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Published online by Cambridge University Press: 01 January 2025
Conditions are determined under which a single self-exciting neuron can reach a state of permanent excitation, in the case that the neuron develops both an excitatory and an inhibitory substance as well as in the case that it develops only a single, excitatory substance. In case both substances are developed it is possible to have periodic solutions, a possibility which does not arise when the circuit consists of neurons, or of a neuron, developing only an excitatory substance.
In the figures we introduce a dot to represent the nucleus so that all impulses on one side of the nucleus travel toward it (dendrites), and on the other side away from it (axons or their collaterals). In complex circuits this convention may be especially useful.