Certain input—output relations were studied by-way of intraneuronal recordings in isolated visceral ganglia of Aplysia californica. All cells exhibited a prolonged sequence of excitatory postsynaptic potentials (EPSP's) of a single type and, as a consequence, produced recurrent spikes. EPSP's either (i) occurred "spontaneously" or (ii) were initiated by stimulating a connective with shocks from a stimulator driven by a Geiger counter. The prespike epoch was analyzed and the events that trigger the postsynaptic spike were identified in a probabilistic manner. Experiments in digital—computer—simulated neurons reproduced and extended the results of animal experiments.
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