Yawning


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Yawning

 

a unique involuntary respiratory movement that consists of a deep, lingering inhalation, during which the mouth, pharynx, and glottis open wide, followed by a rapid, energetic exhalation. An unconditioned reflex adaptive act, yawning is only found in mammals and is directed at improving the oxygen supply to organs when there is an accumulation of CO., in the blood. It occurs when there is fatigue, a prolonged stay in stuffy smoky premises, muscular inactivity, or drowsiness. It arises readily as an imitative act (infectiousness of yawning). Prolonged, painful, or spasmodic yawning may be a symptom of oxygen starvation of the brain (for example, during heavy blood loss) or other pathological conditions that require immediate medical attention.

References in periodicals archive ?
"Sarfaraz yawning shows his enthusiasm for the match..#PAKvsIND," one Twitter user posted.
To that end, there's now a specially designed yawning susceptibility scale to measure exactly how prone someone is to "catching" a yawn.
In another experiment, the participants were given the same instructions; however, the researchers also applied electrical currents to the people's scalps, which were meant to stimulate the motor cortex, the part of the brain that controls yawning. Telling the participants to stifle their yawns only increased their urge to yawn, the researchers found. 
Drug-induced yawning: a review of the French pharmacovigilance database.
In the study 328 participants were shown a three-minute video showing other people yawning. Each subject had to click a button every time they yawned.
Contagious yawning occurs not only in humans, but also in chimpanzees and other animals, in response to hearing about, seeing or thinking about yawning.
Romero in the university's Department of Cognitive and Behavioral Sciences explains further: "Although our study cannot determine the exact underlying mechanism operative in dogs, the subjects' physiological measures taken during the study allowed us to counter the alternative hypothesis of yawning as a distress response."
Another theory, of course, is that yawning seems to be contagious.
She said: "The results of this study demonstrate that yawning can be observed in healthy foetuses and extends previous work on foetal yawning.
ySTANBUL (CyHAN)- A recent study published in the journal Plos One on Wednesday suggests that fetal yawning is not simply a mouth opening.
If you see someone yawning, there's a good chance you will often yawn too.
Scientists found that yawning contagion increased according to how strong the bonds between people were.