Fig. 2

Analysis of gamma- and beta-frequency band LFP activity. (Left) Example 10*log(power) spectrogram (with window width 0.5 s, 0.25-s overlap and in 0.2-Hz intervals) showing averaged over 30 trials with 1-s pre-stimulus, 4-s whisker stimulation (indicated by the black bar) followed by 8-s recovery. Gamma (40–100 Hz) and beta (13–24 Hz) frequency bands are indicated. Note the marked increase in all frequencies at the onset of the stimulus at 1 s. (Right) Gamma- and beta-frequency bands averaged to show activity through the average trial. Again, note the increase in activity at the onset of the stimulation (grey box), which reduces to pre-stimulus levels by ~1 s into the stimulus