A mouse temporarily scratches when injected with a substance to cause itching. But mice that can't make serotonin don't scratch as much as their litter mates that do make it.

I don't know if it was due to watching that mouse scratch, but my head was itchy nearing the end of the video and required scratching. I'm usually able to suppress contagious yawns, though. I read ...

When researchers showed a mouse a video of another mouse scratching, the live mouse began scratching, too. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted ...