Figure 2.

Phase response curve for a type I excitatory and inhibitory neuron representing the phase change in the spiking response of the neuron to a depolarizing pulse, as a function of the phase of the input (normalized to the spiking period T₀ of the neuron). The excitatory (inhibitory) neuron is spiking tonically at an unperturbed period of 8.09 ms (6.00 ms), and receives the injection of a pulse with amplitude 1.0 nA and duration 0.2 ms. The PRCs, obtained with the XPPAUT software (Ermentrout, 2002), are defined as 1 − T(τ)/T_o, where T(τ) is the period after perturbing at time τ.