FIG. 6.

Summary of firing rate changes by region in response to LFS and HFS of STN. A: cumulative distributions of the neuronal firing rates in the 4 examined regions in the 3 conditions. Statistics from a 1-way ANOVA test whether stimulus frequency contributes to observed firing rate. B: the average firing rate changes across the populations of all neurons from a region for which HFS (top) or LFS (bottom) data were recorded. Symbols (diamonds and squares) report the mean; boxes cover the middle 2 quartiles split by a thin line denoting the median; thick lines stretch from 10th to 90th percentiles. Statistics from a 2-tailed pairwise t-test indicate that HFS increased firing rate in GPi and GPe, whereas LFS had no effect. Neither stimulus frequency affected firing rate in motor thalamus.