ahoffmann,
Interesting idea, but what are your own conclusions based on this footage?
Another thought: did you record your own playing with the intention of analyzing differences (or non-differences) in movement? Don't you think it would the experiment would yield more if you asked a number of other people (professional pianists of course) to play scales, broken chords etc in varying tempos, without telling them what you are looking for?
When I first thought of doing this I was just trying to see what I and many others have been assuming for a long time - namely that the movement becomes quite different as it gets faster. Like the difference between running and walking. That's relevant for people learning but also for fingering decisions when you're learning repertoire.
As I say in the video, I was surprised that it wasn't more different.
Sure ideally it would be most interesting to compare various pianists. In particular I think the difference between beginners and advanced pianists might be interesting.
Also this might be an interesting way to look at why things aren't working well. Or perhaps compare a piece that I've just started learning and what it looks like afterwards.
You've given me some interesting ideas. Thanks!
Topic: Slow Motion Video of Fast Passages