Fig. 1.

Coherent activity between the motor cortex (MCx) and the pedunculopontine nucleus (PPN) is observed across different frequency ranges. A and B: power spectral density (PSD) of the cortical (A) and PPN (B) oscillatory activity shows an increase in the power of beta and gamma frequency bands in the MCx of rats that received a 6-hydroxydopamine (6-OHDA) lesion, which were not evident in the PPN. In turn, significant differences were observed in the theta-alpha bands in the PPN between conditions. C: the local field potentials of the MCx and PPN show 2 wide bands of coherent activity (measured by the squared coherence, Coh²) comprising the theta-alpha ranges and the beta-gamma ranges. These were significantly different between experimental conditions around 10 Hz. Data are depicted as means ± SE, blue traces for control animals, red for 6-OHDA. Shaded area depicts spectral regions where significant differences in power or coherence between control and 6-OHDA conditions were detected (see text).