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the claim

Yawning helps regulate brain temperature by cooling the brain.

the verdict
INSUFFICIENT LEANING
Recorded sources
3 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 Yawning helps regulate brain temperature by cooling the brain?

Unclear. Three peer-reviewed items treat yawning as thermoregulatory: two experiments link breathing and forehead temperature to contagious yawning, and two reviews describe the brain-cooling hypothesis as influential but still a hypothesis with unexplained cases such as fetal yawning. None measures brain temperature directly, so the evidence supports only a partial version of the claim.

Verdict: PARTIAL LEAN · 3 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 · 3
Yawning as a Brain Cooling Mechanism: Nasal Breathing and Forehead Cooling Diminish the Incidence of Contagious Yawning
2007
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Gallup, A. C. & Gallup, G. G. (2007). Yawning as a Brain Cooling Mechanism: Nasal Breathing and Forehead Cooling Diminish the Incidence of Contagious Yawning. doi.org. https://doi.org/10.1177/147470490700500109

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More for · 2
Fetal yawning and mouth openings: Frequency, developmental trends, and association with birth weight.
2026
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D, M., P, V., MT, G., H, O., & M, D. (2026). Fetal yawning and mouth openings: Frequency, developmental trends, and association with birth weight.. doi.org. https://doi.org/10.1371/journal.pone.0341339

The science of yawning: Exploring its physiology, evolutionary role, and behavioral impact.
2025
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PD, W. & M, A. (2025). The science of yawning: Exploring its physiology, evolutionary role, and behavioral impact.. doi.org. https://doi.org/10.4103/jfmpc.jfmpc_1677_24

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