I've always called it "motor memory"
Had a great example two nights ago in Aikido class.
Sensei set up a randori. The "big guys" were called onto the floor. And then I was, too, and told I was "up".
I have since heard I did rather well. I do not remember a bit of it. Motor Memory the whole way.
Edited by iaibear (02/01/12 10:21 AM)
Edit Reason: needed an example