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Why Do We Yawn?
"Brains are like computers," Andrew Gallup, a researcher in the Department of Biology at Binghamton University who led the study, told Discovery News. "They operate most efficiently when cool, and physical adaptations have evolved to allow maximum cooling of the brain," he added.
For their study, the expert along with colleagues Michael Miller and Anne Clark, used Parakeets as these birds have larger brains and are subjected to frequent temperature changes in the wilderness of Australia. Most importantly the Parakeets do not engage in contagious yawning, as humans and some other animals do.
According to Gallup, contagious yawning is thought to be an evolved mechanism for keeping groups alert so they "remain vigilant against danger."
At the course of study the Parakket were exposed to three different temperatures, increasing temperature, high temperature and a moderate control temperature.
The frequency of yawn doubled over with the increase in temperature, "Based on the brain cooling hypothesis, we suggest that there should be a thermal window in which yawning should occur," Gallup said.
"For instance, yawning should not occur when ambient temperatures exceed body temperature, as taking a deep inhalation of warm air would be counterproductive. In addition, yawning when it is extremely cold may be maladaptive, as this may send unusually cold air to the brain, which may produce a thermal shock," the expert said. The parakeets yawned as predicted.
It is now concluded that yawning cools the brains and works as a radiator in birds and mammals.
Disclaimer: The information provided in this article is for general informational and educational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or a qualified healthcare provider with any questions you may have regarding a medical condition.
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