Figure 5.
Recovery of excitability after a stimulation period. After stopping the stimulation, neuronal excitability slowly recovers back to its maximal value. Recovery is shown after stimulation of duration 10, 30, and 100 s. Note that recovery is nonexponential, and that although excitability starts from the same value, the time course is different depending on the history. Defining a typical time for recovery by a fixed threshold, this time tR depends on history of stimulation and activity. Parameters: α0 [infi] = β = 20 Hz; σ = 0.1; cA = 1/2; stimulus frequency, 30 Hz.