10 years ago by
A Pianist
Interosseous for the extension of the proximal and distal joints and the lumbricals to flex the fingers at the MCP (hand bridge) joints. This is the only way of moving the finger that gives real independence because there are no opposing muscle groups involved.
(the last couple of paragraphs on that page give the correct explanation)
Strictly speaking, you don't need strength to make this movement if your fingers are well-prepped against the key, resting with just enough weight of the hand/arm to keep the fingers down but not press the key yet). At speed, there is probably a sleight arm weight pressure involved to keep the wheels on the road. Also, at speed, grouping becomes more important (one arm movement "creates" 3-4 finger movements).
I have noticed that training this movement with the help of a clothespin (heavier than a key) works wonders.
I have also noticed that the THUMB may interfere at speed in finger passages. My default principle for the thumb in finger technique is now that it should NEVER touch the key when it is not playing. Instead, I simply let it dangle somewhere along the keyboard edge until it is time to play a note. If I have to play deep into the black keys, the thumb hangs just over the keys, but it doesn't touch them until it has to play its note. Believe it or not, but students who used to suffer from wrist pain on the pinky side report that the pain goes away by doing this and that they feel that the pinky finally starts using its own power.
Paul
I forget the details, but I think I saw some anatomical paper that suggests Beauchamp is either wrong on that point or arguably a little careless with this wording. I'd have to find the source, but it seems that the two actions make sense separately but that it wouldn't work as lumbricals plus Interosseous in tandem. The source was from that clown keyboard class on the other forum, but it looked credible.
I agree almost entirely with your thumb idea, but just a few subtle differences here. I often like to actively point the thumb down very slightly. if I strive to dangle, my thumb is likely to come up. when it comes back and points down, it can have a huge effect on the poise of the 5th finger. also, it's possible to get the same effect on the keys, if it points down lightly against the key resistance. if freedom of the arm demands the thumb being dragged back, I have nothing against that at all and am regularly doing this. However, when this is just not possible, I can get equivalent effects as long as it's aiming slightly down.
for me this downward lengthening is the key. someone once told me to stop pulling my thumb back. he was wrong about that - as the real problem was coming back AND lifting up into alan's inversion. trying to keep the thumb on a key really can help with that- as it can create a goal of pointing down, in order to stay on the key. however, best of all, if the thumb knows to point down then you can stay in the keys or come back as you please. I think the concept of dangling is something that becomes possible in the later stages of development. however, if the hand encounters even mild instability, a relaxed thumb tends to reach up in order to (try to) aid balance. if you ensure that it reaches down a touch instead, this harmful instinct can be avoided. In my next blog post on effortless balance virtually every exercise will be related to triggering this style of thumb activity, in order to get another finger stable. I've found quite a few different tricks, since Alan showed me an exercise of taking the thumb across and touching it to the playing finger. I think it takes a fair amount of training the thumb to actively perform useful activities through this style of exercise, before intent for the thumb to be passive stops allowing it to rise up. my suspicion is that a dangling thumb may be an illusion that hides a tiny but vital action of lengthening out downwards, but even if literal, I think there's an important stage of activity before getting there. I'm still under doing it much of the time.