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:6/26/2016)... (PRWEB) , ... June 26, 2016 , ... PawPaws ... a new product that was developed to enhance the health of felines. The formula ... , The two main herbs in the PawPaws Cat Kidney Support Supplement ...
(Date:6/25/2016)... ... , ... The temporary closing of Bruton Memorial Library on June 21 due to a possible ... often overlooked aspect of head lice: the parasite’s ability to live away from a human ... but a necessary one in the event that lice have simply gotten out of control. ...
(Date:6/25/2016)... ... ... On Friday, June 10, Van Mitchell, Secretary of the Maryland Department of Health ... of their exemplary accomplishments in worksite health promotion. , The Wellness at Work Awards ... at the BWI Marriott in Linthicum Heights. iHire was one of 42 businesses to ...
(Date:6/24/2016)... ... June 24, 2016 , ... Marcy was in a crisis. Her son James, eight, was out ... family verbally and physically. , “When something upset him, he couldn’t control his emotions,” remembers ... would throw rocks at my other children and say he was going to kill them. ...
(Date:6/24/2016)... ... , ... Topical BioMedics, Inc, makers of Topricin and MyPainAway Pain Relief Products, join The ‘Business ... to $12 an hour by 2020 and then adjusting it yearly to increase at the ... minimum wage, assure the wage floor does not erode again, and make future increases more ...
Breaking Medicine News(10 mins):
(Date:6/24/2016)... 24, 2016  Consumers have taken a more ... placed more emphasis on patient outcomes. ... in the pharmaceutical industry have evolved beyond just ... companies are focusing on becoming more patient-oriented across ... and services that improve health. ...
(Date:6/24/2016)... 24, 2016   Bay Area Lyme Foundation ... Dean Center for Tick Borne Illness , Harvard ... MIT Hacking Medicine, University of California, Berkeley, and ... the five finalists of Lyme Innovation , ... than 100 scientists, clinicians, researchers, entrepreneurs, and investors ...
(Date:6/24/2016)... The Academy of Managed Care Pharmacy (AMCP) ... would allow biopharmaceutical companies to more easily share health ... and coverage decisions, a move that addresses the growing ... The recommendations address restrictions in the sharing of ... label, a prohibition that hinders decision makers from accessing ...
Breaking Medicine Technology: