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28 февраля 2018 г. 05:45

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Marc Leishman (L) of Australia greets his wife and newborn girl during the BMW Championship golf tournament at Conway Farms Golf Club in Lake Forest of Illinois Cheap Nike Air Max 97 , the United States, on Sept. 17, 2017. (XinhuaJoel Lerner)






Special snacks displayed during 14th China-ASEAN Expo


Scenery of paddy fields in Baicheng Cheap Nike Air Max 90 , NE China's Jilin


China Focus: World's oldest panda dies aged 37


Scenery of terraced fields at Wuyishan in SE China's Fujian


Intangible cultural heritage: Clear Noodles in Chili Sauce


Bird's-eye view of Zibo City in east China


Fire drill held in S China's Guangxi


China, Pakistan air forces hold joint training exercises




SAN FRANCISCO, Aug. 7 (Xinhua) -- Researchers at the University of California, Berkeley, suggest brains that continue to perform well in old age, against odds that they are slower and less accurate in short-term memory compared to those of younger people, do so by rallying more of the brain to complete mental tasks.


"We think this pattern of increased connectivity between frontal regions and other modules in the brain reflects a more integrated network architecture that is key for successful performance of executive control tasks in aging," said UC Berkeley graduate student Courtney Gallen, who worked with her colleagues on a study published in the August issue of the journal Neurobiology of Aging.


Under the direction of her thesis adviser Mark D' Esposito, a UC Berkeley professor of psychology, the researchers compared 18 adults in their 20s to 38 healthy people age 60 and older.


They found that the older study subjects showed larger changes than younger subjects in the organization of brain networks between a task-free state and performing a task, and that those who did not exhibit this adaptation in brain signaling were less adept in performing tasks.


"Executive control" functions are thought to underlie humans' ability to flexibly change thinking and behaviors and to solve problems.


Using functional magnetic resonance imaging (fMRI) to track communication within specific brain sub-networks - called modules - and connections made across different modules, the researchers also found that the structural integrity of the superior longitudinal fasciculus (SLF), which anatomically connects frontal and posterior brain regions important for short-term memory, was associated with older subjects' likelihood of exhibiting the transition to the more interconnected communication between brain regions that in turn was linked to better performance of tasks.


With focus was on the frontal cortex, which is critical for executive functions, and its connections to other parts of the brain during fMRI scanning, the researchers asked participants to perform four different tasks in two-minute trials, with five trials assigned to each participant for each task.


Images of faces and scenes, each selected from a set of 10, were flashed before the subjects sequentially, with each displayed for six-tenths of a second, followed by a pause of varying length before the next was displayed.


The easiest task required participants to press a button to categorize a displayed image as either a scene or a face, and the most difficult task was to recall both the previous face and previous scene.


Compared to a task-free "resting state," older adults performing tasks of any difficulty recruited additional between-module connections. In contrast, younger adults recruited additional between-module connections only for the most difficult task.


Most previous research in which researchers looked at age-related changes in brain function due to specific cognitive demands focused on activation of individual brain regions rather than taking a network approach, Gallen said in a news release from UC Berkeley.


Earlier studies showed that frontal activity in the brain increases in older adults compared to younger adults during less-demanding cognitive tasks.


"Our new results further support the idea of compensatory recruitment and suggest a large-scale network-level mechanism by which the aging brain reorganizes to support executive control processing," she said.


PARIS, June 3 (Xinhua) -- On a matchday spoiled by the rain Cheap Nike Air Max 95 , top seed Andy Murray and No. 3 seed Stan Wawrinka shrugged off a lackluster start to sweep into the men's singles last 16 at the 2017 French Open here on Saturday.


The rain, which became increasingly heavy around 5 p.m. local time, affected a total of 10 matches on different courts. The referee made a decision to suspend the match as the condition was not fit to play. Fans left their seats to hide from the rain Cheap Nike Air Max , and the court was later covered with a hug tarp.


All remaining matches on Saturday will be put off until Sunday, the organizing committee announced around 7:15 p.m. local time.


Murray led 6-3 in their previous nine meetings against Juan Martin Del Potro, who lost to him in the final at the Rio Olympic Games last year.


Murray needed almost one and a half hours to nail the first set as he uppered in the tiebreak 10-8 Cheap Air Max 97 , only to see their Argentine opponent stand at the net for a while to show frustration between the interval.


"Too much frustration. I couldn't believe that I lost that set, because I had many opportunities to win. I have been playing great, great points during the whole first set Cheap Air Max 90 ," said Del Potro.


Murray, who finished a total of 44 winners and converted 6 of 17 break points, prevailed in the following two sets with 7-5 Cheap Air Max 95 , 6-0.


"When he's playing well, he is one of the best players in the world," Murray commented on Del Potro's performance Cheap Air Max , adding that playing against the Argentine this early in the Grand Slam tournament is obviously not easy, but can be a very positive thing at the same time.


Wawrinka won in a similar manner, as he. NFL Jerseys China   Authentic NHL Jerseys Cheap   Baseball Jerseys From China   Jerseys Free Shipping   NHL Jerseys Wholesale   MLB Jerseys Wholesale   Adidas NHL Jerseys From China   Nike NFL Jerseys From China   NFL Jerseys Online   College Baseball Jerseys Cheap 

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