The little finger of my left hand (aka L4) exhibits a variety of superfluous maneuvers when the other three fingers move. Jerking, sudden tension, extension, flexing, etc. Sometimes the motions are in the same direction as the other fingers, and sometimes in the opposite direction.
The other fingers do this too, but L4 is especially prolific. I wonder whether physiology might shed light on the origin of this. Are the motions neurological in origin? For example, are there shared nerves or ganglions between L4 and the other three fingers? Are they mechanical in origin? Are L4's unnecessary motions due to stress from sharing tendons and/or muscles with the other three fingers? Are they psychological in origin? Perhaps a jerky L4 is body language for "I'm confused and I feel insecure."? To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html
