While previous studies have suggested a connection between contagious yawning and empathy, new research finds that contagious yawning may decrease with age and is not strongly related to variables like empathy, tiredness and energy levels. Contagious yawning is a well-documented phenomenon that occurs only in humans and chimpanzees in response to hearing, seeing or thinking about yawning.
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/f...
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/f...