was bright, but he didn’t speak much until age 3, and he was easily frustrated. Once he started school, he couldn’t sit still in class, called out answers without raising his hand and got visibly upset when he couldn’t master a math concept or a handwriting task quickly enough. “One time, he rolled himself up into the carpet like a burrito and wouldn’t come out until I got there,” Melissa recalls. (All families in this story are identified by first name only, to protect their privacy.)
Connor was prescribed his first psychiatric drug, methylphenidate (Ritalin), at age 6. That didn’t last long, but when he was 7, his parents tried again. A psychiatrist suggested a low dose of amphetamine and dextroamphetamine (Adderall), a stimulant commonly used to treat attention deficit hyperactivity disorder (ADHD). The drug seemed to improve his time at school: He was able to sit still for longer periods of time and focus on what his teachers were saying. His chicken-scratch handwriting became legible. Then, it became neat. Then perfect. And then it became something Connor began to obsess over.
“We were told that these are the gives and takes; if it’s helping him enough to get through school, you have to decide if it’s worth it,” Melissa says. It was worth it — for a while.
But when the Adderall wore off each day, Connor had a tougher time than ever. He spent afternoons crying and refusing to do much of anything. The stimulant made it difficult for him to fall asleep at night. So after a month or two, his psychiatrist added a second medication — guanfacine (Intuniv), which is commonly prescribed for ADHD, anxiety and hypertension, but can also help with insomnia. The psychiatrist hoped it might both ease Connor’s afternoons and help him sleep.
In some ways, it had the opposite effect. His afternoons did get slightly better, but Connor developed intense mood swings and was so irritable that every evening was a struggle. Rather than simply tossing and turning in bed, he refused to even get under the covers. “He wouldn’t go to bed because he was always angry about something,” Melissa says. “He was getting himself all wound up, carrying on, getting upset at night and crying.”
wound up, carrying on, getting upset at night and crying.” After seven months, his parents declared the combination unsustainable. They swapped guanfacine for over-the-counter melatonin, which helped Connor fall asleep with no noticeable side effects. But within a year, he had acquired a tolerance for Adderall. Connor’s psychiatrist increased his dosage and that, in turn, triggered tics: Connor began jerking his head and snorting. Finally, at his 9-year physical, his doctor discovered that he’d only grown a few inches since age 7. He also hadn’t gained any weight in two years; he’d dropped from the 50th percentile in weight to the 5th. That was the end of all the experiments. His parents took him off all prescription drugs, and today, at almost 13 years old, Connor is still medication-free. His tics have mostly disappeared. Although he has trouble maintaining focus in class, his mother says that the risk-benefit ratio of trying another drug doesn’t seem worth it. “Right now we’re able to handle life without it, so we do.”
(...)
For Connor, eliminating prescription drugs was difficult, but doable. For others, multiple medications may seem indispensable. It’s not unusual for children with autism to take two, three, even four medications at once. Many adults with the condition do so, too. Data are scant in both populations, but what little information there is suggests multiple prescriptions are even more common among adults with autism than in children. Clinicians are particularly concerned about children with the condition because psychiatric medications can have long-lasting effects on their developing brains, and yet are rarely tested in children.
In general, polypharmacy — most often defined as taking more than one prescription medication at once — is commonplace in people with autism. In one study of more than 33,000 people under age 21 with the condition, at least 35 percent had taken two psychotropic medications simultaneously; 15 percent had taken three.
“Psychotropic medications are used pretty extensively in people with autism because there aren’t a lot of treatments available,” says Lisa Croen, director of the Autism Research Program at Kaiser Permanente in Oakland, California. “Is heavy drug use bad? That’s the question. We don’t know; it hasn’t been studied.”

Disponível em: <https://www.scientificamerican.com/article/autisms-drug-problem/>. Texto adaptado.

INSTRUCTION: Read the following text to answer question.

Do Leveled Books Have Any Place in the Classroom?

“The little turtle can see the grass. The little turtle can see the trees. The little turtle can see the flowers”. These are the opening lines to one popular reading program’s leveled books: short, predictable texts designed for beginning readers. The patterned sentence structure – centered on the phrase “the little turtle can see" – invites students to rely on repetition and context clues to identify words they can’t sound out.

Leveled books have been a staple in early elementary reading instruction for more than two decades. But as the “science of reading” movement has spread, leveled books have come under fire. Initially, they encourage students to guess at words rather than use their phonics skills, researchers say, which can prevent children from mapping the letter-sound connections that allow them to become fluent readers.

A second problem is how they sort students into levels. Studies have shown that leveling systems are frequently inaccurate. These systems are usually created by the books’ publishers, which purport to match students with books that have a just-right alignment with their reading comprehension abilities.

In classrooms that are switching to a science of reading approach, educators are now wary of leveled books, because of the damage that they did, said Wiley Blevins, an educational consultant. In his opinion, when children are still learning the code of written language, it is required a “tight connection” between the letter-sound correspondences they’re learning and the text they’re reading, so that they have opportunities to practice. But leveled texts can’t do this job. Blevins said that the textdifficulty levels also don’t offer much practical use because they don’t tell educators what skills students still need to master – which doesn’t necessarily mean kids can’t ever pick up these books.

But what are leveled texts anyway? In many of the most popular reading programs of the last decade, leveled readers were some of the main texts that children worked with. Teachers used books for instruction, grouping students by their level and assigning them reading strategies to practice in the text. They have also been used for assessment since teachers listened to students read these books aloud, keeping a running record of their errors.

Publishers claimed that the text-leveling system could match students with books that were just right for their abilities – challenging enough to help them practice new skills, but not so challenging as to be frustrating or inaccessible. This idea is based on outdated theories about how children learn. Studies show that students can read books that are above their level with teacher and peer-provided support. They also indicate that restricting students to text at lower reading levels can actually widen achievement gaps.

However, other research has found that the leveling system isn’t even that accurate. A 2014 study showed that data from leveling assessments correctly predicted students’ reading ability only about 50 percent of the time.

The big problem with these books, though, is that they don’t help students develop their decoding skills, that is, their ability to sound out words by connecting letters tospoken sounds, said Kari Kurto, the National Science of Reading Project director at The Reading League – a group that advocates for evidence-based reading policy and classroom practice. Kurto complemented by saying that many of the words in these books aren’t written with constrained sound-spelling patterns, so “there’s no other strategy that a kid can use other than guessing,” Kurto said.

With all of this being said, one question pops up: how teachers can repurpose leveled readers?

As some districts have shifted their reading instructional practice, they have moved from leveled to decodable text – books written to give students practice with the letter-sound correspondences that they are learning in phonics lessons. However, decodable books shouldn’t be the only books that students ever see because at some point they will have to move on to more complex literature, said Blevins. In his point of view, teachers shouldn’t worry about matching students with a particular level, but rather see if they can find books that include some phonics patterns children know.

But can leveled texts build background knowledge? Some educators have repurposed leveled texts in a different way, using them to help students develop content knowledge about a subject. Research shows that students’ background knowledge is a key component of their reading comprehension ability.

According to Kurto, having more books available that might tap into kids’ different interests is valuable. Still, she draws the attention to the fact that many leveled books are written with simple themes and basic vocabulary and syntax. She said, “a lot of the leveled texts are just a little fluffy. If all [students are] getting beyond decodable text is leveled text, then it’s likely that they’re not being exposed to high-quality language and language structures.”

Although the debate about this matter is extensive and opinions are diverse, one thing is worth keeping in mind: what students read in class really matters.

Source: https://www.edweek.org/teaching-learning/doleveled-books-have-any-place-in-the-classroom/2024/10 Accessed on November 13, 2024. [Adapted]