But we only can know the yellow. I wouldn’t be surprised if the blue line had a positive slope over a ten thousand year scale. We are less and less fit for the environment we make.
Or, there’s just no such thing as “typical” within an organ as complex as the human brain. There is only social contexts in which some brains thrive and others struggle… combined with the innate human instinct to form in groups and out groups.
But we only can know the yellow. I wouldn’t be surprised if the blue line had a positive slope over a ten thousand year scale. We are less and less fit for the environment we make.
Or, there’s just no such thing as “typical” within an organ as complex as the human brain. There is only social contexts in which some brains thrive and others struggle… combined with the innate human instinct to form in groups and out groups.