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This is Scientific American's 60- Second Science. I'm Lucy Wong.

Mice and rats vocalize.

To us, many of the sounds they make are ultrasonic, at too higher frequency to hear.

But if we slow the calls down, they sound like squeaks.

And not all squeaks are the same.

The sounds that rodents make when they're excited versus

disappointed can be quite different. For example, here's slow down audio of a rat drinking sugar water.

But this rat got played.

It got non-sweetened water after becoming accustomed to sugar water.

Calls around 22 kilohertz are usually associated with unhappy affect.

And calls around 55 kilohertz are happy affect.

John Neumeier, a professor of psychiatry and pharmacology at the University of Washington.

If you tickle a rat, it puts out a lot of 55 calls.

If we give them a sucrose solution, then they put out a lot of calls of 55 kilohertz.

Being able to interpret these different calls can help researchers understand the rodent's emotional state,

which could affect the results of the experiments on the animals. Of course, listening to rodents in real

time eats up resources. To code one hour of a recording, it takes 10 hours, you know, because you have to

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