We love the sound of laughter - but only if it's spontaneous and open mouthed, a new study reveals today. Scientists discovered laughter is only truly infectious if its an open-mouthed 'ha-ha' rather ...

Laughing is something most people do every day, but chances are we don’t really understand why we do it. "Laughter is one of a series of in-born human behaviors, along with things like coughing and ...

Recent research has revealed that animals like dogs, rats, and chimpanzees might exhibit traits similar to human laughter. Patricia Simonet discovered a unique sound in dogs during play, while Jaak ...

For many years, psychologists and behavioral biologists agreed that laughter was a unique emotional expression found only in humans. However, as the study of animal emotions expanded this idea was ...