Multitaper Spectrogram Sleep Stage Patterns (image) Massachusetts General Hospital Share Print E-Mail Caption The sleep EEG multitaper spectrogram reveals patterns of continuous changes in brain oscillation activity during sleep. Characteristic patterns clearly differentiate waking (left) from nonREM (center) and REM sleep (left). Credit Michael Prerau, PhD Usage Restrictions Usage restricted to coverage of the research described in this release. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.