ADM is "process of knowing where to move the fingers on the fingerboard before actually moving them". So it has a big name but refers to a pretty common-sense idea - know where you are going before you make the "step". When you watch videos of concert guitarists, notice how they look ahead to the place of the next shift a fraction of a second before the shift actually happens - that's the "tell" and the tool of doing "ADM".
Sympathetic motion probably refers to the phenomenon of when you move a right hand finger, the neighbour kind of wants to go along - especially noticeable with moving "a" finger and the pinky moving as well. I think Shearer makes it a lot more complicated and applicable to (sequential) planting etc. but I am not convinced that it is actually an indispensable or even helpful concept in that expanded scope.
Last edited by guitarrista on Wed Jan 17, 2018 6:23 am, edited 1 time in total.
1982 Anselmo Solar Gonzalez