kitarist -> RE: Video "Analyzing the Movements of Paco de Lucia's Technique"" (Apr. 29 2023 18:06:28)
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I am not very sure about the 3rd assumption, the middle joint movement, and since it cannot be distinguished when looking, the only way I agree with you, but we don't need to ask anyone to be certain it is not correct, since we know anatomy. First of all, joints don't have any power in any case; they are like pulleys with ropes, and the ropes are powered by flexor (and extensor) muscles in the forearm (there are two other muscles in the hand which both can aid the flexor superficialis pulling on the largest finger segment, but their main function is different). To first order, when we want to strike the string, the contracting flexor superficialis muscle puls a rope attached to the end of the first/largest finger segment and the rest of the finger goes along with it. The 'power', always comes from that, as if it is from the big joint - meaning the flexion of the largest finger segment towards the palm, bringing the rest of the finger segments with it with the most distal one going through the string. A second flexor - profundus, pulls a rope attached to the end of the middle finger segment - is aiding this, but cannot function as a sole or dominant force. To produce the appearance of only the middle joint functioning, something gets added to this - the extensor muscle firing to oppose the flexor superficialis to partially balance the apparent movement of the largest finger segment WHILE flexor profundus is still pulling the middle finger segment. This is possible because of how the two flexor tendons reach to different finger segments (see picture below). Even so, the largest finger segment is still pushing down hard to make a good stroke; we just have less apparent movement from it. It is impossible to just free-standing activate the flexor profundus without the extensor (+ flexor superficialis) - and if we could, trying to push through the string with picado/apoyando will just make our fingertip bounce over it, or if a free stroke, maybe pick the string upwards.
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