The human brain is like a lump of ice cubes topped three overlapping. The first part is The lizard brain or brain stem The brain is the oldest. The behavior instinct transmitted by genes. An important function is to survive. Control of the body that carries out the mental consciousness such as breathing and heartbeat. Blood flow to the tissues of the brain's default mode of intuition to make decisions. The action is the habits and behaviors that will not. The brain has evolved to add the two up the area surrounding the brain or brain stem Limbic system is mammalian milk. The mood in the brain There are both positive emotions and negative emotions such as fear. And the third part of the latter is the Neocortex or the human brain is the cerebral cortex, the front part Prefrontal Cortex (PFC), a brain region critical thinking, reasoning, planning to target awareness restraint and emotional control. The brain is the control section below.