We use a muscle it grows. Right??
We stop using it it gets weaker.. over generation a body part can even disappear.
How come we have brain which is underused?? Ppl say that most used brain is like 7% or some thing.
So were we so smart at some point in the history that we still have such left over brains?? Does some one else finds it stranage??
Disuse atrophy doesnt sets in mature stable cells like neurons . neither do they multiply. They are programmed to exit cycle in G o phase never to re-enter for the rest of primal life