This is why yawning is contagious
It is because the human propensity for contagious yawning is triggered automatically by primitive reflexes in a brain area responsible for motor function.
Sep 01, 2017, 14:23 PM IST
It is because the human propensity for contagious yawning is triggered automatically by primitive reflexes in a brain area responsible for motor function.
Sep 01, 2017, 14:23 PM IST