Convergence of GPe neuron conductance barrage on SNr neurons. A, Synaptic current oscillatory peak spectra of 4 GPe neurons from the recorded sample with similar firing rates, calculated using a 15 mV synaptic driving force. Dashed lines indicate the cells’ spontaneous firing rates. B, Synaptic current oscillatory peak spectrum for the convergence of the 4 neurons. C, Peak spectra for a second group of 4 GPe neurons representing a broader range of firing rates. D, Peak spectrum for the combined synaptic currents of the subset shown in B.