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Panksepp

Panksepp

Panksepp

Panksepp

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

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

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They return again and again to the hands of researchers tickling them, Panksepp's video shows .

潘克斯普拍摄的视频显示，老鼠会一次又一次地回到研究者用来咯吱它们的手上。

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