And laughter is not just a thing of people. Chimps tickle(挠痒) each other and even laugh when another chimp pretends to tickle them.

　　Jaak Panksepp, a Bowling Green University Psychology professor, studies rats that laugh when he tickles them. It turns out rats love to be tickled—they return again and again to the hands of researchers tickling them.

　　By studying rats, scientists can figure out what's going on in the brain during laughter. Northwestern University biomedical engineering professor, Jeffrey Burgdorf has found that laughter in rats produces a chemical that acts as an antidepressant(抗抑郁药). He thinks the same thing probably happens in humans, too. This would give doctors a new chemical target to develop drugs that can fight depression.

　　Even so, laughter itself has not been proved to be the best medicine, experts say. Margaret Stuber, a professor at University of California, studied whether laugher helped patients. She found that distraction(分心) and mood improvement helped, but she could not find a benefit of laughter alone.

　　“No study has shown that laughter produces a direct health benefit，” Provine said, largely because it's hard to separate laughter from just feeling good. But he thinks it doesn't really matter, “Isn't the fact that laughter feels good when you do it enough？”

　　1．The most important finding of Robert Provine's research is that ________．

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