Figure 1.

Olfactory nerve stimulation triggers long-lasting LFP oscillations in theγ frequency range. A, Experimental scheme. ONL, Olfactory nerve layer; Stim., bipolar stimulating electrode located in the ONL, LFP, local field potential recording electrode placed at the border between the MCL and the EPL. B₁, Two individual traces illustrating LFP oscillations induced by olfactory nerve stimulation. The star indicates the stimulus onset, and the color dashed boxes indicate the parts of the signal used for the analysis in C and D. B₂, Expanded time scale of the sweeps presented in B₁. C, D, FFT (C) and autocorrelation (D) of the lower LFP signal in B₁ before (Before), just after (Stim.), and 3500 msec after (After) the stimulation onset. The mathematical functions were calculated over 200 msec rectangular time windows shown in B (same color code). E, Sliding autocorrelation of the bottom LFP trace in B revealing the long-lasting and highly periodic oscillation. The star indicates the stimulus onset. F, Distribution of the averaged oscillation frequencies across slices.