Richard davidson was in a lab observing a buddhist monk sink deep into serene meditation when he noticed something that sent his own pulse racing. Davidson, a professor of psychology and psychia-try at the University of Wisconsin, hurriedly double-checked the data streaming to his computer from electrodes attached to the monk's skull, but there was no mistake. Electrical activity in the left prefrontal lobe of the monk's brain was shooting up at a tremendous rate. "It was exciting," Davidson recalls. "We didn't expect to see anything quite that dramatic." Davidson's excitement is all the more significant because he's known by colleagues as the king of happiness research. When he made the discovery five years ago, he had been studying the link between prefrontal-lobe activity and the sort of bliss deep meditators experience. But even for someone with his experience, watching the brain crackle with activity as a person entered a trancelike state was unprecedented. It made clear, says Davidson, who published the research study in the Proceedings of the National Academy of Sciences last fall, that happiness isn't just a vague, ineffable feeling; it's a physical state of the brain-one that you can induce deliberately.
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