Figure 4.

Responses of the new model without (A) and with (B) persistent sodium channels to a linearly rising current; (C) the latencies of the threshold responses for the models without (bold line) and with (thin line) persistent sodium channels. In subfigures (A) and (B) the responses for each model are shown for increasing stimulus intensities: A) 0.950, 0.975, 1.00, and 1.025 excitation threshold, and B) 0.925, 0.950, 0.975, and 1.00 excitation threshold. Threshold responses are drawn with bold lines.