Fig. 2.

Raw spike trains, neuronal firing rates, and patterns in each nucleus and an example of cross-correlograms in a nontremulous patient. A, Examples of spike trains from two pairs of GPi neurons. In both examples, neurons were separated by 600 μm. Note that the lower pair of neurons displays oscillatory synchronization at ∼5 Hz. B, Mean firing rate and percentage of spikes in bursts (*p < 0.05; ANOVA on ranks) in the GPi, GPe, and SNr. C, Example of cross-correlograms from 20 GPi pairs recorded in a nontremulous patient [All correlograms were constructed using 5 msec bins, normalized to baseline firing rate and scaled to the 99% confidence interval (CI).]