Figure 7. The effects of channel noise upon sub-threshold and graded voltage signals.

A. The standard deviation of the voltage of the spiking neuron model (stochastic voltage-gated Na⁺ and K⁺ channels), a modified model with stochastic voltage-gated Na⁺ and deterministic voltage-gated K⁺ channels, a modified model with deterministic voltage-gated Na⁺ and stochastic voltage-gated K⁺ channels, and the graded neuron model (stochastic voltage-gated K⁺ channels) over a 16 mV range of holding potentials. B. Shannon information rates of all four models shown in A evoked by low mean, high standard deviation current stimuli at sub-threshold holding potentials. C. Coherence-based information rates of all four models shown in A evoked by low mean, high standard deviation current stimuli at sub-threshold holding potentials. D. Normalized mean square error (nRMSE) information rates of all four models shown in A evoked by low mean, high standard deviation current stimuli at sub-threshold holding potentials.