One morning 10 years ago, psychologist Jaak Panksepp walked into his lab and made an unusual proposition to a research assistant: “Come tickle some rats with me!” Panksepp wasn’t just trying to ...

The way people laugh when tickled is “uniquely different” from other laughter such as when hearing a joke, according to a new study. Researchers at the University of Amsterdam say both machines and ...

Like human infants, young apes are known to hoot and holler when you tickle them. But is it fair to say that those playful calls are really laughter? The answer to that question is yes, according to ...

• Lines close to your heart make your heart laugh. Then your heart tickles your brain, and it laughs. Then your brain makes you laugh. Nicolas Villegas, grade 2, Glen Acres • Because your skin is ...

Apes often make weird sounds when they're tickled, and some researchers now say these pants and hoots truly are related to human laughter. That's the conclusion of a new study in the journal Current ...