Can you read this without yawning?
chatted with Gallup about why yawning is ubiquitous—and useful. This interview has been edited for clarity and length. No. Despite continued belief, research has explicitly tested that hypothesis and the results have concluded that breathing and yawning are controlled by different mechanisms. For example, there are really interesting cases of yawning in marine mammals, where the yawning occurs while the animal is submerged underwater and therefore not breathing.
Q: One of the most curious things about yawning is that it can be contagious. Do all animals yawn contagiously? We’ve been talking about spontaneous yawns up to this point—those are internally, physiologically driven. Contagious yawns are elicited by seeing or hearing yawns in others, and [they] have only been documented in highly social species, humans included. There’s a wide variability in that response among individuals.
I conducted a study last year that tested this. We showed people arrays of images that included threatening stimuli—images of snakes—and nonthreatening stimuli—images of frogs—and timed how fast they could pick out those images after seeing videos of people yawning or moving their mouths in other ways. After seeing other people yawn, their ability to identify and detect snakes, the threatening stimuli, rapidly improved.
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