Fig. 7.

CN spike rate increases for a wide range of input spike rates and dependence of the STD effect on the convergence ratio. a Effect of input irregularity on the CN neuron model at different firing rates of the Purkinje cell inputs in the presence (a ₁) and absence (a ₂) of STD (convergence ratio = 90). b STD-dependent relative increase of the CN neuron spike rate ((STD_ON–STD_OFF)/STD_OFF) for different convergence ratios (at a Purkinje cell spike rate of 60 Hz). The STD dependence of the irregularity driven spike rate increase is diminished for low-convergence ratios