Why shake head left and right when disagree

Although the nod means "yes" with a staggering act means "no," it is not the custom accepted worldwide. It is a popular and understood in many, many biologists agree with the proposal of Charles Darwin described the cause of action such as this. Is an addictive behavior since the last time an infant. Due to the nature of the nod ahead of a motion to baby while breast feeding prevalence. The shake was a gesture showing the decline of the baby as well. And the nature of this rejection Even more so when the toddler was still in use, such as if a child refuses food or feed it to children, parents, extended it to shake negativity food.

         "lrenäus Eibl-Eibersfeldt" Biologists social explained that agreed by the nod may primarily associated with asymptomatic accepted or surrendering the ideas of others are staggering, it might come from the flick (hair, body) of a bird or animal. Mammals We reject the idea that we do not agree in the same way when wet dog hair flick.

         However, the proof that Deaf children Born blind You can nod and shook his head without a sample to see it. Supports the idea that Beck shook his head and face caused due to the behavior of the baby. Non-cultivated culturally.