ఆవులింత: కూర్పుల మధ్య తేడాలు
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Rajasekhar1961 (చర్చ | రచనలు) కొత్త పేజీ: '''ఆవులింత''' నిద్ర వచ్చేముందు వచ్చేవి. en:Yawning |
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పంక్తి 1:
'''ఆవులింత''' (Yawn) [[నిద్ర]] వచ్చేముందు వచ్చేవి.
[[Image:Ducreuxyawn.jpg|thumb|200px|right|[[Joseph Ducreux]] pandiculating; self-portrait ca 1783]]
A '''yawn''' (from the [[Middle English]] ''yanen'', an alteration of ''yonen'' or ''yenen'', which in turn comes from the [[Old English language|Old English]] ''geonian''<ref>{{Cite web|url=http://www.etymonline.com/index.php?term=yawn |title=Online Etymology Dictionary |accessdate=2007-07-24}}</ref>), is a [[reflex]] of simultaneous inhalation of air and stretching of the eardrums, followed by exhalation of breath. ''Pandiculation'' is the term for the act of stretching and yawning simultaneously.<ref name=pandiculate>[http://www.medterms.com/script/main/art.asp?articlekey=4752 MedOnline.net term] pandiculate</ref>
Yawning is also associated with [[tiredness]], [[stress (psychology)|stress]], overwork, lack of stimulation, or [[boredom]]. Yawning can also be a powerful non-verbal message with several possible meanings, depending on the circumstances. In humans, yawning has an infectious quality, i.e. seeing a person yawning, or just thinking of yawning, can trigger yawning which is a typical example of [[positive feedback]].<ref>Camazine, Deneubourg, Franks, Sneyd, Theraulaz, Bonabeau, ''Self-Organization in Biological Systems'', [[Princeton University Press]], 2003. ISBN 0-691-11624-5, ISBN 0-691-01211-3 (pbk.) p. 18.</ref> Infectious yawning has also been noted in chimpanzees.
The primary reason behind yawning is to control brain temperature. Yawning cools off your brain, much like a fan cools off the inside of a computer.<ref>{{Cite web|url=http://dsc.discovery.com/news/2008/12/15/yawn-brain-head.html |title=Discovery News |accessdate=2008-12-15}}</ref> The claim that yawning is caused by lack of oxygen has not been substantiated scientifically.<ref name=Provine2005>{{cite journal |title=Yawning |author=Provine RR |journal=American Scientist |year=2005 |volume=93 |issue=6 |pages=532 |doi=10.1511/2005.6.532 |url=http://www.americanscientist.org/template/AssetDetail/assetid/47361}}</ref> Some claim that yawning is not caused by lack of oxygen, for the reason that yawning allegedly reduces oxygen intake compared to normal respiration.<ref name=Provine2005 /> Another speculated reason for yawning is nervousness and is also claimed to help increase the state of alertness of a person—paratroopers have been noted to yawn in the moments before they exit the aircraft.<ref>[http://www.newscientist.com/article/mg19426104.400-yawning-may-boost-brains-alertness.html New Scientist]</ref>
==మూలాలు==
{{మూలాలజాబితా}}
[[en:Yawning]]
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