A segment of EEG can be decomposed into a plot of its power (usually in dB) as a function of frequency. This plot is termed the power spectrum. Because the spectrum captures only one instance in time it has limited utility during a dynamic anesthetic state (Fig. 11.3).
Taking the spectrum plots at several adjacent time intervals and stacking them together forms a 3D spectrogram. The spectrogram is a plot of power by frequency as a function of time.
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