Prefrontal EEG spectra
To evaluate the intra-operative effect of subanesthetic s-ketamine, we exhibited the full-range EEG median spectrograms of saline and s-ketamine groups (Fig. Spectral analysis of EEG signals before and after the administration of s-ketamine. During the recovery period after the cessation of sevoflurane, the power and peak frequency showed no differences between two groups. The power of gamma oscillations gradually increased and then declined after recovery of consciousness (Fig. The characteristics of prefrontal EEG signals across anesthesia recovery states. The dynamic changes of gamma power (