A 5-fold Increase

The regions most active were those involved in controlling movement and representing sequences. And the more often the brain repeated the sequence, the faster the subject improved. When the participants were beginning to learn the skill, they were initially typing about five to six repetitions of the sequence during each 10 seconds of practice. But during rest, the brain replayed about 25 repetitions of the sequence, and that’s a fivefold increase over the same amount of time.