Survival value in evolution

It is often argued that if nature took the trouble to create the cortex in a certain way, it must have a value for the survival of the species. However, "survival value" does not necessarily imply better functioning in the adult years. Instead, it may mean a better chance for environmental adaptation at an early age, or a more efficient use of the genetic code that is required for the growth of the cortex in the embryo.

-- M. Abeles, Corticonics, p. 40