ANCHORAGE, Alaska (KTUU) - Laughter has always been somewhat of a mystery. There’s little information on why humans do it, but we know we’re not the only ones who do. In fact, rats can and do laugh, ...

Rats have what appears to be a “laugh centre” in their midbrain that is activated when the animals are tickled or when they engage in play behaviours. Researchers first discovered that rats could ...

If you tickle a rat's belly, it squeals with laughter. However, we are unable to perceive this laughter as its frequency, around 50 kHz, exceeds the range of human hearing. Neuroscientist Jaak ...

A technique that is increasingly used worldwide to improve the welfare of rats in research is rat “tickling”—whereby humans make light, brisk, and vigorous movements with their fingertips on a rat’s ...

WASHINGTON — So a scientist walks into a shopping mall to watch people laugh. There's no punchline. Laughter is a serious scientific subject, one that researchers are still trying to figure out.