When the Head Rules the Heart
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YHu [G/X Some heart attacks may be all in your head. Scientists in Canada have found a region in the brain that may control the ac- tivity of the heart and blood vessels. They say that abnormalities in this region could account for the hundreds of thousands of otherwise unexplained cardiac arrests??? that occur every year.
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gc Andrew King, David Cechetto and their colleagues at the University of Western Ontario in London reported at the meeting that they asked five subjects to carry out simple tasks that raise blood pressure. For instance, they were told to squeeze a cylinder as tightly as possible, or hold their breath for several seconds. As they did this, the researchers monitored the subjects' blood pressure and heart rate throughout.
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=p6xc}N The team then asked all the subjects to repeat the tasks while in a high-resolution functional magnetic resonance??? brain scanner, and watched which areas of the brain the tasks activated. It turned out that all the tasks activated a spot in the insular cortex, which is tucked inside a fold in the brain just above ear level.
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