Inhibition enhances the coherence in the Jacobi neuronal model.

•The dependence of the noise in the Jacobi neuronal model on the rate of inhibition generates non trivial behavior of some measures of spike variability.•The degree of coherence computed from the power spectrum can increase with the rate of inhibition.•Enhanced coherence is observed for values of the parameters corresponding to a maximum in the diffusion coefficient with respect to the inhibitory rate.