The frontal cortex even expands in size in this initial phase, as we focus hard on the task. But once something is repeated often enough, it becomes hardwired and automatic, and the neural pathways for this skill are delegated to other parts of the brain, farther down the cortex. Those neurons in the frontal cortex that we needed in the initial stages are now freed up to help in learning something else, and the area goes back to its normal size.
