Bournemouth University neuropsychologist Simon Thompson is an expert on yawning. In 2011, he posited that high levels of the stress hormone cortisol may be a direct cause of yawning. “We believe that ...

If you see or hear someone yawn, you might suddenly feel the urge ... So, Onishi decided to conduct an experiment to learn more. She and her colleagues recorded the sanctuary’s 20 chimpanzees ...