PPM of the group of GPi neurons recorded in site p1d1. Parameters are estimated by using spike trains from the GPe neurons recorded in sites p1d1, p1d2 and p2d2 (where available) as history covariates. A, D) PPM parameters for 130Hz and 100Hz DBS respectively. B, E) KS plots for the PPMs with 95% confidence intervals for the models in A, D respectively. C, F) Z-scores of Peri Stimulus Time Histograms with 95% confidence intervals for the spiking of the GPi neurons used in the models A, D respectively.