The homogenetic school considers adaptation to be a conservative rather than progressive factor in evolution. The exchange is both necessary and irreversible. The fluctuations play a decisive role in the evolutionary progress. There were earlier attempts to conceive homogenization in terms of a series of deviation-amplifying processes. Dissipative structures mediating the contact between organism and the outside world, are present in animals ranging from reptiles to man.
Clinical evidence is available.
The determining factor in both phylogeny and ontogeny is group specificity. Heteromorph speciation defines the participation of the species in their own evolution. In man, brain size is determined by the mass of the neo-cortex. 1930 Embryology and Evolution, Oxford University Press Berg. Mass. Braak, H. 1980 Architectonics of the Human Telencephalon.