Figure 10.

An illustration of the parallel between how the size and shape of an object depend on where it is located (near versus far) relative to the observer, that is, the electrode detection surface. An individual is waiting on the edge of a curb to cross a three-lane highway (panel (A)), equipotential lines associated with a dipole (panel (B)), and the geometry of a propagating dipole detected by a point-electrode (panel (C)) are linked together in the analogy. In each panel, horizontal dotted lines indicate near and far observation distances of the target moving from left to right, which is a delivery van travelling in panel A and the muscle fiber action potential (MFAP) in the panels (B,C).