Figure 4.

Coherence and imaginary coherence analyses. A, Schematic drawing of the silicon probes position during simultaneous recordings in forelimb S1 and DLS. B, Raw LFP traces recorded in DLS and S1 (a single channel per shank is shown). C, Cortical LFP power spectra during run and baseline, for two rats. D, Average coherence spectra during run and baseline, for two rats. E, Schematic illustration of the two scenarios yielding a value of coherence close to 1: a stable phase coupling with non-zero phase difference and volume conduction. The imaginary part of the coherency, however, is different. F, Complex coherency values at 8 Hz for all the sessions of the two rats during run (n = 13 and 12 sessions). G, Averaged imaginary coherence during run and baseline. All graphs represent the average values across sessions ± SD. Shaded red area indicates the frequencies at which the power (C), the coherence (D) or the imaginary coherence (G) is significantly different in run compared to baseline.