Another theory claims that contagious yawning is a primitive form of unconscious communication and bonding that helped our ancestors stay safe and avoid danger long ago, far before smoke signals and Skype. A study demonstrated that the number of times small parrots yawn contagiously increases when the temperature increases. In the study, 16 birds were exposed to four minute periods of changing temperatures, and their yawning was found to positively correlate with ambient temperatures during the trial.
This behavior, the researchers think, might serve as a warning sign to others of potential threats. Studies show that the younger you are, the more likely you are to catch yawns off your co-workers. More research is needed, but the study authors speculate that people may generally become less susceptible to contagious yawning as they age, possibly because they pay less attention to the behavior in others. Write to Kate Samuelson at kate. Learn about how to safely stretch your ears and the materials you'll….
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