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signals through the body that triggerthe fight-or-flight response. When theFrisbee looks like it’s headed straightfor your nose, it’s your amygdala thattells you to duck. When the rattlesnakeprepares to bite, it’s the amygdala thatmakes sure you run.Kagan hypothesized that <strong>in</strong>fants bornwith an especially excitable amygdalawould wiggle and howl when shownunfamiliar objects—and grow up to bechildren who were more likely to feelvigilant when meet<strong>in</strong>g new people. Andthis is just what he found. In otherwords, the four-month-olds whothrashed their arms like punk rockersdid so not because they were extroverts<strong>in</strong> the mak<strong>in</strong>g, but because their littlebodies reacted strongly—they were“high-reactive”—to new sights, sounds,and smells. <strong>The</strong> quiet <strong>in</strong>fants were silentnot because they were future298/929

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