If you want a detailed argument see Chapter 2 of Pierre Gloor's "The Temporal Lobe and Limbic System" where he argues against the (unfortunately still common) p

If you want a detailed argument see Chapter 2 of Pierre Gloor's "The Temporal Lobe and Limbic System" where he argues against the (unfortunately still common) paleo/archi/neocortex terminology in favor if the allo/meso/isocortex terminology in the context of describing comparative anatomy. It is out of print but the Internet Archive has it available to borrow: https://archive.org/details/temporallobelimb0000gloo/mode/2up https://archive.org/details/temporallobelimb0000gloo/mode/2u... Your "isn't it true" paragraph is all incorrect (unless it is considered in a uselessly general way). For instance, Gloor notes that all mammals have an isocortex (that seems to have started in olfactory cortex). The "reptiles" that humans evolved from is just a catch all terminology for a diverse group of life and not closely related to current reptiles. He starts the chapter noting that ancestral brains are not available for direct study.