The more ways the brain can approach a subject, the better it will grasp that subject. You can use this to your advantage when you work on pieces by doing what I call opposite practice, in which you take an aspect of your music and do the exact opposite of whatever is notated on the page. This will usually bring to light something you didn't notice before, either about what you're doing when you play or about the piece itself. Try it for yourself:
Here's a chart version of all these ideas (click the image for a downloadable version):
Come up with your own opposites! Don't limit yourself to just what's on the page when you practice your music. The most interesting musicians to listen to are the ones who innovate. Give your brain many chances and many ways to learn, and the payoff will be comfort and confidence onstage.