Fig. 2.

Characteristics of 4–6 Hz band, βFB, and non-oscillatory neurons in the GPi. a Patterns of three neurons with 4–6 Hz band, βFB, and non-oscillation. b ISI histograms of three neurons and their MSFR of 76.1 Hz, 93.9 Hz and 69.6 Hz. c Power density spectrum of the three neurons at peak power of 5.5 Hz, 28 Hz, and no power. d Autocorrelation histograms of three patterns of oscillatory neurons; e An example of GPi 4–6 Hz band oscillatory neurons and its coherence with limb tremor. The top trace shows raw data of a 4–6 Hz band oscillatory neuron that corresponds to the limb tremor; below shows spectral analysis of 4–6 Hz band oscillatory neuron, limb tremor of FCR, and 4–6 Hz band neuron x FCR, which is the coherence between them. Horizontal line indicates a significant coherent level at 0.42 (p < 0.05). f Comparisons of MSFR, CV and percentages of 4–6 Hz band, βFB oscillatory neurons and non-oscillatory neurons; G. Histogram demonstrates MSFR of total GPi neurons