These mental pathways are her filter. They produce the recurring pattern of behaviors that makes her unique. They tell her which stimuli to respond to and which to ignore. They define where she will excel and where she will struggle. They create all of her enthusiasms and all of her indifferences. The carving of these pathways is the carving of her character. Neuroscience is telling us that beyond her mid-teens, there is a limit to how much of her character she can recarve.
