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Living creatures evolve, and this evolution allows them to adapt to an ever-changing milieu. Two main adaptive strategies coexist. The first involves genetic mutations taking place at the species level. The second strategy occurs at the individual level, and primarily involves changes in chromatin organization and brain circuits. We shall illustrate how the two modes of adaptation are interdependent, and will show the difference in their respective importance depending on the species. It will be proposed that changes in developmental strategies, genetically selected, can lead to more or less epigenetic freedom, sometimes with dramatic consequences. In particular it will be shown, taking chimpanzees and humans as examples, how minor genetic modifications can translate into nonlinear changes in brain structure and cultural practices, placing the two types of primates at a much greater distance than had been anticipated.

Evolution of the nervous system: a critical evaluation of how genetic changes translate into morphological changes