The first is the granular prefrontal cortex (gPFC), which was a new addition to the frontal cortex.* This newer granular prefrontal cortex wraps around the much older agranular prefrontal cortex (aPFC). The second new area of neocortex, which I will call the primate sensory cortex (PSC), is an amalgamation of several new areas of sensory cortex that emerged in primates.* The gPFC and PSC are extremely interconnected with each other, making up their own new network of frontal and sensory neocortical regions.
