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Prototype electrodes for experimental measurement of stimulation efficiency and selectivity. Photomicrographs of two sets of planar and cylindrical electrode designs for measuring the efficiency (left) and selectivity (right) of electrical stimulation in vivo. LHC = long hemicylinder, LC = long cylinder, and E = electrode. The standard electrode has the geometry of the contacts used in the Medtronic Model 3387 and 3389 arrays, and the Boston Scientific Vercise system array.
