Once a certain skill is fully internalized, using it may require no attention at all. It's similar to growing a coprocessor designed to do this task, load on C

Once a certain skill is fully internalized, using it may require no attention at all. It's similar to growing a coprocessor designed to do this task, load on CPU is reduced and you may also get a small cache to buffer it for a while without losing context even if interrupted. It has limitations, too complex tasks are hard for brain to make automatically facile.