Abstract
A theoretical method is described for estimating the distance between a spike recording-site, possibly axonal, and the corresponding cell body of unknown location. The method requires that an orthodromic spike be recorded following an antidromic spike, with estimation of a collision interval analogous to that used for establishing antidromicity. To calculate the distance between recording-site and cell body, values are needed for the collision interval between antidromic and succeeding orthodromic spkies, the refractory period of the spike, and the antidromic conduction speed. Problems may arise in determining the last value. The method is illustrated with antidromic spikes recorded in the medial thalamus of the cat upon stimulating the caudate nucleus.
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