There seem to have been some adaptations including central nervous system genes, which may have increased fitness in a hierarchical agricultural society. For e

There seem to have been some adaptations including central nervous system genes, which may have increased fitness in a hierarchical agricultural society. For example new versions of serotonin transporters in both Europe and east Asia (such as SLC6A4). There are other neurotransmitter-related changes, also changes in genes that affect brain development. East Asians have a new version of DAB1, a gene involved in the development of the layers of the cerebral cortex, while there is a fairly common new version of NKX2-2 (a brain homeobox gene) in Europeans. http://biology.plosjournals.org/perlserv/?request=get-document&doi=10.1371% http://biology.plosjournals.org/perlserv/?request=get-docume... http://www.plosgenetics.org/article/info:doi/10.1371/journal.pgen.0030090 http://www.plosgenetics.org/article/info:doi/10.1371/journal...