Fig. 4.

Lagged coherence and Fourier spectra of cortical activity over rat somatosensory cortex contain peaks in both the α- and the β-bands. A: the outline of 5 electrode arrays projected on a flattened brain map. B: for rat 1 (green outline in A), we show the lagged coherence spectrum between 4 and 40 Hz at each electrode location. The 25% electrodes that together make up the α-site are depicted in blue; the 25% electrodes that make up the β-site are depicted in green. Electrodes that are in both groups are depicted in black. C: the lagged coherence spectra of rat 1 are plotted separately for the α- and the β-site. D: the lagged coherence spectra at the α-sites are shown for each animal, and for all animals averaged (thick black line). The spectra in C are shown again in D and E, but now in red. E: same as D, but now the lagged coherence spectra are shown for the β-sites. F–H: same as C–E, but showing Fourier amplitude spectra.