他根据进一步的研究重写了那部书。
潘克塞普曾对老鼠进行了相关研究，他发现，当老鼠玩耍的时候，他们经常发出一种唧唧喳喳很尖的声音——根据科学家表示，这是笑的一种原始形态。
Panksepp has studied rats and found that when they play, they often chirp—a primitive form of laughter, according to the scientist.
根据他的研究，每出生一代，平均智商分数就会提高20%。
According to his research, with each new generation, average IQ scores would increase by twenty percent.
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