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Rats laugh if you tickle their tummies, scientists find
Friday November 11th 2016
Tummy-tickling causes rats to break out in giggles and jump with joy - but only when they are happy, a study shows.
Scientists confirmed the ticklishness of rats in experiments involving researchers laying the animals on a platform and tickling them mercilessly with a gloved hand.
The rats responded by approaching the tickler, jumping joyfully, and emitting ultrasonic squeaks beyond the range of human hearing that bore a striking resemblance to laughter.
By monitoring activity in the rat's brains, the scientists confirmed that the animals were behaving in much the same way people do when tickled.
Like humans, they are only able to enjoy being tickled when they are in a good mood.
Tickling-evoked laughter was greatly reduced in rats placed on a high platform, which made them anxious. This was mirrored in their brain activity.
While the rodents responded to several parts of their body being tickled, tummy-tickling set them off the most.
The German team, led by Dr Michael Brecht from the Humboldt University of Berlin, wrote in the journal Science: "Rats vocalise during tickling in a mood-dependent fashion.
"The increase of vocalisations after initial tickling and anxiogenic (anxiety-inducing) suppression of tickling-evoked calls support Darwin's idea that 'the mind must be in a pleasurable condition' for ticklish laughter ..."
They added: "The numerous similarities between rat and human ticklishness, such as tickling-evoked vocalisations and anxiogenic modulation, suggest that tickling is a very old and conserved form of social physicality."
This article was written on behalf of helpucover. helpucover is a trading style of Pinnacle Insurance plc, an insurance company who offers Pet Insurance.
Copyright Press Association 2016