美国巴尔的摩马里兰大学的罗伯特·普鲁文斯和他的同事做过一项典型的研究。根据他的研究，笑是一件极其严肃的事情。

According to a classic study of laughter by Robert Provine of the University of Maryland, Baltimore County, and his colleagues, laughter is an unexpectedly serious business.

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加州斯坦福大学的赖斯教授说：“女性对于回报的期待似乎更低，这在试 验中相当于卡通画的笑点。

Professor Reiss, of Stanford University in California, said: "Women appeared to have less expectation of a reward, which in this case was the punchline of the cartoon.

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“笑是欢乐，是积极地参与生活，”鲍林格林大学（Bowling GreenUniversity）心理学教授亚普·潘克斯普（JaakPanksepp）说。

"It's joy, it's positive engagement with life, " said Jaak Panksepp, a Bowling Green University psychology professor.

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