For rats that underwent lidocaine inhibition of the nRE, coherence spectra between the HC and PFC local field potentials were calculated for all pairwise combinations between 2 PFC (left and right prelimbic area) and 4 HC (2 in dHC, 2 in vHC, on the right side) signals during RPO stimulations repeated before and after local nRE administration of lidocaine. Coherence was calculated on overlapping 4 s windows resulting in coherence spectra with 0.5 Hz resolution. Peak coherence values were identified in the delta and theta ranges at RPO stimulus intensities optimal for these oscillations, i.e. at low intensities for delta and at high intensities for theta oscillations generating the largest peaks in the power spectra (see Results).
