According to Robert Provine, professor of psychology at the University of Maryland Baltimore County, it’s no surprise if it does.
“Yawning is extraordinarily contagious,” says Provine, who has published much of what is known about the subject, particularly its behavioral aspects. “Seeing a person yawn triggers yawns. Reading about yawning causes yawns. Sitting alone in a room thinking about yawning triggers yawning.”
A brain mechanism, Provine explains, actually detects a yawning face, which then triggers that behavior. “Once the neurological machinery in our head gets underway,” he says, “it’s hard to stop a yawn.”
http://abcnews.go.com/onair/2020/2020_000712_contagiousbehavior_feature.html