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Stimulus, excitability, and neural response. A stimulus (s; top) is delivered to the model neuron. Activity (a; bottom) is elicited in response to the stimulus, according to a nonlinear response function (see Fig. 3a), which depends on the internal excitability variable (X; middle). a, Periodic unit pulses of width 10 ms and period 40 ms. b, Random stimulus, uniformly distributed in [0,1]. Parameters: α0 = β = 20 Hz; σ = 0.1; cA = 1/2.
