 In the human brain, the six neocortex layers are 2.5mm thick which contain thousands of different types of cells.Neuroscientists over the many years of research have struggled greatly to reach an agreed conclusion as to why the Neocortex is arranged in such a way; however, many suggest that the columns act as channels for intricate communication between cells and differing layers, this is believed to be another neurological explanation as to why higher order mammals have such a complex order of thinking in comparison to lower-order mammals, reptiles and birds.The neomammalian brain (neocortex) is the newest addition to the Human Brain.