Literacy may have stolen brain power from other functions
The human brain contains many regions that are specialized for processing specific decisions and sensory inputs. Many of these are shared with our fellow mammals (and, in some cases, all vertebrates), suggesting that they are evolutionarily ancient specializations. But innovations like writing have only been around for a few thousand years, a time span that's too short relative to human generations to allow for this sort of large evolutionary change. In the absence of specialized capabilities, how has it become possible for such large portions of the population to become literate?
