Fig. 5.

Average firing rates of pallidal cells in the normal and parkinsonian state. A, Monkey H.B, Monkey I. Mean firing rates of well isolated cells and SEM are given in brackets. Error bars represent the SEM. Open bars are the mean firing rate of cells recorded in the normal state; black bars are after MPTP treatment. The bars on left are for GPe cells, bars in middle are for GPi cells, and bars on right are for border cells. The number of cells is given in Table 1. *Significant difference atp < 0.01, t test.