Navigation Links
Yawning May Help the Brain Chill Out
Date:9/30/2011

FRIDAY, Sept. 30 (HealthDay News) -- Yawning may be a natural way of regulating brain temperature, a new study suggests.

U.S. researchers examined the frequency of yawns among 80 people in the winter and another 80 people in the summer and found seasonal variations.

Yawning is known to be "contagious," the researchers pointed out. After being showed pictures of other people yawning, nearly half of the participants yawned while outdoors in winter, compared with less than one-quarter while outdoors in summer, according to the report published online Sept. 22 in the journal Frontiers in Evolutionary Neuroscience.

The finding that people yawn less often in the summer, when outdoor temperatures often exceed body temperature, suggests that yawning could be a natural brain-cooling mechanism, said the researchers at Princeton University and the University of Arizona.

"This provides additional support for the view that the mechanisms controlling the expression of yawning are involved in thermoregulatory physiology. Despite numerous theories posited in the past few decades, very little experimental research has been done to uncover the biological function of yawning, and there is still no consensus about its purpose among the dozen or so researchers studying the topic today," study leader Andrew Gallup, a postdoctoral research associate in Princeton's department of ecology and evolutionary biology, said in a university news release.

"Enter the brain cooling, or thermoregulatory, hypothesis, which proposes that yawning is triggered by increases in brain temperature, and that the physiological consequences of a yawn act to promote brain cooling," he added.

Yawning may help cool the brain through the deep inhalation of cool air and by enhanced blood flow to the brain caused by the stretching of the jaw.

"According to the brain cooling hypothesis, it is the temperature of the ambient air that gives a yawn its utility. Thus yawning should be counterproductive -- and therefore suppressed -- in ambient temperatures at or exceeding body temperature because taking a deep inhalation of air would not promote cooling. In other words, there should be a 'thermal window' or a relatively narrow range of ambient temperatures in which to expect highest rates of yawning," Gallup explained.

More information

Neuroscience for Kids has more about yawning.

-- Robert Preidt

SOURCE: Princeton University, news release, September 2011


'/>"/>
Copyright©2010 ScoutNews,LLC.
All rights reserved

Related medicine news :

1. More than a sign of sleepiness, yawning may cool the brain
2. Brain Continues to Develop Beyond Adolescence
3. Stanford brain imaging study shows physiological basis of dyslexia
4. Louisiana State University Health Sciences Center research discovers key to survival of brain cells
5. How normal cells become brain cancers
6. New modeling of brains circuitry may bring better understanding of Parkinsons disease
7. Could Too Little Vitamin B-12 Shrink the Aging Brain?
8. Could targeting a virus treat a common pediatric brain tumor?
9. Some brain wiring continues to develop well into our 20s: U of A study
10. The disinhibited brain
11. Buyer beware: Advertising may seduce your brain, UCLA researchers say
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/25/2016)... ... June 25, 2016 , ... ... issues and applications at AcademyHealth’s Annual Research Meeting June 26-28, 2016, at the ... several important health care topics including advance care planning, healthcare costs and patient ...
(Date:6/25/2016)... ... June 25, 2016 , ... As a lifelong Southern Californian, Dr. Omkar Marathe ... from the David Geffen School of Medicine at UCLA. He trained in Internal Medicine ... his fellowship in hematology/oncology at the UCLA-Olive View-Cedars Sinai program where he had the ...
(Date:6/24/2016)... ... ... Those who have experienced traumatic events may suffer from a complex set of ... or alcohol abuse, as a coping mechanism. To avoid this pain and suffering, Serenity ... event. , Trauma sufferers tend to feel a range of emotions, from depression, guilt, ...
(Date:6/24/2016)... (PRWEB) , ... June 24, 2016 , ... ... now offering micro-osteoperforation for accelerated orthodontic treatment. Dr. Cheng has extensive experience with ... Damon brackets , AcceleDent, and accelerated osteogenic orthodontics. , Micro-osteoperforation is a ...
(Date:6/24/2016)... ... June 24, 2016 , ... The Haute Beauty Network, ... M. Weintraub as a prominent plastic surgeon and the network’s newest partner. ... the most handsome men, look naturally attractive. Plastic surgery should be invisible.” He ...
Breaking Medicine News(10 mins):
(Date:6/23/2016)... , June 23, 2016 , ... on Thursday, July 7, 2016 , , , , LOCATION: ... , , , , EXPERT PANELISTS:  , , , ... Senior Industry Analyst, Christi Bird; Senior Industry Analyst, Divyaa Ravishankar and ... The global pharmaceutical industry is witnessing an exceptional era. ...
(Date:6/23/2016)...  Guerbet announced today that it has been named ... . One of 12 suppliers to receive ... support of Premier members through exceptional local customer service ... to lower costs. ... outstanding customer service from Premier," says Massimo Carrara ...
(Date:6/23/2016)... NEW YORK , June 23, 2016 ... rough waters, but it continues to present great opportunities ... featured companies for today: Intrexon Corp. (NYSE: ... ), Arena Pharmaceuticals Inc. (NASDAQ: ARNA ), ... Learn more about these stocks and receive your complimentary ...
Breaking Medicine Technology: