Practice - getting it more effective
We’ve all been there, trying to get a tricky bit in a tune to work properly, or learn an important bit of technique, and it can so often be a long, hard slog. So, what’s happening? You practice that tricky bit or technique a dozen times in quick succession and then get it right. But you don’t really know why, so you try it again and it goes all wrong. Back to square one and another dozen reps before you get it right again. Eventually, after perhaps half an hour, or even hours, what you hope is permanent success is achieved, but you may not be quite sure what it is you have done right.
This phenomenon applies to the learning of any difficult motor skill and has been addressed by the music/sports psychologist Dr Noa Kageyama. Briefly, the root of the problem turns out to be in going from one rep to the next with no appreciable gap. Tests have been carried out on the learning of difficult motor skills and it has been established that if there is a pause of a few seconds between one rep and the next (say five seconds, at least - but one second is certainly too short) then that gives you a chance to think about the difficulty and for your brain to process it subconciously, thereby speeding up the learning process.
The full detail is in Kageyama’s blog http://www.bulletproofmusician.com/for-more-perfect-practice-trylongerpauses/
I recommend subscribing to Dr Kageyama’s blogs.