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Modeling the rate of depolarization (ROD) threshold. If the threshold adapts to the input signal, for slow depolarization (A) the threshold will track the input and no spike will be fired. If depolarization is fast enough (B), the threshold will not have time to track the input and a spike will be fired. In this example, the step goes from 0.2 mV to 15 mV at different speeds. The relevant model parameters are a = 3, τ = 2 ms, α = 1, β = 1, and r = 1 ms.
