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Well, I don't know anything about acupuncture...
I did get an x-ray, and can tell you that the bones seperate at the first section. So, each thumb has two bones and one joint of it's own. The split is right at the base of where the side of my hand is (directly below the left side of my index finger). I have feeling in all parts... there are no dead-spots.
I can't use right-handed scissors very well with my left hand, because of how they are designed... the pressure you exert in the natural scissor-using posture keeps the blades together... if you use them in the wrong hand, it actually separates the blades as you cut, making it very difficult to cut anything. So, that also makes using lefties in the right hand impractical.
Xactos are fine, but I don't cut enough stuff to make it necessary. Most of my cutting is done with a mouse.
I am definitely Right-Handed. I am not skilled in much of anything with my left.
As for other tasks, having double thumbs seems mostly neutral. I don't have any great advantages... yeah, I can pick up one extra item when my hands are full... whoopdie-do... Sometimes, they come in handy while tying my shoes. The muscles are pretty strong, but i can't move each thumb independantly. I can barely bend them down, at all. I can pinch them together hard enough to draw blood (on someone else)... but i can't bend them.
I find that I use one thumb for some things, and the other thumb for other things... usually whichever one is closer, consideriing the task. For example, I use the inside thumb when writing, and the outside one to press the spacebar.
Kenneth
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