Here's a lovely resource for those wishing to understand finger movement: https://www.mech.utah.edu/senior_design/05/uploads/RoboticHand/Jared_research.pptIt says:1) EDC: mainly extends P1, but partially extends P2; could only extend P3 if it were to detach from P1Interossei: with EDC contracted, interossei extend P2, P3Or in other words the interossei can't extend in isolation - they extend the middle and nail joint only if the finger extensors (in the arm) are extending the knuckle joint at the same time. Seems rather unwieldy for piano playing.They can flex the finger on their own though:2) Interossei: when EDC is relaxed, interossei flex P1 (enhanced by incorporation of interosseous hood which raps around P1) and thank you for keeping it short!
So what you're saying is that we shouldn't consciously isolate a muscle group that the brain has no capacity to consciously isolate?
Also, that appears to be taken totally out of context. Nobody said to isolate the intrinsic muscles. they can be used in tandem with other groups.
That sentence doesn't seem to say anything. To extend, as you wish to do, they must 'be used in tandem with other groups'. Your wish to use the intrinsic muscles to extend just seems rather inefficient. P1 is the part of the finger that starts at the knuckle. P2 the middle part,P3 the nail.
We do not consciously control the individual ingredients but merely the resulting blend. The rest is purely a mild intellectual curiosity to me.
Whose talkin' 'conscious control' here?
That's why I steer well clear of basing explanations on muscle groups and instead deal with physical qualities of actions.
Fine, as I said in the OP 'I notice a poster advocating using more intrinsic muscles when using the fingers.' - his/her terminology. Perhaps you'd like to express your views to them? Meanwhile, changing the shape of your finger/ not changing the shape of your finger as the key goes down is under conscious control. Perhaps you'd rather frame the discussion that way? Unfortunately though, the evidence is in 'grownup' talk.
Yes, but bending, fixing or extending the fingers will have consequences. And that we will.
To be honest you only seem to 'steer well clear' when you're shown to be in error! The interosseous muscles mostly flex the P1, not extend.
Though you don't give a damn, I believe from Beachamp you mean this:'This action of the fingers — similar to writing, or (as many of the anatomy books say) to threading a needle — uses the interosseous and lumbrical muscles, which flex the fingers at their first knuckles (metacarpophalangeal joints) and extend simultaneously at the second and third (proximal and distal interphalangeal joints),'The extension referred to as by the interosseous can only occur once the metacarpophalangeal joint is in extension - not a very useful position for playing. The lumbricals can do what he wants but it's pretty subtle - Tubiana describes them as feeble.
For instance, I have a question I've never found the answer to and that is: since the lumbrical muscles --unlike all other muscles in the body -- are connected to tendons instead of bone, specifically the flexor digitorum profundus and the extensor expansions, the "FDP" being your subject, I believe, which manipulates the finger tip joint... it seems to me that when the lumbricals are used by means of movement that employs them, that the FDP is also engaged by virtue of the fact that the contracting lumbrical is therefore pulling against the FDP's tendon.
Sorry there's no point discussing anatomy with someone who won't use 'jargon' - I've no idea how to begin.
Obviously. So why not discuss that, rather than waste even a moment of time on irrelevant jargon that has no consequences?
If you want to stay in this discussion you're going to have to stipulate which is 'irrelevant jargon' and which is 'relevant jargon'. It's all too confusing for me. For instance is interosseous 'irrelevant jargon'? is lumbricals? is intrinsic? Tell me what terms are relevant to you, and what are not, and maybe we could get somewhere.
How do you know it's not the extensors lengthening? whilst the interosseous part the fingers?
Are you saying because you use your interosseous muscles to make space between your fingers the fingers don't preserve their shape?? Otherwise, I'm not sure how you're approaching the OT.
No. I am saying I definitely use the interosseus muscles and that my finger definitely changes shape-
In that case I think a study of the anatomy would conclude you're using the interosseus to 'space' your fingers whilst changing their shape principally using the extensors.
Nobody argued otherwise at stage. Why would I-given that it has no practical relevance? That said, why do you assume they do not contribute at the knuckle too? I see nothing to exclude that likelihood from any of your sources.
If you read the jpg you'll learn they (interosseous) flex the knuckle. Still that's only Tubiana, one of the world's top hand surgeons. Who's he compared to Mr Beauchamp and his blog?
Which brings me back to the OT - you can fix the finger shape (static flexors) and use the interosseous to flex the knuckle. It's the more common articulation in use. Of course all groups lend a hand (Oh a joke!) in reality. It's really more a matter of bias.
Why is a rigid finger sliding across a key desirable? And you didn't say"can". You falsely portrayed it as the only way that is possible when using interosseus. It's neither the only way nor desirable.
Well, I can't say I've seen it much in action.
The motion would be as if you pushed a piece of paper across a table to your friend (without using your arm, only fingers). See how your fingers kinda flick upwards? On the piano, it will sound like mini-staccatos.
It's seems even rarer than the pulling the fingertip in.
I didn't say it was 'desirable' I said it was the most common. It is by far the most common way of using the interosseous - your way is quite rare.
Secondary:• Assists in flexion of the metacarpal-phalangeal joints and extension of the interphalangeal joints of the respective finger.
@ajs CPE Bach talks about two touches - caressing (clavichord) and attacking (harpsichord). These are the two touches I refer to in the OT. (Quite what is the point of the poster above hijacking the thread into a treatise on a third touch is beyond me.)
Hard cheese. It was good enough for Beethoven.
The only person it's hard cheese for is you- with the abysmal standard of playing that you achieved by taking texts aimed at different instruments as being "rules" for piano playing.
Your own peculiar form of sour grapes I assume?
p3kmw&index=5