Quote:
Robert M Watson Jr wrote:
Hi Erick,
Do the twist but do not move the upper arm and as the radius and ulna twist the hand moves ~1/2 inch from the wall. Does this still illustrate your point without the need to include the shoulder?
Thanks
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Yes, but as in my response to Ahmad it is more comprehensive than the arms -- it is the whole body. It seems like a very short actuation, but it sums over the whole length of the structure (to the ground, I suppose
) as long as there are no kinks or discontinuities. Kinks or discontinuities create points of incipient collapse. Those are often compensated by actuating a counter-leverage to stablize, which creates adverse shear, which creates the need for more counter- leverage -- well, you get the picture. Trick is to compensate by the same mechanism and NOT to let leverage come into play. Most days, most ways I get it -- but then I'll get caught out in the odd point ...
And dynamically the length of actuation is not the key -- but the reflexive sharpness and, even more critically, the sensitivity of the more guided applications of the action, Since it is tactile in sense and in action -- no mind is really involved in doing it, just a feel that is also the action being felt -- and therfore very tightly recursive in neuro-muscular terms.