" This brings into play what might be called a cognitive system, associated with the habitual system, and an effort system, associated with the hippocampus (situated at the base of the brain). The cognitive and effort systems become subsets of the habitual system long enough to modify it, to teach it a new behavior. To put it another way, the cognitive and effort systems “click into” the habitual system and reprogram it. When the job is done, both systems withdraw. Then you don’t have to stop and think about, say, the right grip every time you shift your racket. "

― George Leonard , Mastery: The Keys to Success and Long-Term Fulfillment