Word: cabeza
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...acre wildlife refuge in Arizona's Sonoran Desert along the Mexican border that comprises 56 miles of what the U.S. Fish and Wildlife Service calls the "loneliest international boundary in the continent." In fact, you'll have to imagine it, because while that description of the Cabeza Prieta National Wildlife Refuge still appears on its web site, there are now 1,200 miles of illegal roads and footpaths created by drug smugglers and illegal immigrants scarring the refuge...
...that is so is still unclear, but Cabeza doesn't believe the brain is programmed to get stronger as it ages. Rather, he acknowledges, in many ways it gets weaker, with neurons processing information less efficiently. The bilateralization may be a trick the brain uses to compensate for the decline, sometimes integrating the hemispheres so efficiently that our thought and reasoning processes are actually better than they were before...
...thing because one hemisphere can be busy writing a grocery list or solving an equation while the other scans the environment and tends to other basic chores. As we age, however, the walls between the hemispheres seem to fall, with the two halves working increasingly in tandem. Neuroscientist Roberto Cabeza of Duke University dubs that the HAROLD (hemispheric asymmetry reduction in older adults) model, and judging by his work, the phenomenon is a powerful...
...Cabeza recruited a sample group of adults 65 to 95 years old who had scored high on a memory test, along with a group of lower-performing adults of the same age and a group of younger, college-age adults. He then asked them all to perform a series of tasks that called on numerous skills, including language, memory, perception and motor functions. Throughout the tasks, he conducted functional magnetic resonance imaging scans of their brains. Again and again, he found that the high-functioning older adults were using either a hemisphere different from the one the other subjects were...
...similar to the way you need both hands to lift a weight that you could lift with one hand when you were younger," Cabeza says. "In the brain, there's a nice, natural distribution of resources. You get more neural tissue to support the task...