Dr Lisa Barrett, Professor of Psychology at Northeastern University, who took part in the research, said the amygdala got bigger to cope with mankind's more hectic social life.

东北大学的心理学教授丽莎·贝瑞特博士参与了这项课题，她说人类的杏仁核变大是为了应付日益繁忙的社交生活。

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"We weren't looking to medal here," Barrett said.

贝瑞特说：“我们没想着拿奖牌。”

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The study can't sort that out. But Barrett said it might be a bit of both.

研究未能解决这一问题，但是Barrett说有可能两者相辅相成。

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The stores were interested in encouraging early preparation, said Barrett Murphy, Chicago's Year 2000 project co-manager.

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"Make no mistake it is a very delicate dance for rural state Democrats, " said Barrett Kaiser, a Democratic political consultant.

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"It seems highly opportunistic, " said Barrett, the coordinator of the U.N.

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