Researchers say a new electrical device placed in three paralyzed patients has helped them walk again. The lower bodies of the three patients were left paralyzed after they suffered spinal (脊柱的) cord injuries. But a device implanted in the spinal cord was able to send electrical signals to the muscles to permit them to stand, walk and exercise.
Scientists have discovered that neurons—which receive and send signals for muscle movements—often still work in injured patients with serious spinal cord injuries. However, past research into spinal cord injuries has centered on the stimulation of neurons. Now in the latest experiment led by Gregoire Courtine and Jocelyne Bloch of the Swiss Federal Institute of Technology in Lausanne, three paralyzed men were implanted a new electrical device designed to copy an action of the brain, in which it sends signals to the spinal cord that result in muscle movement. When the spinal cord receives the brain signals, it stimulates a collection of nerve cells that can activate different muscles.
The researchers reported that all three patients who got the spinal cord implants were able to take their first steps within an hour after receiving them. Over the next six months, the patients regained the ability to take part in more advanced walking activities, the study found. They were also able to ride bicycles and swim in community settings.
Unlike other attempts to help paralyzed patients walk by stimulating nerves through the back of the spine, Courtine said that his team redesigned the devices so signals would enter the spine from the sides. This method permits more direct targeting and activation of spinal cord areas, he said.
The team then developed artificial intelligence (AI) systems linked to the device. The AI controls electrodes on the device to send signals to stimulate individual nerves that control muscles needed for walking and other activities. However, because the patients’ muscles were weak from not being used, they needed help with supporting their weight, the researchers said. It also took some time for them to learn to work with the technology. Still, Bloch said, “The more they train, the more they start lifting their muscles, the more fluid it becomes.”
1. What can be inferred from paragraph 2?A.Courtine and Bloch have found that neurons in paralyzed patients still work. |
B.The new electrical device can imitate the brain to send signals to the spinal cord. |
C.Three paralyzed men recovered with the help of a new electrical device. |
D.Stimulating the neurons is the focus of the latest research into spinal .cord injuries. |
A.By stimulating nerves through the back of the spine. |
B.By using the AI system. |
C.By making signals enter the spine from the sides. |
D.By sending the signals to the brain. |
A.Every garden has its weeds. |
B.Put the cart (运货马车) before the horse. |
C.It's hard to please all. |
D.Practice makes perfect. |
A.To report the consequence of spinal cord injuries. |
B.To introduce the findings of a recent research. |
C.To compare a recent research with other previous researches. |
D.To recommend a treatment for paralyzed patients. |
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【推荐1】The U. S. Food and Drug Administration (FDA) has approved a debatable Alzheimer's treatment, the first that promises to slow the disease's destruction in the brain.
The drug, aducanumab, is also the first new Alzheimer's treatment approved since 2003.However, in 2019, aducanumab was nearly abandoned after it appeared unlikely to succeed in two clinical trials. But after reanalyzing more data, the drug's developer Biogen saw signs indicating the drug might work, and decided to pursue FDA approval.
Still, today's decision concerns some doctors and scientists because they aren't convinced that the drug actually works. Approving a drug that's not effective would offer patients false hope, those experts argue. “This is a great day for Biogen but a dark day for the field of Alzheimer's research,” says Michael Greicius, a neurologist at Stanford. Pushing forward on the “illusion of progress,” he says, “will come at a cost to genuine progress in finding an effective treatment for this destructive disease.”
Others disagree that the evidence is slim, and are excited about having a new tool to fight a disease that has escaped an effective treatment for so long. “We have been waiting decades for this,” says Maria Carrillo, an expert at the Alzheimer's Association. A drug that delays decline due to Alzheimer's promises patients “to sustain independence and to hold onto memories longer,” she says.
The drug targets the sticky protein—A-beta(淀粉样蛋白). Some researchers suspect that in Alzheimer's, A-beta confuses connections between nerve cells and damages brain tissue, ultimately causing Alzheimer's symptoms. But that idea is still unsettled. Brain scans reveal that aducanumab is effective at reducing A-beta in the brain. What's less clear is whether this reduction comes with consistent improvements in people's quality of life.
1. What does paragraph 2 mainly tell us about aducanumab?A.Its bitter failure in clinical trials. |
B.Its tough path to getting recognized. |
C.Its medical value in treating Alzheimer's. |
D.Its challenging process of being produced. |
A.Proof. | B.Significance. | C.Prospect. | D.Misunderstanding. |
A.Unconcerned. | B.Doubtful. | C.Positive. | D.Intolerant. |
A.A-beta in human body should be removed. |
B.Aducanumab has potentially serious side effects. |
C.A-beta's decrease improves people's quality of life. |
D.Further tests on aducanumab need to be carried out. |
【推荐2】Each year there are at least five million people around the world who develop serious flu (流感), and almost half a million deaths. When someone we know gets the flu virus, we expect them to be very careful not to pass it on to others. Doctors and nurses working with flu patients also need to protect themselves from the virus. But what is the best way to do this? This is the question that flu expert Professor Jonathan
Van-Tam at Nottingham University is trying to answer. He wants to find out how flu is transmitted, so that he can stop doctors and nurses getting sick.
Van-Tam explains their method, "There are 41 volunteers in my experiment. Some healthy volunteers are made to get flu first. When they show symptoms (症状 ) , other volunteers, usually called recipients(接受者), enter the house. Everyone lives together in the small space for four days. Some of the recipients wear face masks, and wash their hands every 15 minutes, but some have no protection. In this way we can study who catches the flu and which ways of transmitting flu are important. During the four days when they are in contact with the virus, and for the ten days after that, the flu recipients are checked regularly."
The experiment is not simple and it is very expensive. It is difficult to design correctly, and it is also difficult to plan and carry out. Just one study like this takes about 18 months to organize and needs hundreds of people working on it. But Van-Tam believes it is worth because the results will help to decide what type of protection is needed for people working in hospitals with large numbers of flu patients around the world. And perhaps it could reduce the number of deaths from flu each year.
1. Which word can replace the underlined word “transmitted" in paragraph l ?A.solved | B.passed | C.formed | D.stopped |
A.to test the medicines for people who develop serious flu |
B.to find the best way to protect doctors and nurses from the flu. |
C.to reduce the number of people who die of flu |
D.to find out who gets the flu easily |
A.This type of study lasted 18 months. |
B.The experiment is neither simple nor expensive. |
C.Recipients were divided into at least 2 groups to perform the experiment. |
D.Wearing masks was the best way to protect people from getting flu |
【推荐3】Huge health care bills, long emergency-room waits and the inability to find a primary care physician just scratch the surface of the problems that patients face daily.
Primary care should be the backbone of any health care system. Countries with appropriate primary care resources score highly when it comes to health outcomes and cost. The U.S. takes the opposite approach by emphasizing the specialist rather than the primary care physician.
A recent study analyzed the providers who treat Medicare beneficiaries (老年医保受惠人). The startling finding was that the average Medicare patient saw a total of seven doctors—two primary care physicians and five specialists—in a given year. Contrary to popular belief, the more physicians taking care of you don’t guarantee better care. Actually, increasing fragmentation of care results in a corresponding rise in cost and medical errors.
How did we let primary care slip so far? The key is how doctors are paid. Most physicians are paid whenever they perform a medical service. The more a physician does, regardless of quality or outcome, the better he’s reimbursed (返还费用). Moreover, the amount a physician receives leans heavily toward medical or surgical procedures. A specialist who performs a procedure in a 30-minute visit can be paid three times more than a primary care physician using that same 30 minutes to discuss a patient’s disease. Combining this fact with annual government threats to indiscriminately (任意地) cut reimbursements, physicians are faced with no choice but to increase quantity to boost income.
Primary care physicians who refuse to compromise quality are either driven out of business or to cash-only practices, further contributing to the decline of primary care.
Medical students are not blind to this scenario. They see how heavily the reimbursement deck is stacked against primary care. The recent numbers show that since 1997, newly graduated U. S. medical students who choose primary care as a career have declined by 50%. This trend results I emergency rooms being overwhelmed with patients without regular doctors.
How do we fix this problem?It starts with reforming the physician reimbursement system. Remove the pressure for primary care physicians to squeeze in more patients per hour, and reward them for optimally (最佳的) managing their diseases and practicing evidence-based medicine. Make primary care more attractive to medical students by forgiving students loans for those who choose primary care as a career and reconciling the marked difference between specialist and primary care physician salaries.
We’re at a point where primary care is needed more than ever. Within a few years, the first wave of the 76 million Baby Boomers will become eligible for Medicare. Patients older than 85, who need chronic care most, will rise by 50% this decade.
Who will be there to treat them?
1. We learn from the passage that people tend to believe that ________.A.the more costly the medicine, the more effective the cure |
B.seeing more doctors may result in more diagnostic errors |
C.visiting the same doctor on a regular basis ensures good health |
D.the more doctors a patient sees, the better |
A.increase their income by working overtime |
B.improve their expertise and service |
C.see more patients at the expense of quality |
D.make various deals with specialists |
A.Bridge the salary gap between specialist and primary care physicians. |
B.Extend primary care to patients with chronic diseases. |
C.Recruit more medical students by offering them loans. |
D.Reduce the tuition of students who choose primary care as their major. |
A.The Health Care in Trouble | B.The Imbalance System |
C.The Declining Number of Doctors | D.The Ever-rising Health Care Costs |
【推荐1】Superman,the first American superhero,appeared in 1938 with his cape (斗篷) and an “S” on his chest. Shortly after his appearance in comics, moviemakers began trying to bring superheroes to the big screen. In the early 1940s, they made their first attempts to bring comic books to life.
This pattern changed in 1978 when Richard Donner made his first Superman film. First of all, it was aimed at an adult audience.
Yet another revolution in superhero movies came in the 1990’s and 2000’s, when Computer-Generated Image technology made it possible to recreate even more fantastic landscapes and more monstrous(可怕的)creatures.
A.Richard Donner was born on April 24, 1930 in New York City. |
B.Most of these early superhero films were not full-length movies. |
C.The film had a complex plot, dealing with themes like love and politics. |
D.As superhero movies are popular every year, it is clear this trend is far from over. |
E.Many films used such technology to make their characters seem terrifyingly real. |
F.Some of those stars were Christopher Reeve, Margot Kidder, and Gene Hackman. |
G.The character of Superman was created by writer Jerry Siegel and artist Joe Shuster. |
【推荐2】Studies have shown that to cultivate (培养) gratitude can increase an individual’s happiness, reduce one’s sadness, and give strength to a person. Those who consciously express and cultivate gratitude have been reported to have much higher self-esteem (自尊) compared to those who do not. They are also more willing to help others.
Wondering how you yourself can cultivate gratitude more and more every single day? Below are some wonderful tips to follow.
A board on the wall is a great boost, especially in work environments.
Give heart-felt thanks. It’s not your casual thank you, like saying “hi” without really thinking about it. We’re talking about good quality, deeply grateful, heartfelt thanks. When someone goes out of their way to do something really important for you, you should make them know how grateful you are to them.
A.Gratitude cards. |
B.Gratitude journal. |
C.This type of behavior always connects to greater happiness. |
D.And you can’t wait to help others see this positive change as well. |
E.The board lets everyone write down what they are grateful for. |
F.And let them believe you can’t wait to do something awesome for them, too. |
G.Just imagine the positive culture shift if everyone went ahead and thanked other people for their help. |
【推荐3】The release of ChatGPT has caused more than a little worry about its ability to produce credible pieces of writing. “The College Essay Is Dead, ” some people declared. That’s unlikely. There are obvious workarounds. For example, students wouldn’t benefit from ChatGPT if they were required to write out essays by hand.
A return to handwritten essays could benefit students in a way. For instance, neuroscience research has revealed that the act of handwriting is very different from punching letters on a keyboard. Handwriting requires precise motor skills that stimulate greater activity in a broader group of brain regions when compared with typing and engage the brain in ways that researchers have linked to learning and memory improvements. Handwriting forces those areas responsible for memory and learning to communicate with each other, which helps form networks that facilitate the recall and acquisition of new information.
Much of the research has focused on children or younger students. But there’s evidence that, even for older students and adults, completing assignments in longhand is a more cognitively (认知地) involved process, leading to better processing of ideas and more original work. Meanwhile, research on foreign-language learners has found that handwriting is associated with improvements in some measure of accuracy and comprehension. Handwriting requires you to put a filter on what you’re producing in a way that typing doesn’t. When you’re writing by hand, you need to know what you want to say before you begin. If you don’t, you’ll have to cross things out or start over. Typing on a computer requires far less forethought. It is less challenging for the brain-and challenging the brain is central to education itself.
A return to handwritten essays wouldn’t be easy on teachers, who might have to reduce the length of assignments or allocate (分配) extra class time for completion. They’d also have the burden of reading text that wasn’t neatly turned out by a word processor. But some might find all that preferable to being constantly suspicious (猜疑的) that they’re being outsmarted by a computer program.
When health issues forced the German philosopher Friedrich Nietzsche to abandon his pen in favor of a typewriter, a change occurred in his writing style, which one scholar later described as a departure from “sustained argument and prolonged reflection” to a “telegram style. ” Our writing tools work on our thoughts. Ensuring that today’s students have more than one writing tool might pay off in ways experts are only beginning to grasp. ChatGPT and other AI-powered technologies will win only if we agree to play on their home territory.
1. How can handwriting benefit students?A.It enhances brain engagement. |
B.It guarantees accurate comprehension. |
C.It creates networks for communication. |
D.It facilitates the assessment of information. |
A.Carefully screen. | B.Passively accept. |
C.Objectively assess. | D.Gradually discover. |
A.The risk of weakened concentration. |
B.The fear of being outsmarted by AI. |
C.The trouble of marking untidy work. |
D.The content of handwritten essays. |
A.College education will be reformed by ChatGPT |
B.Handwriting will replace typing due to ChatGPT |
C.Handwritten essays can help teachers defeat ChatGPT |
D.College teachers return to longhand to battle ChatGPT |