The reptilian brain evolution appeared 300 million years ago. It is a more instinctive brain is based mainly on survival.
It controls bodily functions such as hunger, digestion and elimination, respiration, circulation, temperature, territorial instincts and the instinct of flight and fight (as you see, a whole pack of “accessories” to preserve the lives and safety of oneself).
You could say that part of the brain is more work when a baby is born. His main concern is to ensure food, heat and generally maintain vital signs and optimal wellness.
At the time some of this lack or failure, claims the baby, because that is what you need to stay alive.
This part of the brain is virtually identical to the chimpanzee brain. It is also called the emotional brain, as it is responsible for generating emotions or rational human brain has to learn to control.
