Beyond a Joke: From Animal Laughter to Human Joy?

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Science  01 Apr 2005:
Vol. 308, Issue 5718, pp. 62-63
DOI: 10.1126/science.1112066

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Laughter and joy are considered to be uniquely human characteristics. However, as Panksepp explores in his Perspective, recent studies in chimps, dogs, and rats reveal that animals also exhibit laughterlike sounds when they are horsing around and having fun.