The Potential Around Electrode Tips: Model Considerations

Abstract

SUMMARY

As a new approach we considered the time and frequency depending electrical properties of biological material. Our model shows that in the near field around an electrode tip (distance < 15 μm) the spread of potential differs significantly from a model which denies time and frequency dependence of the biological material. On the other hand this effect decreases in the far-field (distance > 20 μm) due to the low-pass filtering characteristic of biological material. Furthermore it can be seen that the distortion of the signal in the near-field of an electrode tip depends on the inner resistance of the stimulus generator: current sources distort much more than voltage sources.