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Originally Posted by Chris K I beg to differ with Fergie here since with correct floating thumb technique the body contour does not play any role whatsoever, because the arm is supposed to move along the front of the body only. |
Sorry for any mis-understanding here. I mention the contours on basses only in the context that they encourage the forearm to lean on the bass, rather than along the front of it. Basses with straighter edges, like semi acoustic archtops, will let the player know if they lean on the instrument, especially if the arm is bare. As you mention it is a "watch point" in a floating thumb technique that the forearm remains more to the front to allow the elbow to move the hand.
For anyone confused about this position let me explain.
The hands ability to move up and down gives the fingers the ability to access all the strings. This action is controlled by the elbow, it is the hinge in the elbow that allows the forearm to move up and down, and by virtue of body mechanics, the hand being connected to the end of the forearm, after the wrist joint, must move up and down with it as well. The fact the fingers are on the end of the hand, they also must move up and down as well. All this action is positioned by the upper arm and shoulder, even though many don't think it features in the action, the shoulder is the main support for any action that the hands supply.
The fingers can be interfered/inhibited with in relation to power and movement anywhere along the pathline from the neck through the shoulder-upper arm-forearm-hand-fingers. The fingers are an easy target to mis-diagnose problems because any problems along the pathline will show in the fingers. So a problem in the forearm can show symptoms in the fingers, as can a problem in the neck show symptoms in the fingers.
Think of it as a hose conected to a tap, if the water flow is disrupted it shows at the end in the hose nozzle depending on what the disruption is. It may be reduced flow, spurting flow, no flow etc. But looking at the hose nozzle for the problem may not be the answer, unless it is a obvious fault in the nozzle. The problem can be anywhere along the pathline from the tap to the hose nozzle.
The nozzle only shows the effect of the fault, it may have nothing to do with the fault.
This is also true in the body and is called a reffered symptom or pain, the area of problem is highlighting a problem from somewhere different. Because the fingertips have concentrated nerve endings to sense touch, cold, heat, pressure etc, they will pick up on any nerve problems along the pathway from the brain.
It is a complicated and facinating subject how body mechanics work in relation to ones playing, this is just a small part of it.