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the claim

Rats emit ultrasonic vocalizations resembling laughter when they are tickled.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
6 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that rats emit ultrasonic vocalizations resembling laughter when they are tickled?

Yes. A reference article and a seminal paper report that tickling rats elicits 50-kHz ultrasonic calls described as laughter-like chirping, and a 2014 study likewise links tickling to 50-kHz calls proposed to index joy akin to laughter. Several reviews confirm 50-kHz calls express positive affect but do not themselves address tickling or laughter.

Verdict: SUPPORTED · 6 sources for, 0 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 6
Laughter in animals
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Laughter in animals. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Laughter_in_animals

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More for · 5
Ethotransmission: communication of emotional states through ultrasonic vocalization in rats.
2013
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Brudzynski, S. M. (2013). Ethotransmission: communication of emotional states through ultrasonic vocalization in rats.. doi.org. https://doi.org/10.1016/j.conb.2013.01.014

Inhibition of the glucocorticoid synthesis reverses stress-induced decrease in rat's 50-kHz ultrasonic vocalizations.
2014
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Popik, P., Kos, T., Pluta, H., Nikiforuk, A., Rojek, K., & Ryguła, R. (2014). Inhibition of the glucocorticoid synthesis reverses stress-induced decrease in rat's 50-kHz ultrasonic vocalizations.. doi.org. https://doi.org/10.1016/j.bbr.2013.11.029

Laughing Rats? Playful Tickling Arouses High-Frequency Ultrasonic Chirping in Young Rodents
2010
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Jaak, P. & Jeffrey, B. (2010). Laughing Rats? Playful Tickling Arouses High-Frequency Ultrasonic Chirping in Young Rodents. eric.ed.gov. https://eric.ed.gov/?id=EJ1069218

Ultrasonic vocalizations as a tool in studying emotional states in rodent models of social behavior and brain disease
2018
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Ultrasonic vocalizations as a tool in studying emotional states in rodent models of social behavior and brain disease. (2018). hal.science. https://doi.org/10.1016/j.neuropharm.2018.11.008

Mouse and rat ultrasonic vocalizations in neuroscience and neuropharmacology: State of the art and future applications
2023
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Mouse and rat ultrasonic vocalizations in neuroscience and neuropharmacology: State of the art and future applications. (2023). hal.science. https://doi.org/10.1111/ejn.15957

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