Do we yawn to cool our brains?
The phenomenon of contagious yawning has been analyzed by researchers for many years. Though many believe yawning increases oxygen supply to the brain, researchers publishing in Physiology & Behavior have concluded that the purpose of yawning is to cool the brain.
The team, led by Andrew Gallup of SUNY College at Oneonta, NY, notes that previous research into the subject has not been able to produce a link between yawning and blood oxygen levels.
