Figure 4.

Probability of yes output spike indications (one or more output pulses) registered by a secondary coincidence in a 1/10-s interval for a neuron fed by 25, 50, and 100 primary neurons with pulse lengths of 5 ms and 10 ms. The threshold is set to generate 50% yes indications for primary counting rates of 30 pps. The curves represent the best least-squares fit to sigmoid functions described in the text to points generated through Monte Carlo calculations. The points are shown for the 50-counter results with a 10-ms pulse length to suggest the quality of the fit to the points.