Fig. 4. Comparison of spontaneous and flash-induced bursts in frontal cortex under anesthesia with 1.9% isoflurane. (  A ) Color-coded plot of successive burst potentials from one experiment. Note the similarity of spontaneous (  left ) and flash-induced (  right ) bursts. The average waveforms from 80 burst are shown below each color plot. Average waveforms emphasize the short-latency (< 100 ms) potentials but diminish the long-latency (> 200 ms) components due to their increasing phase dispersion. Time zero is assigned to the initial large positive deflection in the signal. (  B ) Wavelet power spectra of all spontaneous (  left ) and flash-induced (  right ) bursts from the same experiment. Wavelet analysis reveals the long-latency signal power and allows the measurement of burst duration. (  C ) Average wavelet power from each of seven experiments. Spontaneous (  left ) and flash-induced (  right ) power curves from corresponding experiments are plotted in the same order to aid their comparison.