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The + charges that are delivered into the axons depolarize the zone where the current exits the membrane. When the stimulus is made very strong, the depolarized zone extends further away from the end of the stimulating tube. The latency of the action potential then decreases, because the edge of the depolarized zone, where the impulse originates, moves further away from the end of the stimulating tube. The propagation distance thus becomes less. From the record, an estimate can be made of the distance the impulse origin moves away from the threshold locus.

 
 
Figure 24. Place of stimulation.

 
 
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