As we age, our ability to think and remember stars to deteriorate. It is normal for old age to be associated with gradual decline in memory and brain mass.
Scientists know that parts of the brain decrease in size with age. But in super-agers that process is much slower. Emily Rogalski is a neuro-scientist at Northwestern University's Feinberg School of Medicine, in Chicago, Illinois. In a recent study, she showed that super-agers have young brains. The area of the brain responsible for attention and memory -- the cortex (脑皮层)— was shown to be thicker in super-agers.
"When we look at the cortex of their brain, we see that, on average, it looks more like a 50-year-old brain than it looks like an average 80-year-old brain."
Several factors affect how our brains age. Scientists say super-agers have several things in common, including an active lifestyle. Many travel and play sports. They are often big readers.
Super-agers also seem to have certain common personality traits. Rogalski says they are, for the most part, known for their optimism, resilience and perseverance. Growing old, she adds, does not have to be depressing and sad. "Perhaps, if we expected a bit better from ourselves, then we would understand that not all aging is doom and gloom."
Gurolnick's own father was diagnosed with Alzheimer's in his fifties Solving this mystery, Rogalski says, may help those who suffer from brain diseases such as Alzheimer's.
"We think if we can understand the factors contributing to super-aging, it may offer new hypotheses and new ways to explore the challenges in Alzheimer's disease."
A.Nowadays scientists are peeking into the brains of these "super-agers" to uncover their secret. |
B.As lead investigator of the study, Rogalaski jokingly said that super-agers do not grow on trees. |
C.And they usually have healthy relationships and spend time with friends. |
D.Not only do super-agers have thicker cor-texes, they have more von Economo neurons. |
E.However, there are reports of individuals who seem immune to age-related memory impairment. |
F.It's pretty extraordinary for people in their 80s and 90s to keep the same sharp memory as someone several decades younger. |
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【推荐1】When we see cute babies, or adorable baby animals, many of us feel a strong urge to squeeze or pinch them or even bite them. Scientists call this strange response “cute aggression”.
Stavropoulos’s team gathered 54 people to look at 32 pictures of four sets. One set contained photos of cute baby animals. Another set contained pictures of less-cute, fully grown animals. The other two sets were photos of human babies which were digitally edited. One set was changed to emphasize features we find cute, such as big eyes and full cheeks. The other was edited to reduce those features.
The scientists found that the participants had much more feelings of cute aggression towards images of baby animals than those of adult animals. Surprisingly, this difference was not seen from the two sets of human baby pictures in comparison.
To assess cute aggression, the participants were asked questions about the degree of wanting to aggress the subjects of the photos, and of wanting to care for them. Scientists suspect these rosponses are associated with not only the brain’s emotional systems, but also its reward systems, which adjust motivation, pleasure and feelings of “wanting”.
Cute aggression may give humans the highly adaptive ability to control emotional response. To limit the motivation of positive feelings, the brain gives commands of the aggression. In other words, the brain throws in a bit of aggression to keep the good feelings from becoming uncontrolled. “If you find yourself fascinated by how cute a baby is, -so much so that you simply can’t control it-that baby is going to starve.” It stops us from investing too much energy into cute things. So, there is no need to feel bad for the desire to pinch them at the sight of cute babies. It’s not because we’re mean people. The “unfriendly” movement of our fingers is just our brain’s way of making sure nothing gets too cute to handle.
1. What was found in Stavropoulos’s experiment?A.Human’s brain has two systems. |
B.Cute aggression exists in every human being. |
C.Cute aggression varies towards different subjects. |
D.Humans like to aggress animals rather than care for them. |
A.It is a normal response in the brain. | B.It is still a mystery. |
C.It does harm to the animals. | D.It makes humans become mean. |
A.Doubtful | B.Supportive | C.Disapproving | D.Unclear |
【推荐2】Ambition (志向,抱负) is a necessary quality in life. It is the force which drives us on to use whatever talent we have got.
Besides, our ambition can be too concentrated. We devote our attention to one narrow aim, such as getting distinctions in our science subjects. Everything that may draw us away from this aim is cutout of our lives. In the end we get our distinctions. But we are isolated beings who only care about particular examination. And we probably won’t make good scientists.
And our ambition can be limited to lifeless objectives.
A.Still, ambition can have several disadvantages |
B.Because our ambition may make us among selfish people |
C.Unless we have got some degree of ambition |
D.Since we don’t have the breadth of view necessary for greater success |
E.Ambition is necessary in the lives of individuals |
F.As long as tightly controlled by the head and the heart |
G.We want to gain money, or power, or membership of some circles |
Most people don’t need science to appreciate the importance of a mother’s love.
But to understand how early maltreatment can derail a child’s development requires careful study. In a famous research, Harry Harlow had demonstrated that proper psychological and physical development of infants requires nurturing and attention from a parent.
Such experimentations sound cruel. They, however, have been critical in helping change policies in human orphanages( 孤儿院 ) in the U.S. For centuries some orphanages treated infants equally inhumanely. Despite early evidence that orphanage infants were far more likely to die than others, supporters argued that it didn’t matter whether children had “parents” specially devoted to them at the orphanage.
The harrowing consequences of these theories were most vividly brought to light in Romania in the 1980s and ‘90s. A ban on abortion(流产 ) led to a surge in orphanage babies. Simply being fed and changed without individualized affection, some babies present serious problems. Many developed violent behaviors, repetitively rocking or banging their heads. Some were cold and withdrawn or indiscriminately affectionate.
They even had problems with attention and comprehension. The longer these children were left alone, the more damage was seen.
The lack of a secure attachment relationship in the early years has destructive consequences for both physical and mental health later in life, with long-lasting effects. The persistence of these effects emphasizes the need to intervene early in life. The Nobel-prize-winning economist James Heckman, has long argued that investing in early childhood education provides a greater return for society than virtually any other type of spending. It is obviously reflected in increased educational success and productivity,. The reduced crime, addiction, distress and disorder point to the same theory. Early life conditions critically affect adult life.
A.The appropriate feeding and caring styles were greatly rewarded in all aspects. |
B.It was claimed that simply feeding and changing them would be adequate. |
C.Some, however, demonstrate little influence with roughly ordinary behavior pattern. |
D.Maternal attachment plays a fundamental role in shaping who we are. |
E.Necessities are not just the availability of food and water. |
F.And they simply didn’t grow like normal infants. |
【推荐1】In the idealized version of how science is done, facts about the world are waiting to be observed and collected by objective researchers who use the scientific method to carry out their work. But in the everyday practice of science, discovery frequently follows an unclear and complicated route. We aim to be objective, but we cannot escape the context of our unique life experience. Prior knowledge and interest influence what we experience. Opportunities for misinterpretation are everywhere.
Consequently, discovery claims should be thought of as early forms of science and are full of potential. But it takes collective inspection and acceptance to transform a discovery claim into a mature discovery. This is the credibility process, through which the individual researcher’s me, here, now becomes the community’s anyone, anywhere, anytime. Objective knowledge is the goal, not the starting point.
Once a discovery claim becomes public, the discoverer receives intellectual credit. But the community takes control of what happens next. Within the complex social structure of the scientific community, researchers make discoveries; editors and reviewers act as gatekeepers by controlling the publication process; other scientists use the new finding to suit their own purposes; and finally, the public (including other scientists) receives the new discovery and possibly accompanying technology. As a discovery claim works it through the community, the interaction and battle between shared and competing beliefs about the science and the technology involved transforms an individual’s discovery claim into the community’s credible discovery.
Two problems exist throughout this credibility process. First, scientific work tends to focus on some aspect of current knowledge that is viewed as incomplete or incorrect. Little reward accompanies repetition and confirmation of what is already known and believed. The goal is new-search, not re-search. Not surprisingly, newly published discovery claims and credible discoveries that appear to be important and convincing will always be open to challenge and potential modification or contradiction by future researchers. Second, novelty itself frequently provokes disbelief. Nobel Laureate and physiologist Albert Azent-Gyorgyi once described discovery as “seeing what everybody has seen and thinking what nobody has thought.” But thinking what nobody else has thought and telling others what they have missed may not change their views. Sometimes years are required for truly novel discovery claims to be accepted and appreciated.
In the end, credibility “happens” to a discovery claim — a process that corresponds to what philosopher Annette Baier has described as the commons of the mind. “We reason together, challenge, revise, and complete each other’s reasoning and each other’s conceptions of reason.”
1. According to the first paragraph, the process of discovery is characterized by its ________.A.uncertainty and complexity | B.misconception and falsehood |
C.logicality and objectivity | D.systematicness and regularity |
A.strict inspection | B.shared efforts | C.individual wisdom | D.persistent innovation |
A.scientific claims will survive challenges | B.discoveries today inspire future research |
C.efforts to make discoveries are justified | D.scientific work calls for a critical mind |
A.Novelty as an Engine of Scientific Discovery | B.Collective Inspection in Scientific Discovery |
C.Evolution of Credibility in Doing Science | D.Challenge to Credibility at the Gate to Science |
【推荐2】An international team of researchers from the University of Oxford have found that the way people use the Internet is closely tied to the seasonal movements in the natural world. Their online species searches follow the patterns of seasonal animal migrations (迁徙).
Migratory birds ( 候 鸟 ) flood back to where they reproduce every spring. That migratory behavior is accompanied by some human behavior. “In English-language Wikipedia ( 维基百科), the online searches for migratory species tend to increase in spring when those birds arrive in the United States,” said the lead author John Mittermeier.
And not just birds. Mittermeier and his team surveyed nearly 2.5 billion Wikipedia search records, for 32,000 species, across 245 languages. They also saw variable search rates for insects, horsetails and flowering plants. Seasonal trends seemed to be widespread in Wikipedia behavior for many species of plants and animals.
This finding suggests new ways to monitor changes in the world’s biological diversity. It also shows new ways to see how much people care about nature, and which species and areas might be the most effective targets for conservation.
Mittermeier is encouraged by the search results. He commented, “I think there’s a concern among conservationists (生态环境保护者) that people are losing touch with the natural world and that they’re not interacting with native species anymore. And so in that sense, it was really exciting and quite unexpected for me to see people’s Wikipedia interest closely related to changes in nature.” Richard Grenyer, Associate Professor from the University of Oxford, says search data is useful to conservation biologists, “By using these big data approaches, we can direct our attention towards the difficult questions in modern conservation: which species and areas are changing, and where are the people who care the most and can do the most to help.”
1. What have researchers found about species searches?A.They strengthen ties among people. | B.They affect the animal movements. |
C.They reflect animal migration seasons. | D.They differ in language backgrounds. |
A.To further support the research findings. |
B.To show the variety of species searches. |
C.To summarize the research process. |
D.To present researchers’ heavy work load. |
A.Sad about people’s not getting close to nature. |
B.Worried about Wikipedia behavior. |
C.Amazed at people’s care about nature. |
D.Satisfied with Wikipedia’s service. |
A.A scientific magazine. | B.A biology textbook. |
C.A biography. | D.A travel brochure . |
【推荐3】How many phone numbers can you remember by heart? It’s probably fewer than you would like. Actually, you’re not alone. Some said that they couldn’t recall the phone numbers of their friends and neighbors. And others said that they couldn’t remember their relatives, phone numbers. In their eyes, there is no point in filling their heads with phone numbers if they’re all stored in smart phones that are with them almost all the time.
In fact, most people are suffering from a sort of digital amnesia(健忘). More than 90%℉ those agreed that they used the Internet as an online extension of their brains. Rote memorization(死记硬背) was once an important part of education, but we just need a click the computer or slide now. That’s making us worse at remembering things.
However, I believe that there are more risks to this new world of memory beyond losing our ability to recall some information such as who the 15th President was. That kind of information may always be a click away, but the important things are personal ones, like the way your parents smile at your wedding. It’s harder to recall or find online. If you’re relying on yourself to keep track of those memories, they will be much more meaningful.
1. Paragraph 1 is mainly used to ________.A.serve as the background of memory | B.introduce the topic |
C.explain a new research | D.study people’s memory |
A.Dealing with too many things. |
B.Seldom thinking about questions. |
C.Relying on the Internet too much. |
D.The changes of their meme. |
A.Worried. | B.Optimistic. | C.Disappointed. | D.Confident. |