Children under 4 and children with autism don't yawn contagiously

If someone near you yawns, do you yawn, too? About half of adults yawn after someone else does in a phenomenon called contagious yawning. Now a new study has found that most children aren't susceptible to contagious yawning until they're about 4 years old -and that children with autism are less likely to yawn contagiously than others.

Read the whole article on Physorg

More from Physorg