If you scratch a rat, they will also giggle.

do you know? When the rat (Rats) is in the right mood, scratch their belly and they will laugh as happily as humans do. It's just that the sound is 50kHz ultrasound and can't be heard directly by human ears.

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for rats, the sound in this band does represent positive emotions, and the rats happily chase and play with the researchers' hands after being scratched.

A rat who is happily scratched will actively chase people's hands:

the following is a complete introduction video:

these videos and findings come from a cute study some time ago. Scientists tickled the belly and back of rats, recording their "laughter", behavior and changes in their brains.

Why scratch rats? The answer is to look for the biological mechanism behind the phenomenon of tickling and laughing. Being tickled and laughed by a companion is not a simple phenomenon. It is not only caused by the itchy feeling, but also has a lot to do with the social connection between individuals. It belongs to a kind of "social behavior". Rats can be scratched and laughed like humans, and it is convenient for laboratory observation.

through the study of rats, people have found some neurons closely related to the phenomenon of tickling and laughing (as shown below)

. At the same time, it is also found that in order for rats to enjoy tickling, they also need to have a good emotional state, which is obviously suppressed under anxiety.

if you usually come into contact with experimental rats, it is still not recommended to deliberately scratch them after reading this article. After all, it is difficult to judge how they feel. Be careful of being bitten _ (: bite) _

Ah, but the rats who have been scratched feel so cute ~