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Merely thinking about or seeing someone yawning can make you yawn. But why?
Wondering why you always yawn when other people do? Catch your dog yawning at the same time? Find out why the tired reflex is so contagious.
In a new study, researchers from the University of Nottingham looked at the brain to determine what makes yawning contagious. The BBC reports it happens in the part of the brain that controls ...
A yawn is a reflex in vertebrate animals characterized by a long inspiratory phase with gradual mouth gaping, followed by a brief climax (or acme) with muscle stretching, and a rapid expiratory phase with muscle relaxation, which typically lasts a few seconds.
[1] [2] For fsh and birds, this is described as gradual mouth gaping, staying open for at least 3 s and subsequently a rapid closure of the mouth. [3] This is a more accurate defenition of a yawn and animals that perform yawning. Stretching the eardrums is only a small part of the yawn and refers to one specific hypothesis (middle ear clearing).
During faucalized voice, the sides of pharynx expand outward and the larynx descends and tilts forward. The term "yawny voice" is appropriate to compare this voice quality to the physiological act of yawning. Its opposite is harsh voice, a vocal quality produced when the pharynx is contracted and the larynx raised.
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