The brain doesn't want to waste so much time and energy learning how to write as efficiently with my right hand as I do with my left. So the brain goes, you know what? You writing with your right hand, I'm going to throw it to a specific part in the left-hand side of your brain that could just deal with writing. But because it's established this network and refined it, it's kind of gone. This is it now. I'm leaving it just to this kind of network patterning... Not necessarily turned off, but they become less active.