Josephine There are so many musical decisions you make while learning a piece, a lot of small ones too, like playing a specific note of the melody a millisecond after the bassnote for instance. How on earth do you remember all of those choices?
This is a fascinating question, and I think I have a different answer that might provide food for thought.
I find that once my interpretation "makes sense", it almost feels so "obvious" that it's hard to imagine it another way. So that doing it another way seems like more "effort" than doing it the original way. It's like a ball rolling down a hill following a certain trajectory, it goes along the path with a certain velocity according to gravity, and you feel it instinctively to the point where you don't think about it. That's what I find I usually use to remember details of my playing. I wonder if that makes sense, and if others can relate.