I always felt that the human brain has some kind of maximum capacity and you can trade one skill for another (even across major domains like logic and social sk

I always felt that the human brain has some kind of maximum capacity and you can trade one skill for another (even across major domains like logic and social skills) and that brain structure / skills are mostly defined by your actions early in life. Genetics sure play a huge role here and there are countless abnormalities that are known to change the brain and mind, but I think that the development is what defines your strengths and weaknesses. Unfortunately we can't proof if the brain structure you end up with was mostly caused by your actions, or if your development progressed the way it did because your brain is just built that way.