 The Proisocortex is transitional between both the true isocotex and periallocortex, it can be found mainly in the cingulate gyrus, insula and the subcallosal areas of the brain.The true isocortex is a six layered cytoarchitecture that is predominately located in the frontal lobe, parietal lobe, temporal lobe and occipital lobe.Another unique feature of the neocortex is the way in which the matter is arranged together in columns.