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. Author manuscript; available in PMC: 2017 Apr 10.
Published in final edited form as: J Neural Eng. 2016 Jan 20;13(2):021001. doi: 10.1088/1741-2560/13/2/021001

Figure 2.

Figure 2

The three scenarios outlined by Shannon for electrode–tissue interaction as a function of distance between a disk electrode and excitable tissue, relative to the electrode diameter. In the near-field case (A), non-uniform current density at the electrode circumference is postulated to contribute to tissue damage; in the mid-field case (B) the current density is lower and more uniform; and, in the far-field case (C) the electrode acts as a point source in which the current uniformity and density at the electrode are not factors affecting tissue damage.