Figure 12
From: Classification of the extracellular fields produced by activated neural structures
Plot of the power spectrum of extracellular fields generated by an action potential propagating along an axon as a function of distance, R, from the axon. It is assumed that the potential moves with a velocity of 40 meters/second and that the length of activated neuron is 6 mm. The maximum frequency for which there is significant power clearly declines as the distance between the axon and the recording electrode increases.