Rats laugh when tickled and play with one another, and we now know which part of their brain helps them do both.
were active during tickling, researchers hoped they could pinpoint regions of the brain that drives laughter and playfulness.
First, Brecht and his colleagues let the rats settle into their homes in the lab for a few days, as stressed rodents are less likely to laugh whentheir hands and tickled them on their backs and bellies while recording their vocalisations. They also allowed pairs of rats to play and socialise with each other and made similar recordings. During the play and tickling, the rats were free to move around their enclosure while researchers observed their brain cell activity with implanted electrodes.
The imaging revealed that an area of the midbrain called the periaqueductal grey was particularly active during
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