Manipulating neck temperature can reduce contagious yawning in humans, finds a new study, providing more evidence that yawns function as a brain cooling mechanism. According to the brain cooling hypothesis, yawns are triggered by rises in cranial temperature.

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Manipulating neck temperature can reduce contagious yawning in humans, finds a new study, providing more evidence that yawns function as a brain cooling mechanism. According to the brain cooling hypothesis, yawns are triggered by rises in cranial temperature.