New research reveals why is yawning so contagious

Why is yawning so contagious? New research found it triggers an automatic response in a primitive part of our brain.

Scientists from the University of Nottingham say understanding contagious yawning could also help understand other conditions like Tourette’s.

Video journalist Sofia Bettiza explains.

Article source: http://www.bbc.co.uk/news/health-41116156

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