Editing Neocortex (section)

==Neocortex ratio==
The neocortex ratio of a species is the ratio of the size of the neocortex to the rest of the brain. A high neocortex ratio is thought to correlate with a number of social variables such as [[Dunbar's number|group size]] and the complexity of social mating behaviors.<ref>{{cite journal |doi=10.1006/jhev.1995.1021 |title=Neocortex size and group size in primates: A test of the hypothesis |year=1995 | vauthors = Dunbar RI |journal=Journal of Human Evolution |volume=28 |issue=3 |pages=287–96}}</ref> Humans have a large neocortex as a percentage of total brain matter when compared with other mammals. For example, there is only a 30:1 ratio of neocortical gray matter to the size of the [[medulla oblongata]] in the brainstem of chimpanzees, while the ratio is 60:1 in humans.<ref>{{cite journal | vauthors = Semendeferi K, Lu A, Schenker N, Damasio H | title = Humans and great apes share a large frontal cortex | journal = Nature Neuroscience | volume = 5 | issue = 3 | pages = 272–6 | date = March 2002 | pmid = 11850633 | doi = 10.1038/nn814 | s2cid = 5921065 }}</ref>